FileUtils.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.io;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.UncheckedIOException;
import java.math.BigInteger;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.charset.UnsupportedCharsetException;
import java.nio.file.CopyOption;
import java.nio.file.DirectoryStream;
import java.nio.file.FileVisitOption;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.NotDirectoryException;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import java.time.Duration;
import java.time.Instant;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.OffsetTime;
import java.time.ZoneId;
import java.time.chrono.ChronoLocalDate;
import java.time.chrono.ChronoLocalDateTime;
import java.time.chrono.ChronoZonedDateTime;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;
import java.util.zip.Checksum;
import org.apache.commons.io.file.AccumulatorPathVisitor;
import org.apache.commons.io.file.Counters;
import org.apache.commons.io.file.PathFilter;
import org.apache.commons.io.file.PathUtils;
import org.apache.commons.io.file.StandardDeleteOption;
import org.apache.commons.io.filefilter.FileEqualsFileFilter;
import org.apache.commons.io.filefilter.FileFileFilter;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.SuffixFileFilter;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.commons.io.function.IOConsumer;
import org.apache.commons.io.function.Uncheck;
/**
* General file manipulation utilities.
* <p>
* Facilities are provided in the following areas:
* </p>
* <ul>
* <li>writing to a file
* <li>reading from a file
* <li>make a directory including parent directories
* <li>copying files and directories
* <li>deleting files and directories
* <li>converting to and from a URL
* <li>listing files and directories by filter and extension
* <li>comparing file content
* <li>file last changed date
* <li>calculating a checksum
* </ul>
* <p>
* Note that a specific charset should be specified whenever possible. Relying on the platform default means that the
* code is Locale-dependent. Only use the default if the files are known to always use the platform default.
* </p>
* <p>
* {@link SecurityException} are not documented in the Javadoc.
* </p>
* <p>
* Provenance: Excalibur, Alexandria, Commons-Utils
* </p>
*/
public class FileUtils {
/**
* The number of bytes in a kilobyte.
*/
public static final long ONE_KB = 1024;
/**
* The number of bytes in a kilobyte.
*
* @since 2.4
*/
public static final BigInteger ONE_KB_BI = BigInteger.valueOf(ONE_KB);
/**
* The number of bytes in a megabyte.
*/
public static final long ONE_MB = ONE_KB * ONE_KB;
/**
* The number of bytes in a megabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_MB_BI = ONE_KB_BI.multiply(ONE_KB_BI);
/**
* The number of bytes in a gigabyte.
*/
public static final long ONE_GB = ONE_KB * ONE_MB;
/**
* The number of bytes in a gigabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_GB_BI = ONE_KB_BI.multiply(ONE_MB_BI);
/**
* The number of bytes in a terabyte.
*/
public static final long ONE_TB = ONE_KB * ONE_GB;
/**
* The number of bytes in a terabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_TB_BI = ONE_KB_BI.multiply(ONE_GB_BI);
/**
* The number of bytes in a petabyte.
*/
public static final long ONE_PB = ONE_KB * ONE_TB;
/**
* The number of bytes in a petabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_PB_BI = ONE_KB_BI.multiply(ONE_TB_BI);
/**
* The number of bytes in an exabyte.
*/
public static final long ONE_EB = ONE_KB * ONE_PB;
/**
* The number of bytes in an exabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_EB_BI = ONE_KB_BI.multiply(ONE_PB_BI);
/**
* The number of bytes in a zettabyte.
*/
public static final BigInteger ONE_ZB = BigInteger.valueOf(ONE_KB).multiply(BigInteger.valueOf(ONE_EB));
/**
* The number of bytes in a yottabyte.
*/
public static final BigInteger ONE_YB = ONE_KB_BI.multiply(ONE_ZB);
/**
* An empty array of type {@link File}.
*/
public static final File[] EMPTY_FILE_ARRAY = {};
/**
* Returns a human-readable version of the file size, where the input represents a specific number of bytes.
* <p>
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is rounded down to the
* nearest GB boundary.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @throws NullPointerException if the given {@link BigInteger} is {@code null}.
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
* @since 2.4
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(final BigInteger size) {
Objects.requireNonNull(size, "size");
final String displaySize;
if (size.divide(ONE_EB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = size.divide(ONE_EB_BI) + " EB";
} else if (size.divide(ONE_PB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = size.divide(ONE_PB_BI) + " PB";
} else if (size.divide(ONE_TB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = size.divide(ONE_TB_BI) + " TB";
} else if (size.divide(ONE_GB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = size.divide(ONE_GB_BI) + " GB";
} else if (size.divide(ONE_MB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = size.divide(ONE_MB_BI) + " MB";
} else if (size.divide(ONE_KB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = size.divide(ONE_KB_BI) + " KB";
} else {
displaySize = size + " bytes";
}
return displaySize;
}
/**
* Returns a human-readable version of the file size, where the input represents a specific number of bytes.
* <p>
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is rounded down to the
* nearest GB boundary.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(final long size) {
return byteCountToDisplaySize(BigInteger.valueOf(size));
}
/**
* Returns a human-readable version of the file size, where the input represents a specific number of bytes.
* <p>
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is rounded down to the
* nearest GB boundary.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
* @since 2.12.0
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(final Number size) {
return byteCountToDisplaySize(size.longValue());
}
/**
* Requires that the given {@link File} object
* points to an actual file (not a directory) in the file system,
* and throws a {@link FileNotFoundException} if it doesn't.
* It throws an IllegalArgumentException if the object points to a directory.
*
* @param file The {@link File} to check.
* @param name The parameter name to use in the exception message.
* @throws FileNotFoundException if the file does not exist
* @throws NullPointerException if the given {@link File} is {@code null}.
* @throws IllegalArgumentException if the given {@link File} is not a file.
*/
private static void checkFileExists(final File file, final String name) throws FileNotFoundException {
Objects.requireNonNull(file, name);
if (!file.isFile()) {
if (file.exists()) {
throw new IllegalArgumentException("Parameter '" + name + "' is not a file: " + file);
}
if (!Files.isSymbolicLink(file.toPath())) {
throw new FileNotFoundException("Source '" + file + "' does not exist");
}
}
}
private static File checkIsFile(final File file, final String name) {
if (file.isFile()) {
return file;
}
throw new IllegalArgumentException(String.format("Parameter '%s' is not a file: %s", name, file));
}
/**
* Computes the checksum of a file using the specified checksum object. Multiple files may be checked using one
* {@link Checksum} instance if desired simply by reusing the same checksum object. For example:
*
* <pre>
* long checksum = FileUtils.checksum(file, new CRC32()).getValue();
* </pre>
*
* @param file the file to checksum, must not be {@code null}
* @param checksum the checksum object to be used, must not be {@code null}
* @return the checksum specified, updated with the content of the file
* @throws NullPointerException if the given {@link File} is {@code null}.
* @throws NullPointerException if the given {@link Checksum} is {@code null}.
* @throws IllegalArgumentException if the given {@link File} is not a file.
* @throws FileNotFoundException if the file does not exist
* @throws IOException if an IO error occurs reading the file.
* @since 1.3
*/
public static Checksum checksum(final File file, final Checksum checksum) throws IOException {
checkFileExists(file, "file");
Objects.requireNonNull(checksum, "checksum");
try (InputStream inputStream = new CheckedInputStream(Files.newInputStream(file.toPath()), checksum)) {
IOUtils.consume(inputStream);
}
return checksum;
}
/**
* Computes the checksum of a file using the CRC32 checksum routine.
* The value of the checksum is returned.
*
* @param file the file to checksum, must not be {@code null}
* @return the checksum value
* @throws NullPointerException if the given {@link File} is {@code null}.
* @throws IllegalArgumentException if the given {@link File} does not exist or is not a file.
* @throws IOException if an IO error occurs reading the file.
* @since 1.3
*/
public static long checksumCRC32(final File file) throws IOException {
return checksum(file, new CRC32()).getValue();
}
/**
* Cleans a directory without deleting it.
*
* @param directory directory to clean
* @throws NullPointerException if the given {@link File} is {@code null}.
* @throws IllegalArgumentException if directory does not exist or is not a directory.
* @throws IOException if an I/O error occurs.
* @see #forceDelete(File)
*/
public static void cleanDirectory(final File directory) throws IOException {
IOConsumer.forAll(FileUtils::forceDelete, listFiles(directory, null));
}
/**
* Cleans a directory without deleting it.
*
* @param directory directory to clean, must not be {@code null}
* @throws NullPointerException if the given {@link File} is {@code null}.
* @throws IllegalArgumentException if directory does not exist or is not a directory.
* @throws IOException if an I/O error occurs.
* @see #forceDeleteOnExit(File)
*/
private static void cleanDirectoryOnExit(final File directory) throws IOException {
IOConsumer.forAll(FileUtils::forceDeleteOnExit, listFiles(directory, null));
}
/**
* Tests whether the contents of two files are equal.
* <p>
* This method checks to see if the two files are different lengths or if they point to the same file, before
* resorting to byte-by-byte comparison of the contents.
* </p>
*
* @param file1 the first file
* @param file2 the second file
* @return true if the content of the files are equal or they both don't exist, false otherwise
* @throws IllegalArgumentException when an input is not a file.
* @throws IOException If an I/O error occurs.
* @see PathUtils#fileContentEquals(Path,Path)
*/
public static boolean contentEquals(final File file1, final File file2) throws IOException {
if (file1 == null && file2 == null) {
return true;
}
if (file1 == null || file2 == null) {
return false;
}
final boolean file1Exists = file1.exists();
if (file1Exists != file2.exists()) {
return false;
}
if (!file1Exists) {
// two not existing files are equal
return true;
}
checkIsFile(file1, "file1");
checkIsFile(file2, "file2");
if (file1.length() != file2.length()) {
// lengths differ, cannot be equal
return false;
}
if (file1.getCanonicalFile().equals(file2.getCanonicalFile())) {
// same file
return true;
}
return PathUtils.fileContentEquals(file1.toPath(), file2.toPath());
}
/**
* Compares the contents of two files to determine if they are equal or not.
* <p>
* This method checks to see if the two files point to the same file,
* before resorting to line-by-line comparison of the contents.
* </p>
*
* @param file1 the first file
* @param file2 the second file
* @param charsetName the name of the requested charset.
* May be null, in which case the platform default is used
* @return true if the content of the files are equal or neither exists,
* false otherwise
* @throws IllegalArgumentException when an input is not a file.
* @throws IOException in case of an I/O error.
* @throws UnsupportedCharsetException If the named charset is unavailable (unchecked exception).
* @see IOUtils#contentEqualsIgnoreEOL(Reader, Reader)
* @since 2.2
*/
public static boolean contentEqualsIgnoreEOL(final File file1, final File file2, final String charsetName)
throws IOException {
if (file1 == null && file2 == null) {
return true;
}
if (file1 == null || file2 == null) {
return false;
}
final boolean file1Exists = file1.exists();
if (file1Exists != file2.exists()) {
return false;
}
if (!file1Exists) {
// two not existing files are equal
return true;
}
checkFileExists(file1, "file1");
checkFileExists(file2, "file2");
if (file1.getCanonicalFile().equals(file2.getCanonicalFile())) {
// same file
return true;
}
final Charset charset = Charsets.toCharset(charsetName);
try (Reader input1 = new InputStreamReader(Files.newInputStream(file1.toPath()), charset);
Reader input2 = new InputStreamReader(Files.newInputStream(file2.toPath()), charset)) {
return IOUtils.contentEqualsIgnoreEOL(input1, input2);
}
}
/**
* Converts a Collection containing {@link File} instances into array
* representation. This is to account for the difference between
* File.listFiles() and FileUtils.listFiles().
*
* @param files a Collection containing {@link File} instances
* @return an array of {@link File}
*/
public static File[] convertFileCollectionToFileArray(final Collection<File> files) {
return files.toArray(EMPTY_FILE_ARRAY);
}
/**
* Copies a whole directory to a new location, preserving the file dates.
* <p>
* This method copies the specified directory and all its child directories and files to the specified destination.
* The destination is the new location and name of the directory. That is, copying /home/bar to /tmp/bang
* copies the contents of /home/bar into /tmp/bang. It does not create /tmp/bang/bar.
* </p>
* <p>
* The destination directory is created if it does not exist. If the destination directory does exist, then this
* method merges the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However it is
* not guaranteed that the operation will succeed. If the modification operation fails, it falls back to
* {@link File#setLastModified(long)}. If that fails, the method throws IOException.
* </p>
* <p>
* Symbolic links in the source directory are copied to new symbolic links in the destination
* directory that point to the original target. The target of the link is not copied unless
* it is also under the source directory. Even if it is under the source directory, the new symbolic
* link in the destination points to the original target in the source directory, not to the
* newly created copy of the target.
* </p>
*
* @param srcDir an existing directory to copy, must not be {@code null}.
* @param destDir the new directory, must not be {@code null}.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if {@code srcDir} exists but is not a directory,
* the source and the destination directory are the same
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if an error occurs, the destination is not writable, or setting the last-modified time didn't succeed
* @since 1.1
*/
public static void copyDirectory(final File srcDir, final File destDir) throws IOException {
copyDirectory(srcDir, destDir, true);
}
/**
* Copies a whole directory to a new location.
* <p>
* This method copies the contents of the specified source directory to within the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist. If the destination directory does exist, then this
* method merges the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> Setting {@code preserveFileDate} to {@code true} tries to preserve the files' last
* modified date/times using {@link File#setLastModified(long)}. However it is not guaranteed that those operations
* will succeed. If the modification operation fails, the method throws IOException.
* </p>
*
* @param srcDir an existing directory to copy, must not be {@code null}.
* @param destDir the new directory, must not be {@code null}.
* @param preserveFileDate true if the file date of the copy should be the same as the original.
* @throws IllegalArgumentException if {@code srcDir} exists but is not a directory, or
* the source and the destination directory are the same
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if an error occurs, the destination is not writable, or setting the last-modified time didn't succeed
* @since 1.1
*/
public static void copyDirectory(final File srcDir, final File destDir, final boolean preserveFileDate)
throws IOException {
copyDirectory(srcDir, destDir, null, preserveFileDate);
}
/**
* Copies a filtered directory to a new location preserving the file dates.
* <p>
* This method copies the contents of the specified source directory to within the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist. If the destination directory does exist, then this
* method merges the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the files' last modified date/times using
* {@link File#setLastModified(long)}. However it is not guaranteed that those operations will succeed. If the
* modification operation fails, the method throws IOException.
* </p>
* <b>Example: Copy directories only</b>
*
* <pre>
* // only copy the directory structure
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY);
* </pre>
*
* <b>Example: Copy directories and txt files</b>
*
* <pre>
* // Create a filter for ".txt" files
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
*
* // Create a filter for either directories or ".txt" files
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
*
* // Copy using the filter
* FileUtils.copyDirectory(srcDir, destDir, filter);
* </pre>
*
* @param srcDir an existing directory to copy, must not be {@code null}.
* @param destDir the new directory, must not be {@code null}.
* @param filter the filter to apply, null means copy all directories and files should be the same as the original.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if {@code srcDir} exists but is not a directory, or
* the source and the destination directory are the same
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if an error occurs, the destination is not writable, or setting the last-modified time didn't succeed
* @since 1.4
*/
public static void copyDirectory(final File srcDir, final File destDir, final FileFilter filter)
throws IOException {
copyDirectory(srcDir, destDir, filter, true);
}
/**
* Copies a filtered directory to a new location.
* <p>
* This method copies the contents of the specified source directory to within the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist. If the destination directory does exist, then this
* method merges the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> Setting {@code preserveFileDate} to {@code true} tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is
* not guaranteed that the operation will succeed. If the modification operation fails it falls back to
* {@link File#setLastModified(long)}. If that fails, the method throws IOException.
* </p>
* <b>Example: Copy directories only</b>
*
* <pre>
* // only copy the directory structure
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY, false);
* </pre>
*
* <b>Example: Copy directories and txt files</b>
*
* <pre>
* // Create a filter for ".txt" files
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
*
* // Create a filter for either directories or ".txt" files
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
*
* // Copy using the filter
* FileUtils.copyDirectory(srcDir, destDir, filter, false);
* </pre>
*
* @param srcDir an existing directory to copy, must not be {@code null}.
* @param destDir the new directory, must not be {@code null}.
* @param filter the filter to apply, null means copy all directories and files.
* @param preserveFileDate true if the file date of the copy should be the same as the original.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if {@code srcDir} exists but is not a directory,
* the source and the destination directory are the same, or the destination is not writable
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @since 1.4
*/
public static void copyDirectory(final File srcDir, final File destDir, final FileFilter filter, final boolean preserveFileDate) throws IOException {
copyDirectory(srcDir, destDir, filter, preserveFileDate, StandardCopyOption.REPLACE_EXISTING, LinkOption.NOFOLLOW_LINKS);
}
/**
* Copies a filtered directory to a new location.
* <p>
* This method copies the contents of the specified source directory to within the specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist. If the destination directory does exist, then this
* method merges the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> Setting {@code preserveFileDate} to {@code true} tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is
* not guaranteed that the operation will succeed. If the modification operation fails it falls back to
* {@link File#setLastModified(long)}. If that fails, the method throws IOException.
* </p>
* <b>Example: Copy directories only</b>
*
* <pre>
* // only copy the directory structure
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY, false);
* </pre>
*
* <b>Example: Copy directories and txt files</b>
*
* <pre>
* // Create a filter for ".txt" files
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
*
* // Create a filter for either directories or ".txt" files
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
*
* // Copy using the filter
* FileUtils.copyDirectory(srcDir, destDir, filter, false);
* </pre>
*
* @param srcDir an existing directory to copy, must not be {@code null}
* @param destDir the new directory, must not be {@code null}
* @param fileFilter the filter to apply, null means copy all directories and files
* @param preserveFileDate true if the file date of the copy should be the same as the original
* @param copyOptions options specifying how the copy should be done, for example {@link StandardCopyOption}.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if {@code srcDir} exists but is not a directory, or
* the source and the destination directory are the same
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if an error occurs, the destination is not writable, or setting the last-modified time didn't succeed
* @since 2.8.0
*/
public static void copyDirectory(final File srcDir, final File destDir, final FileFilter fileFilter, final boolean preserveFileDate,
final CopyOption... copyOptions) throws IOException {
Objects.requireNonNull(destDir, "destination");
requireDirectoryExists(srcDir, "srcDir");
requireCanonicalPathsNotEquals(srcDir, destDir);
// Cater for destination being directory within the source directory (see IO-141)
List<String> exclusionList = null;
final String srcDirCanonicalPath = srcDir.getCanonicalPath();
final String destDirCanonicalPath = destDir.getCanonicalPath();
if (destDirCanonicalPath.startsWith(srcDirCanonicalPath)) {
final File[] srcFiles = listFiles(srcDir, fileFilter);
if (srcFiles.length > 0) {
exclusionList = new ArrayList<>(srcFiles.length);
for (final File srcFile : srcFiles) {
exclusionList.add(new File(destDir, srcFile.getName()).getCanonicalPath());
}
}
}
doCopyDirectory(srcDir, destDir, fileFilter, exclusionList, preserveFileDate, copyOptions);
}
/**
* Copies a directory to within another directory preserving the file dates.
* <p>
* This method copies the source directory and all its contents to a directory of the same name in the specified
* destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist. If the destination directory does exist, then this
* method merges the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> Setting {@code preserveFileDate} to {@code true} tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is
* not guaranteed that the operation will succeed. If the modification operation fails it falls back to
* {@link File#setLastModified(long)} and if that fails, the method throws IOException.
* </p>
*
* @param sourceDir an existing directory to copy, must not be {@code null}.
* @param destinationDir the directory to place the copy in, must not be {@code null}.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if the source or destination is invalid.
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if an error occurs, the destination is not writable, or setting the last-modified time didn't succeed
* @since 1.2
*/
public static void copyDirectoryToDirectory(final File sourceDir, final File destinationDir) throws IOException {
Objects.requireNonNull(sourceDir, "sourceDir");
requireDirectoryIfExists(destinationDir, "destinationDir");
copyDirectory(sourceDir, new File(destinationDir, sourceDir.getName()), true);
}
/**
* Copies a file to a new location preserving the file date.
* <p>
* This method copies the contents of the specified source file to the specified destination file. The directory
* holding the destination file is created if it does not exist. If the destination file exists, then this method
* overwrites it. A symbolic link is resolved before copying so the new file is not a link.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the file's last modified date/times using
* {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is not guaranteed that the
* operation will succeed. If the modification operation fails, it falls back to
* {@link File#setLastModified(long)}, and if that fails, the method throws IOException.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}.
* @param destFile the new file, must not be {@code null}.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IOException if source or destination is invalid.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @throws IOException if the output file length is not the same as the input file length after the copy completes.
* @see #copyFileToDirectory(File, File)
* @see #copyFile(File, File, boolean)
*/
public static void copyFile(final File srcFile, final File destFile) throws IOException {
copyFile(srcFile, destFile, StandardCopyOption.REPLACE_EXISTING);
}
/**
* Copies an existing file to a new file location.
* <p>
* This method copies the contents of the specified source file to the specified destination file. The directory
* holding the destination file is created if it does not exist. If the destination file exists, then this method
* overwrites it. A symbolic link is resolved before copying so the new file is not a link.
* </p>
* <p>
* <strong>Note:</strong> Setting {@code preserveFileDate} to {@code true} tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is
* not guaranteed that the operation will succeed. If the modification operation fails, it falls back to
* {@link File#setLastModified(long)}, and if that fails, the method throws IOException.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}.
* @param destFile the new file, must not be {@code null}.
* @param preserveFileDate true if the file date of the copy should be the same as the original.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IOException if source or destination is invalid.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @throws IOException if the output file length is not the same as the input file length after the copy completes
* @see #copyFile(File, File, boolean, CopyOption...)
*/
public static void copyFile(final File srcFile, final File destFile, final boolean preserveFileDate) throws IOException {
copyFile(srcFile, destFile, preserveFileDate, StandardCopyOption.REPLACE_EXISTING);
}
/**
* Copies the contents of a file to a new location.
* <p>
* This method copies the contents of the specified source file to the specified destination file. The directory
* holding the destination file is created if it does not exist. If the destination file exists, you can overwrite
* it with {@link StandardCopyOption#REPLACE_EXISTING}.
* </p>
*
* <p>
* By default, a symbolic link is resolved before copying so the new file is not a link.
* To copy symbolic links as links, you can pass {@code LinkOption.NO_FOLLOW_LINKS} as the last argument.
* </p>
*
* <p>
* <strong>Note:</strong> Setting {@code preserveFileDate} to {@code true} tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is
* not guaranteed that the operation will succeed. If the modification operation fails, it falls back to
* {@link File#setLastModified(long)}, and if that fails, the method throws IOException.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}.
* @param destFile the new file, must not be {@code null}.
* @param preserveFileDate true if the file date of the copy should be the same as the original.
* @param copyOptions options specifying how the copy should be done, for example {@link StandardCopyOption}.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws FileNotFoundException if the source does not exist.
* @throws IllegalArgumentException if {@code srcFile} or {@code destFile} is not a file
* @throws IOException if the output file length is not the same as the input file length after the copy completes.
* @throws IOException if an I/O error occurs, setting the last-modified time didn't succeed,
* or the destination is not writable
* @see #copyFileToDirectory(File, File, boolean)
* @since 2.8.0
*/
public static void copyFile(final File srcFile, final File destFile, final boolean preserveFileDate, final CopyOption... copyOptions) throws IOException {
Objects.requireNonNull(destFile, "destination");
checkFileExists(srcFile, "srcFile");
requireCanonicalPathsNotEquals(srcFile, destFile);
createParentDirectories(destFile);
if (destFile.exists()) {
checkFileExists(destFile, "destFile");
}
final Path srcPath = srcFile.toPath();
Files.copy(srcPath, destFile.toPath(), copyOptions);
// On Windows, the last modified time is copied by default.
if (preserveFileDate && !Files.isSymbolicLink(srcPath) && !setTimes(srcFile, destFile)) {
throw new IOException("Cannot set the file time.");
}
}
/**
* Copies a file to a new location.
* <p>
* This method copies the contents of the specified source file to the specified destination file. The directory
* holding the destination file is created if it does not exist. If the destination file exists, you can overwrite
* it if you use {@link StandardCopyOption#REPLACE_EXISTING}.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}.
* @param destFile the new file, must not be {@code null}.
* @param copyOptions options specifying how the copy should be done, for example {@link StandardCopyOption}..
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws FileNotFoundException if the source does not exist.
* @throws IllegalArgumentException if source is not a file.
* @throws IOException if an I/O error occurs.
* @see StandardCopyOption
* @since 2.9.0
*/
public static void copyFile(final File srcFile, final File destFile, final CopyOption... copyOptions) throws IOException {
copyFile(srcFile, destFile, true, copyOptions);
}
/**
* Copies bytes from a {@link File} to an {@link OutputStream}.
* <p>
* This method buffers the input internally, so there is no need to use a {@link BufferedInputStream}.
* </p>
*
* @param input the {@link File} to read.
* @param output the {@link OutputStream} to write.
* @return the number of bytes copied
* @throws NullPointerException if the File is {@code null}.
* @throws NullPointerException if the OutputStream is {@code null}.
* @throws IOException if an I/O error occurs.
* @since 2.1
*/
public static long copyFile(final File input, final OutputStream output) throws IOException {
try (InputStream fis = Files.newInputStream(input.toPath())) {
return IOUtils.copyLarge(fis, output);
}
}
/**
* Copies a file to a directory preserving the file date.
* <p>
* This method copies the contents of the specified source file to a file of the same name in the specified
* destination directory. The destination directory is created if it does not exist. If the destination file exists,
* then this method will overwrite it.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the file's last modified date/times using
* {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is not guaranteed that the
* operation will succeed. If the modification operation fails it falls back to
* {@link File#setLastModified(long)} and if that fails, the method throws IOException.
* </p>
*
* @param srcFile an existing file to copy, must not be {@code null}.
* @param destDir the directory to place the copy in, must not be {@code null}.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if source or destination is invalid.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @see #copyFile(File, File, boolean)
*/
public static void copyFileToDirectory(final File srcFile, final File destDir) throws IOException {
copyFileToDirectory(srcFile, destDir, true);
}
/**
* Copies a file to a directory optionally preserving the file date.
* <p>
* This method copies the contents of the specified source file to a file of the same name in the specified
* destination directory. The destination directory is created if it does not exist. If the destination file exists,
* then this method will overwrite it.
* </p>
* <p>
* <strong>Note:</strong> Setting {@code preserveFileDate} to {@code true} tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is
* not guaranteed that the operation will succeed. If the modification operation fails it falls back to
* {@link File#setLastModified(long)} and if that fails, the method throws IOException.
* </p>
*
* @param sourceFile an existing file to copy, must not be {@code null}.
* @param destinationDir the directory to place the copy in, must not be {@code null}.
* @param preserveFileDate true if the file date of the copy should be the same as the original.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @throws IOException if the output file length is not the same as the input file length after the copy completes.
* @see #copyFile(File, File, CopyOption...)
* @since 1.3
*/
public static void copyFileToDirectory(final File sourceFile, final File destinationDir, final boolean preserveFileDate) throws IOException {
Objects.requireNonNull(sourceFile, "sourceFile");
requireDirectoryIfExists(destinationDir, "destinationDir");
copyFile(sourceFile, new File(destinationDir, sourceFile.getName()), preserveFileDate);
}
/**
* Copies bytes from an {@link InputStream} {@code source} to a file
* {@code destination}. The directories up to {@code destination}
* will be created if they don't already exist. {@code destination}
* will be overwritten if it already exists.
* <p>
* <em>The {@code source} stream is closed.</em>
* </p>
* <p>
* See {@link #copyToFile(InputStream, File)} for a method that does not close the input stream.
* </p>
*
* @param source the {@link InputStream} to copy bytes from, must not be {@code null}, will be closed
* @param destination the non-directory {@link File} to write bytes to
* (possibly overwriting), must not be {@code null}
* @throws IOException if {@code destination} is a directory
* @throws IOException if {@code destination} cannot be written
* @throws IOException if {@code destination} needs creating but can't be
* @throws IOException if an IO error occurs during copying
* @since 2.0
*/
public static void copyInputStreamToFile(final InputStream source, final File destination) throws IOException {
try (InputStream inputStream = source) {
copyToFile(inputStream, destination);
}
}
/**
* Copies a file or directory to within another directory preserving the file dates.
* <p>
* This method copies the source file or directory, along with all its contents, to a directory of the same name in the
* specified destination directory.
* </p>
* <p>
* The destination directory is created if it does not exist. If the destination directory does exist, then this method
* merges the source with the destination, with the source taking precedence.
* </p>
* <p>
* <strong>Note:</strong> Setting {@code preserveFileDate} to {@code true} tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is
* not guaranteed that the operation will succeed. If the modification operation fails it falls back to
* {@link File#setLastModified(long)} and if that fails, the method throws IOException.
* </p>
*
* @param sourceFile an existing file or directory to copy, must not be {@code null}.
* @param destinationDir the directory to place the copy in, must not be {@code null}.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if the source or destination is invalid.
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @see #copyDirectoryToDirectory(File, File)
* @see #copyFileToDirectory(File, File)
* @since 2.6
*/
public static void copyToDirectory(final File sourceFile, final File destinationDir) throws IOException {
Objects.requireNonNull(sourceFile, "sourceFile");
if (sourceFile.isFile()) {
copyFileToDirectory(sourceFile, destinationDir);
} else if (sourceFile.isDirectory()) {
copyDirectoryToDirectory(sourceFile, destinationDir);
} else {
throw new FileNotFoundException("The source " + sourceFile + " does not exist");
}
}
/**
* Copies a files to a directory preserving each file's date.
* <p>
* This method copies the contents of the specified source files
* to a file of the same name in the specified destination directory.
* The destination directory is created if it does not exist.
* If the destination file exists, then this method will overwrite it.
* </p>
* <p>
* <strong>Note:</strong> This method tries to preserve the file's last
* modified date/times using {@link BasicFileAttributeView#setTimes(FileTime, FileTime, FileTime)}. However, it is
* not guaranteed that the operation will succeed. If the modification operation fails it falls back to
* {@link File#setLastModified(long)} and if that fails, the method throws IOException.
* </p>
*
* @param sourceIterable existing files to copy, must not be {@code null}.
* @param destinationDir the directory to place the copies in, must not be {@code null}.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IOException if source or destination is invalid.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @see #copyFileToDirectory(File, File)
* @since 2.6
*/
public static void copyToDirectory(final Iterable<File> sourceIterable, final File destinationDir) throws IOException {
Objects.requireNonNull(sourceIterable, "sourceIterable");
for (final File src : sourceIterable) {
copyFileToDirectory(src, destinationDir);
}
}
/**
* Copies bytes from an {@link InputStream} source to a {@link File} destination. The directories
* up to {@code destination} will be created if they don't already exist. {@code destination} will be
* overwritten if it already exists. The {@code source} stream is left open, e.g. for use with
* {@link java.util.zip.ZipInputStream ZipInputStream}. See {@link #copyInputStreamToFile(InputStream, File)} for a
* method that closes the input stream.
*
* @param inputStream the {@link InputStream} to copy bytes from, must not be {@code null}
* @param file the non-directory {@link File} to write bytes to (possibly overwriting), must not be
* {@code null}
* @throws NullPointerException if the InputStream is {@code null}.
* @throws NullPointerException if the File is {@code null}.
* @throws IllegalArgumentException if the file object is a directory.
* @throws IllegalArgumentException if the file is not writable.
* @throws IOException if the directories could not be created.
* @throws IOException if an IO error occurs during copying.
* @since 2.5
*/
public static void copyToFile(final InputStream inputStream, final File file) throws IOException {
try (OutputStream out = newOutputStream(file, false)) {
IOUtils.copy(inputStream, out);
}
}
/**
* Copies bytes from the URL {@code source} to a file
* {@code destination}. The directories up to {@code destination}
* will be created if they don't already exist. {@code destination}
* will be overwritten if it already exists.
* <p>
* Warning: this method does not set a connection or read timeout and thus
* might block forever. Use {@link #copyURLToFile(URL, File, int, int)}
* with reasonable timeouts to prevent this.
* </p>
*
* @param source the {@link URL} to copy bytes from, must not be {@code null}
* @param destination the non-directory {@link File} to write bytes to
* (possibly overwriting), must not be {@code null}
* @throws IOException if {@code source} URL cannot be opened
* @throws IOException if {@code destination} is a directory
* @throws IOException if {@code destination} cannot be written
* @throws IOException if {@code destination} needs creating but can't be
* @throws IOException if an IO error occurs during copying
*/
public static void copyURLToFile(final URL source, final File destination) throws IOException {
final Path path = destination.toPath();
PathUtils.createParentDirectories(path);
PathUtils.copy(source::openStream, path, StandardCopyOption.REPLACE_EXISTING);
}
/**
* Copies bytes from the URL {@code source} to a file {@code destination}. The directories up to
* {@code destination} will be created if they don't already exist. {@code destination} will be
* overwritten if it already exists.
*
* @param source the {@link URL} to copy bytes from, must not be {@code null}
* @param destination the non-directory {@link File} to write bytes to (possibly overwriting), must not be
* {@code null}
* @param connectionTimeoutMillis the number of milliseconds until this method will time out if no connection could
* be established to the {@code source}
* @param readTimeoutMillis the number of milliseconds until this method will time out if no data could be read from
* the {@code source}
* @throws IOException if {@code source} URL cannot be opened
* @throws IOException if {@code destination} is a directory
* @throws IOException if {@code destination} cannot be written
* @throws IOException if {@code destination} needs creating but can't be
* @throws IOException if an IO error occurs during copying
* @since 2.0
*/
public static void copyURLToFile(final URL source, final File destination, final int connectionTimeoutMillis, final int readTimeoutMillis)
throws IOException {
try (CloseableURLConnection urlConnection = CloseableURLConnection.open(source)) {
urlConnection.setConnectTimeout(connectionTimeoutMillis);
urlConnection.setReadTimeout(readTimeoutMillis);
try (InputStream stream = urlConnection.getInputStream()) {
copyInputStreamToFile(stream, destination);
}
}
}
/**
* Creates all parent directories for a File object, including any necessary but non-existent parent directories. If a parent directory already exists or
* is null, nothing happens.
*
* @param file the File that may need parents, may be null.
* @return The parent directory, or {@code null} if the given File does have a parent.
* @throws IOException if the directory was not created along with all its parent directories.
* @throws SecurityException See {@link File#mkdirs()}.
* @since 2.9.0
*/
public static File createParentDirectories(final File file) throws IOException {
return mkdirs(getParentFile(file));
}
/**
* Gets the current directory.
*
* @return the current directory.
* @since 2.12.0
*/
public static File current() {
return PathUtils.current().toFile();
}
/**
* Decodes the specified URL as per RFC 3986, i.e. transforms
* percent-encoded octets to characters by decoding with the UTF-8 character
* set. This function is primarily intended for usage with
* {@link java.net.URL} which unfortunately does not enforce proper URLs. As
* such, this method will leniently accept invalid characters or malformed
* percent-encoded octets and simply pass them literally through to the
* result string. Except for rare edge cases, this will make unencoded URLs
* pass through unaltered.
*
* @param url The URL to decode, may be {@code null}.
* @return The decoded URL or {@code null} if the input was
* {@code null}.
*/
static String decodeUrl(final String url) {
String decoded = url;
if (url != null && url.indexOf('%') >= 0) {
final int n = url.length();
final StringBuilder builder = new StringBuilder();
final ByteBuffer byteBuffer = ByteBuffer.allocate(n);
for (int i = 0; i < n; ) {
if (url.charAt(i) == '%') {
try {
do {
final byte octet = (byte) Integer.parseInt(url.substring(i + 1, i + 3), 16);
byteBuffer.put(octet);
i += 3;
} while (i < n && url.charAt(i) == '%');
continue;
} catch (final IndexOutOfBoundsException | NumberFormatException ignored) {
// malformed percent-encoded octet, fall through and
// append characters literally
} finally {
if (byteBuffer.position() > 0) {
byteBuffer.flip();
builder.append(StandardCharsets.UTF_8.decode(byteBuffer).toString());
byteBuffer.clear();
}
}
}
builder.append(url.charAt(i++));
}
decoded = builder.toString();
}
return decoded;
}
/**
* Deletes the given File but throws an IOException if it cannot, unlike {@link File#delete()} which returns a
* boolean.
*
* @param file The file to delete.
* @return the given file.
* @throws NullPointerException if the parameter is {@code null}
* @throws IOException if the file cannot be deleted.
* @see File#delete()
* @since 2.9.0
*/
public static File delete(final File file) throws IOException {
Objects.requireNonNull(file, "file");
Files.delete(file.toPath());
return file;
}
/**
* Deletes a directory recursively.
*
* @param directory directory to delete
* @throws IOException in case deletion is unsuccessful
* @throws NullPointerException if the parameter is {@code null}
* @throws IllegalArgumentException if {@code directory} is not a directory
*/
public static void deleteDirectory(final File directory) throws IOException {
Objects.requireNonNull(directory, "directory");
if (!directory.exists()) {
return;
}
if (!isSymlink(directory)) {
cleanDirectory(directory);
}
delete(directory);
}
/**
* Schedules a directory recursively for deletion on JVM exit.
*
* @param directory directory to delete, must not be {@code null}
* @throws NullPointerException if the directory is {@code null}
* @throws IOException in case deletion is unsuccessful
*/
private static void deleteDirectoryOnExit(final File directory) throws IOException {
if (!directory.exists()) {
return;
}
directory.deleteOnExit();
if (!isSymlink(directory)) {
cleanDirectoryOnExit(directory);
}
}
/**
* Deletes a file, never throwing an exception. If file is a directory, delete it and all subdirectories.
* <p>
* The difference between File.delete() and this method are:
* </p>
* <ul>
* <li>A directory to be deleted does not have to be empty.</li>
* <li>No exceptions are thrown when a file or directory cannot be deleted.</li>
* </ul>
*
* @param file file or directory to delete, can be {@code null}
* @return {@code true} if the file or directory was deleted, otherwise
* {@code false}
* @since 1.4
*/
public static boolean deleteQuietly(final File file) {
if (file == null) {
return false;
}
try {
if (file.isDirectory()) {
cleanDirectory(file);
}
} catch (final Exception ignored) {
// ignore
}
try {
return file.delete();
} catch (final Exception ignored) {
return false;
}
}
/**
* Determines whether the {@code parent} directory contains the {@code child} element (a file or directory).
* <p>
* Files are normalized before comparison.
* </p>
*
* Edge cases:
* <ul>
* <li>A {@code directory} must not be null: if null, throw NullPointerException</li>
* <li>A {@code directory} must be a directory: if not a directory, throw IllegalArgumentException</li>
* <li>A directory does not contain itself: return false</li>
* <li>A null child file is not contained in any parent: return false</li>
* </ul>
*
* @param directory the file to consider as the parent.
* @param child the file to consider as the child.
* @return true is the candidate leaf is under by the specified composite. False otherwise.
* @throws IOException if an IO error occurs while checking the files.
* @throws NullPointerException if the parent is {@code null}.
* @throws IllegalArgumentException if the parent is not a directory.
* @see FilenameUtils#directoryContains(String, String)
* @since 2.2
*/
public static boolean directoryContains(final File directory, final File child) throws IOException {
requireDirectoryExists(directory, "directory");
if (child == null || !child.exists()) {
return false;
}
// Canonicalize paths (normalizes relative paths)
return FilenameUtils.directoryContains(directory.getCanonicalPath(), child.getCanonicalPath());
}
/**
* Internal copy directory method. Creates all destination parent directories,
* including any necessary but non-existent parent directories.
*
* @param srcDir the validated source directory, must not be {@code null}.
* @param destDir the validated destination directory, must not be {@code null}.
* @param fileFilter the filter to apply, null means copy all directories and files.
* @param exclusionList List of files and directories to exclude from the copy, may be null.
* @param preserveDirDate preserve the directories last modified dates.
* @param copyOptions options specifying how the copy should be done, see {@link StandardCopyOption}.
* @throws IOException if the directory was not created along with all its parent directories.
* @throws IllegalArgumentException if {@code destDir} is not writable
* @throws SecurityException See {@link File#mkdirs()}.
*/
private static void doCopyDirectory(final File srcDir, final File destDir, final FileFilter fileFilter, final List<String> exclusionList,
final boolean preserveDirDate, final CopyOption... copyOptions) throws IOException {
// recurse dirs, copy files.
final File[] srcFiles = listFiles(srcDir, fileFilter);
requireDirectoryIfExists(destDir, "destDir");
mkdirs(destDir);
for (final File srcFile : srcFiles) {
final File dstFile = new File(destDir, srcFile.getName());
if (exclusionList == null || !exclusionList.contains(srcFile.getCanonicalPath())) {
if (srcFile.isDirectory()) {
doCopyDirectory(srcFile, dstFile, fileFilter, exclusionList, preserveDirDate, copyOptions);
} else {
copyFile(srcFile, dstFile, preserveDirDate, copyOptions);
}
}
}
// Do this last, as the above has probably affected directory metadata
if (preserveDirDate) {
setTimes(srcDir, destDir);
}
}
/**
* Deletes a file or directory. For a directory, delete it and all subdirectories.
* <p>
* The difference between File.delete() and this method are:
* </p>
* <ul>
* <li>The directory does not have to be empty.</li>
* <li>You get an exception when a file or directory cannot be deleted.</li>
* </ul>
*
* @param file file or directory to delete, must not be {@code null}.
* @throws NullPointerException if the file is {@code null}.
* @throws FileNotFoundException if the file was not found.
* @throws IOException in case deletion is unsuccessful.
*/
public static void forceDelete(final File file) throws IOException {
Objects.requireNonNull(file, "file");
final Counters.PathCounters deleteCounters;
try {
deleteCounters = PathUtils.delete(
file.toPath(), PathUtils.EMPTY_LINK_OPTION_ARRAY,
StandardDeleteOption.OVERRIDE_READ_ONLY);
} catch (final IOException ex) {
throw new IOException("Cannot delete file: " + file, ex);
}
if (deleteCounters.getFileCounter().get() < 1 && deleteCounters.getDirectoryCounter().get() < 1) {
// didn't find a file to delete.
throw new FileNotFoundException("File does not exist: " + file);
}
}
/**
* Schedules a file to be deleted when JVM exits.
* If file is directory delete it and all subdirectories.
*
* @param file file or directory to delete, must not be {@code null}.
* @throws NullPointerException if the file is {@code null}.
* @throws IOException in case deletion is unsuccessful.
*/
public static void forceDeleteOnExit(final File file) throws IOException {
Objects.requireNonNull(file, "file");
if (file.isDirectory()) {
deleteDirectoryOnExit(file);
} else {
file.deleteOnExit();
}
}
/**
* Creates all directories for a File object, including any necessary but non-existent parent directories. If the {@code directory} already exists or is
* null, nothing happens.
* <p>
* Calls {@link File#mkdirs()} and throws an {@link IOException} on failure.
* </p>
*
* @param directory the receiver for {@code mkdirs()}. If the {@code directory} already exists or is null, nothing happens.
* @throws IOException if the directory was not created along with all its parent directories.
* @throws IOException if the given file object is not a directory.
* @throws SecurityException See {@link File#mkdirs()}.
* @see File#mkdirs()
*/
public static void forceMkdir(final File directory) throws IOException {
mkdirs(directory);
}
/**
* Creates all directories for a File object, including any necessary but non-existent parent directories. If the parent directory already exists or is
* null, nothing happens.
* <p>
* Calls {@link File#mkdirs()} for the parent of {@code file}.
* </p>
*
* @param file file with parents to create, must not be {@code null}.
* @throws NullPointerException if the file is {@code null}.
* @throws IOException if the directory was not created along with all its parent directories.
* @throws SecurityException See {@link File#mkdirs()}.
* @see File#mkdirs()
* @since 2.5
*/
public static void forceMkdirParent(final File file) throws IOException {
forceMkdir(getParentFile(Objects.requireNonNull(file, "file")));
}
/**
* Constructs a file from the set of name elements.
*
* @param directory the parent directory.
* @param names the name elements.
* @return the new file.
* @since 2.1
*/
public static File getFile(final File directory, final String... names) {
Objects.requireNonNull(directory, "directory");
Objects.requireNonNull(names, "names");
File file = directory;
for (final String name : names) {
file = new File(file, name);
}
return file;
}
/**
* Constructs a file from the set of name elements.
*
* @param names the name elements.
* @return the file.
* @since 2.1
*/
public static File getFile(final String... names) {
Objects.requireNonNull(names, "names");
File file = null;
for (final String name : names) {
if (file == null) {
file = new File(name);
} else {
file = new File(file, name);
}
}
return file;
}
/**
* Gets the parent of the given file. The given file may be null. Note that a file's parent may be null as well.
*
* @param file The file to query, may be null.
* @return The parent file or {@code null}. Note that a file's parent may be null as well.
*/
private static File getParentFile(final File file) {
return file == null ? null : file.getParentFile();
}
/**
* Returns a {@link File} representing the system temporary directory.
*
* @return the system temporary directory as a File
* @since 2.0
*/
public static File getTempDirectory() {
return new File(getTempDirectoryPath());
}
/**
* Returns the path to the system temporary directory.
*
* WARNING: this method relies on the Java system property 'java.io.tmpdir'
* which may or may not have a trailing file separator.
* This can affect code that uses String processing to manipulate pathnames rather
* than the standard libary methods in classes such as {@link java.io.File}
*
* @return the path to the system temporary directory as a String
* @since 2.0
*/
public static String getTempDirectoryPath() {
return System.getProperty("java.io.tmpdir");
}
/**
* Returns a {@link File} representing the user's home directory.
*
* @return the user's home directory.
* @since 2.0
*/
public static File getUserDirectory() {
return new File(getUserDirectoryPath());
}
/**
* Returns the path to the user's home directory.
*
* @return the path to the user's home directory.
* @since 2.0
*/
public static String getUserDirectoryPath() {
return System.getProperty("user.home");
}
/**
* Tests whether the specified {@link File} is a directory or not. Implemented as a
* null-safe delegate to {@link Files#isDirectory(Path path, LinkOption... options)}.
*
* @param file the path to the file.
* @param options options indicating how symbolic links are handled
* @return {@code true} if the file is a directory; {@code false} if
* the path is null, the file does not exist, is not a directory, or it cannot
* be determined if the file is a directory or not.
* @throws SecurityException In the case of the default provider, and a security manager is installed, the
* {@link SecurityManager#checkRead(String) checkRead} method is invoked to check read
* access to the directory.
* @since 2.9.0
*/
public static boolean isDirectory(final File file, final LinkOption... options) {
return file != null && Files.isDirectory(file.toPath(), options);
}
/**
* Tests whether the directory is empty.
*
* @param directory the directory to query.
* @return whether the directory is empty.
* @throws IOException if an I/O error occurs.
* @throws NotDirectoryException if the file could not otherwise be opened because it is not a directory
* <i>(optional specific exception)</i>.
* @since 2.9.0
*/
public static boolean isEmptyDirectory(final File directory) throws IOException {
return PathUtils.isEmptyDirectory(directory.toPath());
}
/**
* Tests if the specified {@link File} is newer than the specified {@link ChronoLocalDate}
* at the end of day.
*
* <p>Note: The input date is assumed to be in the system default time-zone with the time
* part set to the current time. To use a non-default time-zone use the method
* {@link #isFileNewer(File, ChronoLocalDateTime, ZoneId)
* isFileNewer(file, chronoLocalDate.atTime(LocalTime.now(zoneId)), zoneId)} where
* {@code zoneId} is a valid {@link ZoneId}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoLocalDate the date reference.
* @return true if the {@link File} exists and has been modified after the given
* {@link ChronoLocalDate} at the current time.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file or local date is {@code null}.
* @since 2.8.0
*/
public static boolean isFileNewer(final File file, final ChronoLocalDate chronoLocalDate) {
return isFileNewer(file, chronoLocalDate, LocalTime.MAX);
}
/**
* Tests if the specified {@link File} is newer than the specified {@link ChronoLocalDate}
* at the specified time.
*
* <p>Note: The input date and time are assumed to be in the system default time-zone. To use a
* non-default time-zone use the method {@link #isFileNewer(File, ChronoLocalDateTime, ZoneId)
* isFileNewer(file, chronoLocalDate.atTime(localTime), zoneId)} where {@code zoneId} is a valid
* {@link ZoneId}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoLocalDate the date reference.
* @param localTime the time reference.
* @return true if the {@link File} exists and has been modified after the given
* {@link ChronoLocalDate} at the given time.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file, local date or zone ID is {@code null}.
* @since 2.8.0
*/
public static boolean isFileNewer(final File file, final ChronoLocalDate chronoLocalDate, final LocalTime localTime) {
Objects.requireNonNull(chronoLocalDate, "chronoLocalDate");
Objects.requireNonNull(localTime, "localTime");
return isFileNewer(file, chronoLocalDate.atTime(localTime));
}
/**
* Tests if the specified {@link File} is newer than the specified {@link ChronoLocalDate} at the specified
* {@link OffsetTime}.
*
* @param file the {@link File} of which the modification date must be compared
* @param chronoLocalDate the date reference
* @param offsetTime the time reference
* @return true if the {@link File} exists and has been modified after the given {@link ChronoLocalDate} at the given
* {@link OffsetTime}.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file, local date or zone ID is {@code null}
* @since 2.12.0
*/
public static boolean isFileNewer(final File file, final ChronoLocalDate chronoLocalDate, final OffsetTime offsetTime) {
Objects.requireNonNull(chronoLocalDate, "chronoLocalDate");
Objects.requireNonNull(offsetTime, "offsetTime");
return isFileNewer(file, chronoLocalDate.atTime(offsetTime.toLocalTime()));
}
/**
* Tests if the specified {@link File} is newer than the specified {@link ChronoLocalDateTime}
* at the system-default time zone.
*
* <p>Note: The input date and time is assumed to be in the system default time-zone. To use a
* non-default time-zone use the method {@link #isFileNewer(File, ChronoLocalDateTime, ZoneId)
* isFileNewer(file, chronoLocalDateTime, zoneId)} where {@code zoneId} is a valid
* {@link ZoneId}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoLocalDateTime the date reference.
* @return true if the {@link File} exists and has been modified after the given
* {@link ChronoLocalDateTime} at the system-default time zone.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file or local date time is {@code null}.
* @since 2.8.0
*/
public static boolean isFileNewer(final File file, final ChronoLocalDateTime<?> chronoLocalDateTime) {
return isFileNewer(file, chronoLocalDateTime, ZoneId.systemDefault());
}
/**
* Tests if the specified {@link File} is newer than the specified {@link ChronoLocalDateTime}
* at the specified {@link ZoneId}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoLocalDateTime the date reference.
* @param zoneId the time zone.
* @return true if the {@link File} exists and has been modified after the given
* {@link ChronoLocalDateTime} at the given {@link ZoneId}.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file, local date time or zone ID is {@code null}.
* @since 2.8.0
*/
public static boolean isFileNewer(final File file, final ChronoLocalDateTime<?> chronoLocalDateTime, final ZoneId zoneId) {
Objects.requireNonNull(chronoLocalDateTime, "chronoLocalDateTime");
Objects.requireNonNull(zoneId, "zoneId");
return isFileNewer(file, chronoLocalDateTime.atZone(zoneId));
}
/**
* Tests if the specified {@link File} is newer than the specified {@link ChronoZonedDateTime}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoZonedDateTime the date reference.
* @return true if the {@link File} exists and has been modified after the given
* {@link ChronoZonedDateTime}.
* @throws NullPointerException if the file or zoned date time is {@code null}.
* @throws UncheckedIOException if an I/O error occurs
* @since 2.8.0
*/
public static boolean isFileNewer(final File file, final ChronoZonedDateTime<?> chronoZonedDateTime) {
Objects.requireNonNull(file, "file");
Objects.requireNonNull(chronoZonedDateTime, "chronoZonedDateTime");
return Uncheck.get(() -> PathUtils.isNewer(file.toPath(), chronoZonedDateTime));
}
/**
* Tests if the specified {@link File} is newer than the specified {@link Date}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param date the date reference.
* @return true if the {@link File} exists and has been modified
* after the given {@link Date}.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file or date is {@code null}.
*/
public static boolean isFileNewer(final File file, final Date date) {
Objects.requireNonNull(date, "date");
return isFileNewer(file, date.getTime());
}
/**
* Tests if the specified {@link File} is newer than the reference {@link File}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param reference the {@link File} of which the modification date is used.
* @return true if the {@link File} exists and has been modified more
* recently than the reference {@link File}.
* @throws NullPointerException if the file or reference file is {@code null}.
* @throws UncheckedIOException if the reference file doesn't exist.
*/
public static boolean isFileNewer(final File file, final File reference) {
return Uncheck.get(() -> PathUtils.isNewer(file.toPath(), reference.toPath()));
}
/**
* Tests if the specified {@link File} is newer than the specified {@link FileTime}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param fileTime the file time reference.
* @return true if the {@link File} exists and has been modified after the given {@link FileTime}.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file or local date is {@code null}.
* @since 2.12.0
*/
public static boolean isFileNewer(final File file, final FileTime fileTime) throws IOException {
Objects.requireNonNull(file, "file");
return PathUtils.isNewer(file.toPath(), fileTime);
}
/**
* Tests if the specified {@link File} is newer than the specified {@link Instant}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param instant the date reference.
* @return true if the {@link File} exists and has been modified after the given {@link Instant}.
* @throws NullPointerException if the file or instant is {@code null}.
* @throws UncheckedIOException if an I/O error occurs
* @since 2.8.0
*/
public static boolean isFileNewer(final File file, final Instant instant) {
Objects.requireNonNull(instant, "instant");
return Uncheck.get(() -> PathUtils.isNewer(file.toPath(), instant));
}
/**
* Tests if the specified {@link File} is newer than the specified time reference.
*
* @param file the {@link File} of which the modification date must be compared.
* @param timeMillis the time reference measured in milliseconds since the
* epoch (00:00:00 GMT, January 1, 1970).
* @return true if the {@link File} exists and has been modified after the given time reference.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file is {@code null}.
*/
public static boolean isFileNewer(final File file, final long timeMillis) {
Objects.requireNonNull(file, "file");
return Uncheck.get(() -> PathUtils.isNewer(file.toPath(), timeMillis));
}
/**
* Tests if the specified {@link File} is newer than the specified {@link OffsetDateTime}.
*
* @param file the {@link File} of which the modification date must be compared
* @param offsetDateTime the date reference
* @return true if the {@link File} exists and has been modified before the given {@link OffsetDateTime}.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file or zoned date time is {@code null}
* @since 2.12.0
*/
public static boolean isFileNewer(final File file, final OffsetDateTime offsetDateTime) {
Objects.requireNonNull(offsetDateTime, "offsetDateTime");
return isFileNewer(file, offsetDateTime.toInstant());
}
/**
* Tests if the specified {@link File} is older than the specified {@link ChronoLocalDate}
* at the end of day.
*
* <p>Note: The input date is assumed to be in the system default time-zone with the time
* part set to the current time. To use a non-default time-zone use the method
* {@link #isFileOlder(File, ChronoLocalDateTime, ZoneId)
* isFileOlder(file, chronoLocalDate.atTime(LocalTime.now(zoneId)), zoneId)} where
* {@code zoneId} is a valid {@link ZoneId}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoLocalDate the date reference.
* @return true if the {@link File} exists and has been modified before the given
* {@link ChronoLocalDate} at the current time.
* @throws NullPointerException if the file or local date is {@code null}.
* @throws UncheckedIOException if an I/O error occurs
* @see ZoneId#systemDefault()
* @see LocalTime#now()
* @since 2.8.0
*/
public static boolean isFileOlder(final File file, final ChronoLocalDate chronoLocalDate) {
return isFileOlder(file, chronoLocalDate, LocalTime.MAX);
}
/**
* Tests if the specified {@link File} is older than the specified {@link ChronoLocalDate}
* at the specified {@link LocalTime}.
*
* <p>Note: The input date and time are assumed to be in the system default time-zone. To use a
* non-default time-zone use the method {@link #isFileOlder(File, ChronoLocalDateTime, ZoneId)
* isFileOlder(file, chronoLocalDate.atTime(localTime), zoneId)} where {@code zoneId} is a valid
* {@link ZoneId}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoLocalDate the date reference.
* @param localTime the time reference.
* @return true if the {@link File} exists and has been modified before the
* given {@link ChronoLocalDate} at the specified time.
* @throws UncheckedIOException if an I/O error occurs
* @throws NullPointerException if the file, local date or local time is {@code null}.
* @see ZoneId#systemDefault()
* @since 2.8.0
*/
public static boolean isFileOlder(final File file, final ChronoLocalDate chronoLocalDate, final LocalTime localTime) {
Objects.requireNonNull(chronoLocalDate, "chronoLocalDate");
Objects.requireNonNull(localTime, "localTime");
return isFileOlder(file, chronoLocalDate.atTime(localTime));
}
/**
* Tests if the specified {@link File} is older than the specified {@link ChronoLocalDate} at the specified
* {@link OffsetTime}.
*
* @param file the {@link File} of which the modification date must be compared
* @param chronoLocalDate the date reference
* @param offsetTime the time reference
* @return true if the {@link File} exists and has been modified after the given {@link ChronoLocalDate} at the given
* {@link OffsetTime}.
* @throws NullPointerException if the file, local date or zone ID is {@code null}
* @throws UncheckedIOException if an I/O error occurs
* @since 2.12.0
*/
public static boolean isFileOlder(final File file, final ChronoLocalDate chronoLocalDate, final OffsetTime offsetTime) {
Objects.requireNonNull(chronoLocalDate, "chronoLocalDate");
Objects.requireNonNull(offsetTime, "offsetTime");
return isFileOlder(file, chronoLocalDate.atTime(offsetTime.toLocalTime()));
}
/**
* Tests if the specified {@link File} is older than the specified {@link ChronoLocalDateTime}
* at the system-default time zone.
*
* <p>Note: The input date and time is assumed to be in the system default time-zone. To use a
* non-default time-zone use the method {@link #isFileOlder(File, ChronoLocalDateTime, ZoneId)
* isFileOlder(file, chronoLocalDateTime, zoneId)} where {@code zoneId} is a valid
* {@link ZoneId}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoLocalDateTime the date reference.
* @return true if the {@link File} exists and has been modified before the given
* {@link ChronoLocalDateTime} at the system-default time zone.
* @throws NullPointerException if the file or local date time is {@code null}.
* @throws UncheckedIOException if an I/O error occurs
* @see ZoneId#systemDefault()
* @since 2.8.0
*/
public static boolean isFileOlder(final File file, final ChronoLocalDateTime<?> chronoLocalDateTime) {
return isFileOlder(file, chronoLocalDateTime, ZoneId.systemDefault());
}
/**
* Tests if the specified {@link File} is older than the specified {@link ChronoLocalDateTime}
* at the specified {@link ZoneId}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoLocalDateTime the date reference.
* @param zoneId the time zone.
* @return true if the {@link File} exists and has been modified before the given
* {@link ChronoLocalDateTime} at the given {@link ZoneId}.
* @throws NullPointerException if the file, local date time or zone ID is {@code null}.
* @throws UncheckedIOException if an I/O error occurs
* @since 2.8.0
*/
public static boolean isFileOlder(final File file, final ChronoLocalDateTime<?> chronoLocalDateTime, final ZoneId zoneId) {
Objects.requireNonNull(chronoLocalDateTime, "chronoLocalDateTime");
Objects.requireNonNull(zoneId, "zoneId");
return isFileOlder(file, chronoLocalDateTime.atZone(zoneId));
}
/**
* Tests if the specified {@link File} is older than the specified {@link ChronoZonedDateTime}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param chronoZonedDateTime the date reference.
* @return true if the {@link File} exists and has been modified before the given
* {@link ChronoZonedDateTime}.
* @throws NullPointerException if the file or zoned date time is {@code null}.
* @throws UncheckedIOException if an I/O error occurs
* @since 2.8.0
*/
public static boolean isFileOlder(final File file, final ChronoZonedDateTime<?> chronoZonedDateTime) {
Objects.requireNonNull(chronoZonedDateTime, "chronoZonedDateTime");
return isFileOlder(file, chronoZonedDateTime.toInstant());
}
/**
* Tests if the specified {@link File} is older than the specified {@link Date}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param date the date reference.
* @return true if the {@link File} exists and has been modified before the given {@link Date}.
* @throws NullPointerException if the file or date is {@code null}.
* @throws UncheckedIOException if an I/O error occurs
*/
public static boolean isFileOlder(final File file, final Date date) {
Objects.requireNonNull(date, "date");
return isFileOlder(file, date.getTime());
}
/**
* Tests if the specified {@link File} is older than the reference {@link File}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param reference the {@link File} of which the modification date is used.
* @return true if the {@link File} exists and has been modified before the reference {@link File}.
* @throws NullPointerException if the file or reference file is {@code null}.
* @throws FileNotFoundException if the reference file doesn't exist.
* @throws UncheckedIOException if an I/O error occurs
*/
public static boolean isFileOlder(final File file, final File reference) throws FileNotFoundException {
return Uncheck.get(() -> PathUtils.isOlder(file.toPath(), reference.toPath()));
}
/**
* Tests if the specified {@link File} is older than the specified {@link FileTime}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param fileTime the file time reference.
* @return true if the {@link File} exists and has been modified before the given {@link FileTime}.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file or local date is {@code null}.
* @since 2.12.0
*/
public static boolean isFileOlder(final File file, final FileTime fileTime) throws IOException {
Objects.requireNonNull(file, "file");
return PathUtils.isOlder(file.toPath(), fileTime);
}
/**
* Tests if the specified {@link File} is older than the specified {@link Instant}.
*
* @param file the {@link File} of which the modification date must be compared.
* @param instant the date reference.
* @return true if the {@link File} exists and has been modified before the given {@link Instant}.
* @throws NullPointerException if the file or instant is {@code null}.
* @since 2.8.0
*/
public static boolean isFileOlder(final File file, final Instant instant) {
Objects.requireNonNull(instant, "instant");
return Uncheck.get(() -> PathUtils.isOlder(file.toPath(), instant));
}
/**
* Tests if the specified {@link File} is older than the specified time reference.
*
* @param file the {@link File} of which the modification date must be compared.
* @param timeMillis the time reference measured in milliseconds since the
* epoch (00:00:00 GMT, January 1, 1970).
* @return true if the {@link File} exists and has been modified before the given time reference.
* @throws NullPointerException if the file is {@code null}.
* @throws UncheckedIOException if an I/O error occurs
*/
public static boolean isFileOlder(final File file, final long timeMillis) {
Objects.requireNonNull(file, "file");
return Uncheck.get(() -> PathUtils.isOlder(file.toPath(), timeMillis));
}
/**
* Tests if the specified {@link File} is older than the specified {@link OffsetDateTime}.
*
* @param file the {@link File} of which the modification date must be compared
* @param offsetDateTime the date reference
* @return true if the {@link File} exists and has been modified before the given {@link OffsetDateTime}.
* @throws NullPointerException if the file or zoned date time is {@code null}
* @since 2.12.0
*/
public static boolean isFileOlder(final File file, final OffsetDateTime offsetDateTime) {
Objects.requireNonNull(offsetDateTime, "offsetDateTime");
return isFileOlder(file, offsetDateTime.toInstant());
}
/**
* Tests whether the specified {@link File} is a regular file or not. Implemented as a
* null-safe delegate to {@link Files#isRegularFile(Path path, LinkOption... options)}.
*
* @param file the path to the file.
* @param options options indicating how symbolic links are handled
* @return {@code true} if the file is a regular file; {@code false} if
* the path is null, the file does not exist, is not a regular file, or it cannot
* be determined if the file is a regular file or not.
* @throws SecurityException In the case of the default provider, and a security manager is installed, the
* {@link SecurityManager#checkRead(String) checkRead} method is invoked to check read
* access to the directory.
* @since 2.9.0
*/
public static boolean isRegularFile(final File file, final LinkOption... options) {
return file != null && Files.isRegularFile(file.toPath(), options);
}
/**
* Tests whether the specified file is a symbolic link rather than an actual file.
* <p>
* This method delegates to {@link Files#isSymbolicLink(Path path)}
* </p>
*
* @param file the file to test.
* @return true if the file is a symbolic link, see {@link Files#isSymbolicLink(Path path)}.
* @since 2.0
* @see Files#isSymbolicLink(Path)
*/
public static boolean isSymlink(final File file) {
return file != null && Files.isSymbolicLink(file.toPath());
}
/**
* Iterates over the files in given directory (and optionally
* its subdirectories).
* <p>
* The resulting iterator MUST be consumed in its entirety in order to close its underlying stream.
* </p>
* <p>
* All files found are filtered by an IOFileFilter.
* </p>
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return an iterator of {@link File} for the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 1.2
*/
public static Iterator<File> iterateFiles(final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
return listFiles(directory, fileFilter, dirFilter).iterator();
}
/**
* Iterates over the files in a given directory (and optionally
* its subdirectories) which match an array of extensions.
* <p>
* The resulting iterator MUST be consumed in its entirety in order to close its underlying stream.
* </p>
*
* @param directory the directory to search in
* @param extensions an array of extensions, for example, {"java","xml"}. If this
* parameter is {@code null}, all files are returned.
* @param recursive if true all subdirectories are searched as well
* @return an iterator of {@link File} with the matching files
* @since 1.2
*/
public static Iterator<File> iterateFiles(final File directory, final String[] extensions, final boolean recursive) {
return StreamIterator.iterator(Uncheck.get(() -> streamFiles(directory, recursive, extensions)));
}
/**
* Iterates over the files in given directory (and optionally
* its subdirectories).
* <p>
* The resulting iterator MUST be consumed in its entirety in order to close its underlying stream.
* </p>
* <p>
* All files found are filtered by an IOFileFilter.
* </p>
* <p>
* The resulting iterator includes the subdirectories themselves.
* </p>
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return an iterator of {@link File} for the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 2.2
*/
public static Iterator<File> iterateFilesAndDirs(final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
return listFilesAndDirs(directory, fileFilter, dirFilter).iterator();
}
/**
* Returns the last modification time in milliseconds via
* {@link java.nio.file.Files#getLastModifiedTime(Path, LinkOption...)}.
* <p>
* For the best precision, use {@link #lastModifiedFileTime(File)}.
* </p>
* <p>
* Use this method to avoid issues with {@link File#lastModified()} like
* <a href="https://bugs.openjdk.java.net/browse/JDK-8177809">JDK-8177809</a> where {@link File#lastModified()} is
* losing milliseconds (always ends in 000). This bug exists in OpenJDK 8 and 9, and is fixed in 10.
* </p>
*
* @param file The File to query.
* @return See {@link java.nio.file.attribute.FileTime#toMillis()}.
* @throws IOException if an I/O error occurs.
* @since 2.9.0
*/
public static long lastModified(final File file) throws IOException {
// https://bugs.openjdk.java.net/browse/JDK-8177809
// File.lastModified() is losing milliseconds (always ends in 000)
// This bug is in OpenJDK 8 and 9, and fixed in 10.
return lastModifiedFileTime(file).toMillis();
}
/**
* Returns the last modification {@link FileTime} via
* {@link java.nio.file.Files#getLastModifiedTime(Path, LinkOption...)}.
* <p>
* Use this method to avoid issues with {@link File#lastModified()} like
* <a href="https://bugs.openjdk.java.net/browse/JDK-8177809">JDK-8177809</a> where {@link File#lastModified()} is
* losing milliseconds (always ends in 000). This bug exists in OpenJDK 8 and 9, and is fixed in 10.
* </p>
*
* @param file The File to query.
* @return See {@link java.nio.file.Files#getLastModifiedTime(Path, LinkOption...)}.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static FileTime lastModifiedFileTime(final File file) throws IOException {
// https://bugs.openjdk.java.net/browse/JDK-8177809
// File.lastModified() is losing milliseconds (always ends in 000)
// This bug is in OpenJDK 8 and 9, and fixed in 10.
return Files.getLastModifiedTime(Objects.requireNonNull(file.toPath(), "file"));
}
/**
* Returns the last modification time in milliseconds via
* {@link java.nio.file.Files#getLastModifiedTime(Path, LinkOption...)}.
* <p>
* For the best precision, use {@link #lastModifiedFileTime(File)}.
* </p>
* <p>
* Use this method to avoid issues with {@link File#lastModified()} like
* <a href="https://bugs.openjdk.java.net/browse/JDK-8177809">JDK-8177809</a> where {@link File#lastModified()} is
* losing milliseconds (always ends in 000). This bug exists in OpenJDK 8 and 9, and is fixed in 10.
* </p>
*
* @param file The File to query.
* @return See {@link java.nio.file.attribute.FileTime#toMillis()}.
* @throws UncheckedIOException if an I/O error occurs.
* @since 2.9.0
*/
public static long lastModifiedUnchecked(final File file) {
// https://bugs.openjdk.java.net/browse/JDK-8177809
// File.lastModified() is losing milliseconds (always ends in 000)
// This bug is in OpenJDK 8 and 9, and fixed in 10.
return Uncheck.apply(FileUtils::lastModified, file);
}
/**
* Returns an Iterator for the lines in a {@link File} using the default encoding for the VM.
*
* @param file the file to open for input, must not be {@code null}
* @return an Iterator of the lines in the file, never {@code null}
* @throws NullPointerException if file is {@code null}.
* @throws FileNotFoundException if the file does not exist, is a directory rather than a regular file, or for some
* other reason cannot be opened for reading.
* @throws IOException if an I/O error occurs.
* @see #lineIterator(File, String)
* @since 1.3
*/
public static LineIterator lineIterator(final File file) throws IOException {
return lineIterator(file, null);
}
/**
* Returns an Iterator for the lines in a {@link File}.
* <p>
* This method opens an {@link InputStream} for the file.
* When you have finished with the iterator you should close the stream
* to free internal resources. This can be done by using a try-with-resources block or calling the
* {@link LineIterator#close()} method.
* </p>
* <p>
* The recommended usage pattern is:
* </p>
* <pre>
* LineIterator it = FileUtils.lineIterator(file, StandardCharsets.UTF_8.name());
* try {
* while (it.hasNext()) {
* String line = it.nextLine();
* /// do something with line
* }
* } finally {
* LineIterator.closeQuietly(iterator);
* }
* </pre>
* <p>
* If an exception occurs during the creation of the iterator, the
* underlying stream is closed.
* </p>
*
* @param file the file to open for input, must not be {@code null}
* @param charsetName the name of the requested charset, {@code null} means platform default
* @return a LineIterator for lines in the file, never {@code null}; MUST be closed by the caller.
* @throws NullPointerException if file is {@code null}.
* @throws FileNotFoundException if the file does not exist, is a directory rather than a regular file, or for some
* other reason cannot be opened for reading.
* @throws IOException if an I/O error occurs.
* @since 1.2
*/
@SuppressWarnings("resource") // Caller closes the result LineIterator.
public static LineIterator lineIterator(final File file, final String charsetName) throws IOException {
InputStream inputStream = null;
try {
inputStream = Files.newInputStream(file.toPath());
return IOUtils.lineIterator(inputStream, charsetName);
} catch (final IOException | RuntimeException ex) {
IOUtils.closeQuietly(inputStream, ex::addSuppressed);
throw ex;
}
}
private static AccumulatorPathVisitor listAccumulate(final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter,
final FileVisitOption... options) throws IOException {
final boolean isDirFilterSet = dirFilter != null;
final FileEqualsFileFilter rootDirFilter = new FileEqualsFileFilter(directory);
final PathFilter dirPathFilter = isDirFilterSet ? rootDirFilter.or(dirFilter) : rootDirFilter;
final AccumulatorPathVisitor visitor = new AccumulatorPathVisitor(Counters.noopPathCounters(), fileFilter, dirPathFilter,
(p, e) -> FileVisitResult.CONTINUE);
final Set<FileVisitOption> optionSet = new HashSet<>();
if (options != null) {
Collections.addAll(optionSet, options);
}
Files.walkFileTree(directory.toPath(), optionSet, toMaxDepth(isDirFilterSet), visitor);
return visitor;
}
/**
* Lists files in a directory, asserting that the supplied directory exists and is a directory.
*
* @param directory The directory to list
* @param fileFilter Optional file filter, may be null.
* @return The files in the directory, never {@code null}.
* @throws NullPointerException if directory is {@code null}.
* @throws IllegalArgumentException if {@link directory} exists but is not a directory
* @throws IOException if an I/O error occurs.
*/
private static File[] listFiles(final File directory, final FileFilter fileFilter) throws IOException {
requireDirectoryExists(directory, "directory");
final File[] files = fileFilter == null ? directory.listFiles() : directory.listFiles(fileFilter);
if (files == null) {
// null if the directory does not denote a directory, or if an I/O error occurs.
throw new IOException("Unknown I/O error listing contents of directory: " + directory);
}
return files;
}
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
* <p>
* If your search should recurse into subdirectories you can pass in
* an IOFileFilter for directories. You don't need to bind a
* DirectoryFileFilter (via logical AND) to this filter. This method does
* that for you.
* </p>
* <p>
* An example: If you want to search through all directories called
* "temp" you pass in {@code FileFilterUtils.NameFileFilter("temp")}
* </p>
* <p>
* Another common usage of this method is find files in a directory
* tree but ignoring the directories generated CVS. You can simply pass
* in {@code FileFilterUtils.makeCVSAware(null)}.
* </p>
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files. Must not be {@code null},
* use {@link TrueFileFilter#INSTANCE} to match all files in selected directories.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use {@link TrueFileFilter#INSTANCE} to match all directories.
* @return a collection of {@link File} with the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
*/
public static Collection<File> listFiles(final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
final AccumulatorPathVisitor visitor = Uncheck
.apply(d -> listAccumulate(d, FileFileFilter.INSTANCE.and(fileFilter), dirFilter, FileVisitOption.FOLLOW_LINKS), directory);
return toList(visitor.getFileList().stream().map(Path::toFile));
}
/**
* Lists files within a given directory (and optionally its subdirectories)
* which match an array of extensions.
*
* @param directory the directory to search in
* @param extensions an array of extensions, for example, {"java","xml"}. If this
* parameter is {@code null}, all files are returned.
* @param recursive if true all subdirectories are searched as well
* @return a collection of {@link File} with the matching files
*/
public static Collection<File> listFiles(final File directory, final String[] extensions, final boolean recursive) {
try (Stream<File> fileStream = Uncheck.get(() -> streamFiles(directory, recursive, extensions))) {
return toList(fileStream);
}
}
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
* <p>
* The resulting collection includes the starting directory and
* any subdirectories that match the directory filter.
* </p>
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return a collection of {@link File} with the matching files
* @see org.apache.commons.io.FileUtils#listFiles
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 2.2
*/
public static Collection<File> listFilesAndDirs(final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
final AccumulatorPathVisitor visitor = Uncheck.apply(d -> listAccumulate(d, fileFilter, dirFilter, FileVisitOption.FOLLOW_LINKS),
directory);
final List<Path> list = visitor.getFileList();
list.addAll(visitor.getDirList());
return toList(list.stream().map(Path::toFile));
}
/**
* Calls {@link File#mkdirs()} and throws an {@link IOException} on failure.
* <p>
* Creates all directories for a File object, including any necessary but non-existent parent directories. If the {@code directory} already exists or is
* null, nothing happens.
* </p>
*
* @param directory the receiver for {@code mkdirs()}. If the {@code directory} already exists or is null, nothing happens.
* @return the given directory.
* @throws IOException if the directory was not created along with all its parent directories.
* @throws IOException if the given file object is not a directory.
* @throws SecurityException See {@link File#mkdirs()}.
* @see File#mkdirs()
*/
private static File mkdirs(final File directory) throws IOException {
if (directory != null && !directory.mkdirs() && !directory.isDirectory()) {
throw new IOException("Cannot create directory '" + directory + "'.");
}
return directory;
}
/**
* Moves a directory.
* <p>
* When the destination directory is on another file system, do a "copy and delete".
* </p>
*
* @param srcDir the directory to be moved.
* @param destDir the destination directory.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if {@code srcDir} exists but is not a directory
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @since 1.4
*/
public static void moveDirectory(final File srcDir, final File destDir) throws IOException {
Objects.requireNonNull(destDir, "destination");
requireDirectoryExists(srcDir, "srcDir");
requireAbsent(destDir, "destDir");
if (!srcDir.renameTo(destDir)) {
if (destDir.getCanonicalPath().startsWith(srcDir.getCanonicalPath() + File.separator)) {
throw new IOException("Cannot move directory: " + srcDir + " to a subdirectory of itself: " + destDir);
}
copyDirectory(srcDir, destDir);
deleteDirectory(srcDir);
if (srcDir.exists()) {
throw new IOException("Failed to delete original directory '" + srcDir +
"' after copy to '" + destDir + "'");
}
}
}
/**
* Moves a directory to another directory.
* <p>
* If {@code createDestDir} is true, creates all destination parent directories, including any necessary but non-existent parent directories.
* </p>
*
* @param source the directory to be moved.
* @param destDir the destination file.
* @param createDestDir If {@code true} create the destination directory, otherwise if {@code false} throw an
* IOException.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws IllegalArgumentException if the source or destination is invalid.
* @throws FileNotFoundException if the source does not exist.
* @throws IOException if the directory was not created along with all its parent directories, if enabled.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @throws SecurityException See {@link File#mkdirs()}.
* @since 1.4
*/
public static void moveDirectoryToDirectory(final File source, final File destDir, final boolean createDestDir) throws IOException {
validateMoveParameters(source, destDir);
if (!destDir.isDirectory()) {
if (destDir.exists()) {
throw new IOException("Destination '" + destDir + "' is not a directory");
}
if (!createDestDir) {
throw new FileNotFoundException("Destination directory '" + destDir + "' does not exist [createDestDir=" + false + "]");
}
mkdirs(destDir);
}
moveDirectory(source, new File(destDir, source.getName()));
}
/**
* Moves a file preserving attributes.
* <p>
* Shorthand for {@code moveFile(srcFile, destFile, StandardCopyOption.COPY_ATTRIBUTES)}.
* </p>
* <p>
* When the destination file is on another file system, do a "copy and delete".
* </p>
*
* @param srcFile the file to be moved.
* @param destFile the destination file.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws FileExistsException if the destination file exists.
* @throws FileNotFoundException if the source file does not exist.
* @throws IllegalArgumentException if {@code srcFile} is a directory
* @throws IOException if an error occurs.
* @since 1.4
*/
public static void moveFile(final File srcFile, final File destFile) throws IOException {
moveFile(srcFile, destFile, StandardCopyOption.COPY_ATTRIBUTES);
}
/**
* Moves a file.
* <p>
* When the destination file is on another file system, do a "copy and delete".
* </p>
*
* @param srcFile the file to be moved.
* @param destFile the destination file.
* @param copyOptions Copy options.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws FileExistsException if the destination file exists.
* @throws FileNotFoundException if the source file does not exist.
* @throws IllegalArgumentException if {@code srcFile} is a directory
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @since 2.9.0
*/
public static void moveFile(final File srcFile, final File destFile, final CopyOption... copyOptions) throws IOException {
Objects.requireNonNull(destFile, "destination");
checkFileExists(srcFile, "srcFile");
requireAbsent(destFile, "destFile");
final boolean rename = srcFile.renameTo(destFile);
if (!rename) {
// Don't interfere with file date on move, handled by StandardCopyOption.COPY_ATTRIBUTES
copyFile(srcFile, destFile, false, copyOptions);
if (!srcFile.delete()) {
FileUtils.deleteQuietly(destFile);
throw new IOException("Failed to delete original file '" + srcFile + "' after copy to '" + destFile + "'");
}
}
}
/**
* Moves a file into a directory.
* <p>
* If {@code createDestDir} is true, creates all destination parent directories, including any necessary but non-existent parent directories.
* </p>
*
* @param srcFile the file to be moved.
* @param destDir the directory to move the file into
* @param createDestDir if {@code true} create the destination directory. If {@code false} throw an
* IOException if the destination directory does not already exist.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws FileExistsException if the destination file exists.
* @throws FileNotFoundException if the source file does not exist.
* @throws IOException if source or destination is invalid.
* @throws IOException if the directory was not created along with all its parent directories, if enabled.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @throws SecurityException See {@link File#mkdirs()}.
* @throws IllegalArgumentException if {@code destDir} exists but is not a directory
* @since 1.4
*/
public static void moveFileToDirectory(final File srcFile, final File destDir, final boolean createDestDir) throws IOException {
validateMoveParameters(srcFile, destDir);
if (!destDir.exists() && createDestDir) {
mkdirs(destDir);
}
requireDirectoryExists(destDir, "destDir");
moveFile(srcFile, new File(destDir, srcFile.getName()));
}
/**
* Moves a file or directory into a destination directory.
* <p>
* If {@code createDestDir} is true, creates all destination parent directories, including any necessary but non-existent parent directories.
* </p>
* <p>
* When the destination is on another file system, do a "copy and delete".
* </p>
*
* @param src the file or directory to be moved.
* @param destDir the destination directory.
* @param createDestDir if {@code true} create the destination directory. If {@code false} throw an
* IOException if the destination directory does not already exist.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws FileExistsException if the directory or file exists in the destination directory.
* @throws FileNotFoundException if the source file does not exist.
* @throws IOException if source or destination is invalid.
* @throws IOException if an error occurs or setting the last-modified time didn't succeed.
* @since 1.4
*/
public static void moveToDirectory(final File src, final File destDir, final boolean createDestDir) throws IOException {
validateMoveParameters(src, destDir);
if (src.isDirectory()) {
moveDirectoryToDirectory(src, destDir, createDestDir);
} else {
moveFileToDirectory(src, destDir, createDestDir);
}
}
/**
* Creates a new OutputStream by opening or creating a file, returning an output stream that may be used to write bytes
* to the file.
*
* @param append Whether or not to append.
* @param file the File.
* @return a new OutputStream.
* @throws IOException if an I/O error occurs.
* @see PathUtils#newOutputStream(Path, boolean)
* @since 2.12.0
*/
public static OutputStream newOutputStream(final File file, final boolean append) throws IOException {
return PathUtils.newOutputStream(Objects.requireNonNull(file, "file").toPath(), append);
}
/**
* Opens a {@link FileInputStream} for the specified file, providing better error messages than simply calling
* {@code new FileInputStream(file)}.
* <p>
* At the end of the method either the stream will be successfully opened, or an exception will have been thrown.
* </p>
* <p>
* An exception is thrown if the file does not exist. An exception is thrown if the file object exists but is a
* directory. An exception is thrown if the file exists but cannot be read.
* </p>
*
* @param file the file to open for input, must not be {@code null}
* @return a new {@link FileInputStream} for the specified file
* @throws NullPointerException if file is {@code null}.
* @throws FileNotFoundException if the file does not exist, is a directory rather than a regular file, or for some
* other reason cannot be opened for reading.
* @throws IOException See FileNotFoundException above, FileNotFoundException is a subclass of IOException.
* @since 1.3
*/
public static FileInputStream openInputStream(final File file) throws IOException {
Objects.requireNonNull(file, "file");
return new FileInputStream(file);
}
/**
* Opens a {@link FileOutputStream} for the specified file, checking and
* creating the parent directory if it does not exist.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* </p>
* <p>
* The parent directory will be created if it does not exist.
* The file will be created if it does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be written to.
* An exception is thrown if the parent directory cannot be created.
* </p>
*
* @param file the file to open for output, must not be {@code null}
* @return a new {@link FileOutputStream} for the specified file
* @throws NullPointerException if the file object is {@code null}.
* @throws IllegalArgumentException if the file object is a directory
* @throws IllegalArgumentException if the file is not writable.
* @throws IOException if the directories could not be created.
* @since 1.3
*/
public static FileOutputStream openOutputStream(final File file) throws IOException {
return openOutputStream(file, false);
}
/**
* Opens a {@link FileOutputStream} for the specified file, checking and
* creating the parent directory if it does not exist.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* </p>
* <p>
* The parent directory will be created if it does not exist.
* The file will be created if it does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be written to.
* An exception is thrown if the parent directory cannot be created.
* </p>
*
* @param file the file to open for output, must not be {@code null}
* @param append if {@code true}, then bytes will be added to the
* end of the file rather than overwriting
* @return a new {@link FileOutputStream} for the specified file
* @throws NullPointerException if the file object is {@code null}.
* @throws IllegalArgumentException if the file object is a directory
* @throws IOException if the directories could not be created, or the file is not writable
* @since 2.1
*/
public static FileOutputStream openOutputStream(final File file, final boolean append) throws IOException {
Objects.requireNonNull(file, "file");
if (file.exists()) {
checkIsFile(file, "file");
} else {
createParentDirectories(file);
}
return new FileOutputStream(file, append);
}
/**
* Reads the contents of a file into a byte array.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @return the file contents, never {@code null}
* @throws NullPointerException if file is {@code null}.
* @throws IOException if an I/O error occurs, including when the file does not exist, is a directory rather than a
* regular file, or for some other reason why the file cannot be opened for reading.
* @since 1.1
*/
public static byte[] readFileToByteArray(final File file) throws IOException {
Objects.requireNonNull(file, "file");
return Files.readAllBytes(file.toPath());
}
/**
* Reads the contents of a file into a String using the default encoding for the VM.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @return the file contents, never {@code null}
* @throws NullPointerException if file is {@code null}.
* @throws IOException if an I/O error occurs, including when the file does not exist, is a directory rather than a
* regular file, or for some other reason why the file cannot be opened for reading.
* @since 1.3.1
* @deprecated Use {@link #readFileToString(File, Charset)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static String readFileToString(final File file) throws IOException {
return readFileToString(file, Charset.defaultCharset());
}
/**
* Reads the contents of a file into a String.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @param charsetName the name of the requested charset, {@code null} means platform default
* @return the file contents, never {@code null}
* @throws NullPointerException if file is {@code null}.
* @throws IOException if an I/O error occurs, including when the file does not exist, is a directory rather than a
* regular file, or for some other reason why the file cannot be opened for reading.
* @since 2.3
*/
public static String readFileToString(final File file, final Charset charsetName) throws IOException {
return IOUtils.toString(() -> Files.newInputStream(file.toPath()), Charsets.toCharset(charsetName));
}
/**
* Reads the contents of a file into a String. The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @param charsetName the name of the requested charset, {@code null} means platform default
* @return the file contents, never {@code null}
* @throws NullPointerException if file is {@code null}.
* @throws IOException if an I/O error occurs, including when the file does not exist, is a directory rather than a
* regular file, or for some other reason why the file cannot be opened for reading.
* @throws java.nio.charset.UnsupportedCharsetException if the named charset is unavailable.
* @since 2.3
*/
public static String readFileToString(final File file, final String charsetName) throws IOException {
return readFileToString(file, Charsets.toCharset(charsetName));
}
/**
* Reads the contents of a file line by line to a List of Strings using the default encoding for the VM.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @return the list of Strings representing each line in the file, never {@code null}
* @throws NullPointerException if file is {@code null}.
* @throws IOException if an I/O error occurs, including when the file does not exist, is a directory rather than a
* regular file, or for some other reason why the file cannot be opened for reading.
* @since 1.3
* @deprecated Use {@link #readLines(File, Charset)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static List<String> readLines(final File file) throws IOException {
return readLines(file, Charset.defaultCharset());
}
/**
* Reads the contents of a file line by line to a List of Strings.
* The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @param charset the charset to use, {@code null} means platform default
* @return the list of Strings representing each line in the file, never {@code null}
* @throws NullPointerException if file is {@code null}.
* @throws IOException if an I/O error occurs, including when the file does not exist, is a directory rather than a
* regular file, or for some other reason why the file cannot be opened for reading.
* @since 2.3
*/
public static List<String> readLines(final File file, final Charset charset) throws IOException {
return Files.readAllLines(file.toPath(), charset);
}
/**
* Reads the contents of a file line by line to a List of Strings. The file is always closed.
*
* @param file the file to read, must not be {@code null}
* @param charsetName the name of the requested charset, {@code null} means platform default
* @return the list of Strings representing each line in the file, never {@code null}
* @throws NullPointerException if file is {@code null}.
* @throws IOException if an I/O error occurs, including when the file does not exist, is a directory rather than a
* regular file, or for some other reason why the file cannot be opened for reading.
* @throws java.nio.charset.UnsupportedCharsetException if the named charset is unavailable.
* @since 1.1
*/
public static List<String> readLines(final File file, final String charsetName) throws IOException {
return readLines(file, Charsets.toCharset(charsetName));
}
private static void requireAbsent(final File file, final String name) throws FileExistsException {
if (file.exists()) {
throw new FileExistsException(String.format("File element in parameter '%s' already exists: '%s'", name, file));
}
}
/**
* Throws IllegalArgumentException if the given files' canonical representations are equal.
*
* @param file1 The first file to compare.
* @param file2 The second file to compare.
* @throws IOException if an I/O error occurs.
* @throws IllegalArgumentException if the given files' canonical representations are equal.
*/
private static void requireCanonicalPathsNotEquals(final File file1, final File file2) throws IOException {
final String canonicalPath = file1.getCanonicalPath();
if (canonicalPath.equals(file2.getCanonicalPath())) {
throw new IllegalArgumentException(String
.format("File canonical paths are equal: '%s' (file1='%s', file2='%s')", canonicalPath, file1, file2));
}
}
/**
* Requires that the given {@link File} exists and is a directory.
*
* @param directory The {@link File} to check.
* @param name The parameter name to use in the exception message in case of null input or if the file is not a directory.
* @throws NullPointerException if the given {@link File} is {@code null}.
* @throws FileNotFoundException if the given {@link File} does not exist
* @throws IllegalArgumentException if the given {@link File} exists but is not a directory.
*/
private static void requireDirectoryExists(final File directory, final String name) throws FileNotFoundException {
Objects.requireNonNull(directory, name);
if (!directory.isDirectory()) {
if (directory.exists()) {
throw new IllegalArgumentException("Parameter '" + name + "' is not a directory: '" + directory + "'");
}
throw new FileNotFoundException("Directory '" + directory + "' does not exist.");
}
}
/**
* Requires that the given {@link File} is a directory if it exists.
*
* @param directory The {@link File} to check.
* @param name The parameter name to use in the exception message in case of null input.
* @throws NullPointerException if the given {@link File} is {@code null}.
* @throws IllegalArgumentException if the given {@link File} exists but is not a directory.
*/
private static void requireDirectoryIfExists(final File directory, final String name) throws FileNotFoundException {
Objects.requireNonNull(directory, name);
if (directory.exists() && !directory.isDirectory()) {
throw new IllegalArgumentException("Parameter '" + name + "' is not a directory: '" + directory + "'");
}
}
/**
* Sets file lastModifiedTime, lastAccessTime and creationTime to match source file
*
* @param sourceFile The source file to query.
* @param targetFile The target file or directory to set.
* @return {@code true} if and only if the operation succeeded;
* {@code false} otherwise
* @throws NullPointerException if sourceFile is {@code null}.
* @throws NullPointerException if targetFile is {@code null}.
*/
private static boolean setTimes(final File sourceFile, final File targetFile) {
Objects.requireNonNull(sourceFile, "sourceFile");
Objects.requireNonNull(targetFile, "targetFile");
try {
// Set creation, modified, last accessed to match source file
final BasicFileAttributes srcAttr = Files.readAttributes(sourceFile.toPath(), BasicFileAttributes.class);
final BasicFileAttributeView destAttrView = Files.getFileAttributeView(targetFile.toPath(), BasicFileAttributeView.class);
// null guards are not needed; BasicFileAttributes.setTimes(...) is null safe
destAttrView.setTimes(srcAttr.lastModifiedTime(), srcAttr.lastAccessTime(), srcAttr.creationTime());
return true;
} catch (final IOException ignored) {
// Fallback: Only set modified time to match source file
return targetFile.setLastModified(sourceFile.lastModified());
}
// TODO: (Help!) Determine historically why setLastModified(File, File) needed PathUtils.setLastModifiedTime() if
// sourceFile.isFile() was true, but needed setLastModifiedTime(File, long) if sourceFile.isFile() was false
}
/**
* Returns the size of the specified file or directory. If the provided
* {@link File} is a regular file, then the file's length is returned.
* If the argument is a directory, then the size of the directory is
* calculated recursively. If a directory or subdirectory is security
* restricted, its size will not be included.
* <p>
* Note that overflow is not detected, and the return value may be negative if
* overflow occurs. See {@link #sizeOfAsBigInteger(File)} for an alternative
* method that does not overflow.
* </p>
*
* @param file the regular file or directory to return the size
* of (must not be {@code null}).
*
* @return the length of the file, or recursive size of the directory,
* provided (in bytes).
*
* @throws NullPointerException if the file is {@code null}.
* @throws IllegalArgumentException if the file does not exist.
* @throws UncheckedIOException if an IO error occurs.
* @since 2.0
*/
public static long sizeOf(final File file) {
return Uncheck.get(() -> PathUtils.sizeOf(file.toPath()));
}
/**
* Returns the size of the specified file or directory. If the provided
* {@link File} is a regular file, then the file's length is returned.
* If the argument is a directory, then the size of the directory is
* calculated recursively. If a directory or subdirectory is security
* restricted, its size will not be included.
*
* @param file the regular file or directory to return the size
* of (must not be {@code null}).
*
* @return the length of the file, or recursive size of the directory,
* provided (in bytes).
*
* @throws NullPointerException if the file is {@code null}.
* @throws IllegalArgumentException if the file does not exist.
* @throws UncheckedIOException if an IO error occurs.
* @since 2.4
*/
public static BigInteger sizeOfAsBigInteger(final File file) {
return Uncheck.get(() -> PathUtils.sizeOfAsBigInteger(file.toPath()));
}
/**
* Counts the size of a directory recursively (sum of the length of all files).
* <p>
* Note that overflow is not detected, and the return value may be negative if
* overflow occurs. See {@link #sizeOfDirectoryAsBigInteger(File)} for an alternative
* method that does not overflow.
* </p>
*
* @param directory directory to inspect, must not be {@code null}.
* @return size of directory in bytes, 0 if directory is security restricted, a negative number when the real total
* is greater than {@link Long#MAX_VALUE}.
* @throws IllegalArgumentException if the given {@link File} exists but is not a directory
* @throws NullPointerException if the directory is {@code null}.
* @throws UncheckedIOException if an IO error occurs.
*/
public static long sizeOfDirectory(final File directory) {
try {
requireDirectoryExists(directory, "directory");
} catch (final FileNotFoundException e) {
throw new UncheckedIOException(e);
}
return Uncheck.get(() -> PathUtils.sizeOfDirectory(directory.toPath()));
}
/**
* Counts the size of a directory recursively (sum of the length of all files).
*
* @param directory directory to inspect, must not be {@code null}.
* @return size of directory in bytes, 0 if directory is security restricted.
* @throws IllegalArgumentException if the given {@link File} exists but is not a directory
* @throws NullPointerException if the directory is {@code null}.
* @throws UncheckedIOException if an IO error occurs.
* @since 2.4
*/
public static BigInteger sizeOfDirectoryAsBigInteger(final File directory) {
try {
requireDirectoryExists(directory, "directory");
} catch (final FileNotFoundException e) {
throw new UncheckedIOException(e);
}
return Uncheck.get(() -> PathUtils.sizeOfDirectoryAsBigInteger(directory.toPath()));
}
/**
* Streams over the files in a given directory (and optionally its subdirectories) which match an array of extensions.
* <p>
* The returned {@link Stream} may wrap one or more {@link DirectoryStream}s. When you require timely disposal of file system resources, use a
* {@code try}-with-resources block to ensure invocation of the stream's {@link Stream#close()} method after the stream operations are completed. Calling a
* closed stream causes a {@link IllegalStateException}.
* </p>
*
* @param directory the directory to search in
* @param recursive if true all subdirectories are searched as well
* @param extensions an array of extensions, for example, {"java","xml"}. If this parameter is {@code null}, all files are returned.
* @return a Stream of {@link File} for matching files.
* @throws IOException if an I/O error is thrown when accessing the starting file.
* @since 2.9.0
*/
public static Stream<File> streamFiles(final File directory, final boolean recursive, final String... extensions) throws IOException {
// @formatter:off
final IOFileFilter filter = extensions == null
? FileFileFilter.INSTANCE
: FileFileFilter.INSTANCE.and(new SuffixFileFilter(toSuffixes(extensions)));
// @formatter:on
return PathUtils.walk(directory.toPath(), filter, toMaxDepth(recursive), false, FileVisitOption.FOLLOW_LINKS).map(Path::toFile);
}
/**
* Converts from a {@link URL} to a {@link File}.
* <p>
* Syntax such as {@code file:///my%20docs/file.txt} will be
* correctly decoded to {@code /my docs/file.txt}.
* UTF-8 is used to decode percent-encoded octets to characters.
* Additionally, malformed percent-encoded octets are handled leniently by
* passing them through literally.
* </p>
*
* @param url the file URL to convert, {@code null} returns {@code null}
* @return the equivalent {@link File} object, or {@code null}
* if the URL's protocol is not {@code file}
*/
public static File toFile(final URL url) {
if (url == null || !"file".equalsIgnoreCase(url.getProtocol())) {
return null;
}
final String fileName = url.getFile().replace('/', File.separatorChar);
return new File(decodeUrl(fileName));
}
/**
* Converts each of an array of {@link URL} to a {@link File}.
* <p>
* Returns an array of the same size as the input.
* If the input is {@code null}, an empty array is returned.
* If the input contains {@code null}, the output array contains {@code null} at the same
* index.
* </p>
* <p>
* This method will decode the URL.
* Syntax such as {@code file:///my%20docs/file.txt} will be
* correctly decoded to {@code /my docs/file.txt}.
* </p>
*
* @param urls the file URLs to convert, {@code null} returns empty array
* @return a non-{@code null} array of Files matching the input, with a {@code null} item
* if there was a {@code null} at that index in the input array
* @throws IllegalArgumentException if any file is not a URL file
* @throws IllegalArgumentException if any file is incorrectly encoded
* @since 1.1
*/
public static File[] toFiles(final URL... urls) {
if (IOUtils.length(urls) == 0) {
return EMPTY_FILE_ARRAY;
}
final File[] files = new File[urls.length];
for (int i = 0; i < urls.length; i++) {
final URL url = urls[i];
if (url != null) {
if (!"file".equalsIgnoreCase(url.getProtocol())) {
throw new IllegalArgumentException("Can only convert file URL to a File: " + url);
}
files[i] = toFile(url);
}
}
return files;
}
/**
* Consumes all of the given stream.
* <p>
* When called from a FileTreeWalker, the walker <em>closes</em> the stream because {@link FileTreeWalker#next()} calls {@code top.stream().close()}.
* </p>
*
* @param stream The stream to consume.
* @return a new List.
*/
private static List<File> toList(final Stream<File> stream) {
return stream.collect(Collectors.toList());
}
/**
* Converts whether or not to recurse into a recursion max depth.
*
* @param recursive whether or not to recurse
* @return the recursion depth
*/
private static int toMaxDepth(final boolean recursive) {
return recursive ? Integer.MAX_VALUE : 1;
}
/**
* Converts an array of file extensions to suffixes.
*
* @param extensions an array of extensions. Format: {"java", "xml"}
* @return an array of suffixes. Format: {".java", ".xml"}
* @throws NullPointerException if the parameter is null
*/
private static String[] toSuffixes(final String... extensions) {
return Stream.of(Objects.requireNonNull(extensions, "extensions")).map(e -> "." + e).toArray(String[]::new);
}
/**
* Implements behavior similar to the UNIX "touch" utility. Creates a new file with size 0, or, if the file exists, just
* updates the file's modified time. This method throws an IOException if the last modified date
* of the file cannot be set. It creates parent directories if they do not exist.
*
* @param file the File to touch.
* @throws NullPointerException if the parameter is {@code null}.
* @throws IOException if setting the last-modified time failed or an I/O problem occurs.
*/
public static void touch(final File file) throws IOException {
PathUtils.touch(Objects.requireNonNull(file, "file").toPath());
}
/**
* Converts each element of an array of {@link File} to a {@link URL}.
* <p>
* Returns an array of the same size as the input.
* </p>
*
* @param files the files to convert, must not be {@code null}
* @return an array of URLs matching the input
* @throws IOException if a file cannot be converted
* @throws NullPointerException if any argument is null
*/
public static URL[] toURLs(final File... files) throws IOException {
Objects.requireNonNull(files, "files");
final URL[] urls = new URL[files.length];
for (int i = 0; i < urls.length; i++) {
urls[i] = files[i].toURI().toURL();
}
return urls;
}
/**
* Validates the given arguments.
* <ul>
* <li>Throws {@link NullPointerException} if {@code source} is null</li>
* <li>Throws {@link NullPointerException} if {@code destination} is null</li>
* <li>Throws {@link FileNotFoundException} if {@code source} does not exist</li>
* </ul>
*
* @param source the file or directory to be moved.
* @param destination the destination file or directory.
* @throws NullPointerException if any of the given {@link File}s are {@code null}.
* @throws FileNotFoundException if the source file does not exist.
*/
private static void validateMoveParameters(final File source, final File destination) throws FileNotFoundException {
Objects.requireNonNull(source, "source");
Objects.requireNonNull(destination, "destination");
if (!source.exists()) {
throw new FileNotFoundException("Source '" + source + "' does not exist");
}
}
/**
* Waits for the file system to propagate a file creation, with a timeout.
* <p>
* This method repeatedly tests {@link Files#exists(Path, LinkOption...)} until it returns
* true up to the maximum time specified in seconds.
* </p>
*
* @param file the file to check, must not be {@code null}
* @param seconds the maximum time in seconds to wait
* @return true if file exists
* @throws NullPointerException if the file is {@code null}
*/
public static boolean waitFor(final File file, final int seconds) {
Objects.requireNonNull(file, "file");
return PathUtils.waitFor(file.toPath(), Duration.ofSeconds(seconds), PathUtils.EMPTY_LINK_OPTION_ARRAY);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @throws IOException in case of an I/O error
* @since 2.0
* @deprecated Use {@link #write(File, CharSequence, Charset)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static void write(final File file, final CharSequence data) throws IOException {
write(file, data, Charset.defaultCharset(), false);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @param append if {@code true}, then the data will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
* @deprecated Use {@link #write(File, CharSequence, Charset, boolean)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static void write(final File file, final CharSequence data, final boolean append) throws IOException {
write(file, data, Charset.defaultCharset(), append);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param charset the name of the requested charset, {@code null} means platform default
* @throws IOException in case of an I/O error
* @since 2.3
*/
public static void write(final File file, final CharSequence data, final Charset charset) throws IOException {
write(file, data, charset, false);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param charset the charset to use, {@code null} means platform default
* @param append if {@code true}, then the data will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.3
*/
public static void write(final File file, final CharSequence data, final Charset charset, final boolean append) throws IOException {
writeStringToFile(file, Objects.toString(data, null), charset, append);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param charsetName the name of the requested charset, {@code null} means platform default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.0
*/
public static void write(final File file, final CharSequence data, final String charsetName) throws IOException {
write(file, data, charsetName, false);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param charsetName the name of the requested charset, {@code null} means platform default
* @param append if {@code true}, then the data will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.nio.charset.UnsupportedCharsetException if the encoding is not supported by the VM
* @since 2.1
*/
public static void write(final File file, final CharSequence data, final String charsetName, final boolean append) throws IOException {
write(file, data, Charsets.toCharset(charsetName), append);
}
// Must be called with a directory
/**
* Writes a byte array to a file creating the file if it does not exist.
* The parent directories of the file will be created if they do not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @throws IOException in case of an I/O error
* @since 1.1
*/
public static void writeByteArrayToFile(final File file, final byte[] data) throws IOException {
writeByteArrayToFile(file, data, false);
}
/**
* Writes a byte array to a file creating the file if it does not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @param append if {@code true}, then bytes will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeByteArrayToFile(final File file, final byte[] data, final boolean append) throws IOException {
writeByteArrayToFile(file, data, 0, data.length, append);
}
/**
* Writes {@code len} bytes from the specified byte array starting
* at offset {@code off} to a file, creating the file if it does
* not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @param off the start offset in the data
* @param len the number of bytes to write
* @throws IOException in case of an I/O error
* @since 2.5
*/
public static void writeByteArrayToFile(final File file, final byte[] data, final int off, final int len) throws IOException {
writeByteArrayToFile(file, data, off, len, false);
}
/**
* Writes {@code len} bytes from the specified byte array starting
* at offset {@code off} to a file, creating the file if it does
* not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @param off the start offset in the data
* @param len the number of bytes to write
* @param append if {@code true}, then bytes will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.5
*/
public static void writeByteArrayToFile(final File file, final byte[] data, final int off, final int len, final boolean append) throws IOException {
try (OutputStream out = newOutputStream(file, append)) {
out.write(data, off, len);
}
}
/**
* Writes the {@code toString()} value of each item in a collection to
* the specified {@link File} line by line.
* The default VM encoding and the default line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, {@code null} entries produce blank lines
* @throws IOException in case of an I/O error
* @since 1.3
*/
public static void writeLines(final File file, final Collection<?> lines) throws IOException {
writeLines(file, null, lines, null, false);
}
/**
* Writes the {@code toString()} value of each item in a collection to
* the specified {@link File} line by line.
* The default VM encoding and the default line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, {@code null} entries produce blank lines
* @param append if {@code true}, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeLines(final File file, final Collection<?> lines, final boolean append) throws IOException {
writeLines(file, null, lines, null, append);
}
/**
* Writes the {@code toString()} value of each item in a collection to
* the specified {@link File} line by line.
* The default VM encoding and the specified line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, {@code null} entries produce blank lines
* @param lineEnding the line separator to use, {@code null} is system default
* @throws IOException in case of an I/O error
* @since 1.3
*/
public static void writeLines(final File file, final Collection<?> lines, final String lineEnding) throws IOException {
writeLines(file, null, lines, lineEnding, false);
}
/**
* Writes the {@code toString()} value of each item in a collection to
* the specified {@link File} line by line.
* The default VM encoding and the specified line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, {@code null} entries produce blank lines
* @param lineEnding the line separator to use, {@code null} is system default
* @param append if {@code true}, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeLines(final File file, final Collection<?> lines, final String lineEnding, final boolean append) throws IOException {
writeLines(file, null, lines, lineEnding, append);
}
/**
* Writes the {@code toString()} value of each item in a collection to
* the specified {@link File} line by line.
* The specified character encoding and the default line ending will be used.
* The parent directories of the file will be created if they do not exist.
*
* @param file the file to write to
* @param charsetName the name of the requested charset, {@code null} means platform default
* @param lines the lines to write, {@code null} entries produce blank lines
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 1.1
*/
public static void writeLines(final File file, final String charsetName, final Collection<?> lines) throws IOException {
writeLines(file, charsetName, lines, null, false);
}
/**
* Writes the {@code toString()} value of each item in a collection to
* the specified {@link File} line by line, optionally appending.
* The specified character encoding and the default line ending will be used.
*
* @param file the file to write to
* @param charsetName the name of the requested charset, {@code null} means platform default
* @param lines the lines to write, {@code null} entries produce blank lines
* @param append if {@code true}, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeLines(final File file, final String charsetName, final Collection<?> lines, final boolean append) throws IOException {
writeLines(file, charsetName, lines, null, append);
}
/**
* Writes the {@code toString()} value of each item in a collection to
* the specified {@link File} line by line.
* The specified character encoding and the line ending will be used.
* The parent directories of the file will be created if they do not exist.
*
* @param file the file to write to
* @param charsetName the name of the requested charset, {@code null} means platform default
* @param lines the lines to write, {@code null} entries produce blank lines
* @param lineEnding the line separator to use, {@code null} is system default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 1.1
*/
public static void writeLines(final File file, final String charsetName, final Collection<?> lines, final String lineEnding) throws IOException {
writeLines(file, charsetName, lines, lineEnding, false);
}
/**
* Writes the {@code toString()} value of each item in a collection to
* the specified {@link File} line by line.
* The specified character encoding and the line ending will be used.
*
* @param file the file to write to
* @param charsetName the name of the requested charset, {@code null} means platform default
* @param lines the lines to write, {@code null} entries produce blank lines
* @param lineEnding the line separator to use, {@code null} is system default
* @param append if {@code true}, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeLines(final File file, final String charsetName, final Collection<?> lines, final String lineEnding, final boolean append)
throws IOException {
try (OutputStream out = new BufferedOutputStream(newOutputStream(file, append))) {
IOUtils.writeLines(lines, lineEnding, out, charsetName);
}
}
/**
* Writes a String to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @throws IOException in case of an I/O error
* @deprecated Use {@link #writeStringToFile(File, String, Charset)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static void writeStringToFile(final File file, final String data) throws IOException {
writeStringToFile(file, data, Charset.defaultCharset(), false);
}
/**
* Writes a String to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @param append if {@code true}, then the String will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
* @deprecated Use {@link #writeStringToFile(File, String, Charset, boolean)} instead (and specify the appropriate encoding)
*/
@Deprecated
public static void writeStringToFile(final File file, final String data, final boolean append) throws IOException {
writeStringToFile(file, data, Charset.defaultCharset(), append);
}
/**
* Writes a String to a file creating the file if it does not exist.
* The parent directories of the file will be created if they do not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param charset the charset to use, {@code null} means platform default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.4
*/
public static void writeStringToFile(final File file, final String data, final Charset charset) throws IOException {
writeStringToFile(file, data, charset, false);
}
/**
* Writes a String to a file, creating the file if it does not exist.
* The parent directories of the file are created if they do not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param charset the charset to use, {@code null} means platform default
* @param append if {@code true}, then the String will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.3
*/
public static void writeStringToFile(final File file, final String data, final Charset charset, final boolean append) throws IOException {
try (OutputStream out = newOutputStream(file, append)) {
IOUtils.write(data, out, charset);
}
}
/**
* Writes a String to a file, creating the file if it does not exist.
* The parent directories of the file are created if they do not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param charsetName the name of the requested charset, {@code null} means platform default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
*/
public static void writeStringToFile(final File file, final String data, final String charsetName) throws IOException {
writeStringToFile(file, data, charsetName, false);
}
/**
* Writes a String to a file, creating the file if it does not exist.
* The parent directories of the file are created if they do not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param charsetName the name of the requested charset, {@code null} means platform default
* @param append if {@code true}, then the String will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.nio.charset.UnsupportedCharsetException if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeStringToFile(final File file, final String data, final String charsetName, final boolean append) throws IOException {
writeStringToFile(file, data, Charsets.toCharset(charsetName), append);
}
/**
* Instances should NOT be constructed in standard programming.
*
* @deprecated TODO Make private in 3.0.
*/
@Deprecated
public FileUtils() { //NOSONAR
// empty
}
}