Package org.apache.commons.io.filefilter
Class EmptyFileFilter
java.lang.Object
org.apache.commons.io.filefilter.AbstractFileFilter
org.apache.commons.io.filefilter.EmptyFileFilter
- All Implemented Interfaces:
FileFilter
,FilenameFilter
,Serializable
,FileVisitor<Path>
,PathMatcher
,PathFilter
,PathVisitor
,IOFileFilter
This filter accepts files or directories that are empty.
If the File
is a directory it checks that it contains no files.
Example, showing how to print out a list of the current directory's empty files/directories:
Using Classic IO
File dir = FileUtils.current(); String[] files = dir.list(EmptyFileFilter.EMPTY); for (String file : files) { System.out.println(file); }
Example, showing how to print out a list of the current directory's non-empty files/directories:
File dir = FileUtils.current(); String[] files = dir.list(EmptyFileFilter.NOT_EMPTY); for (String file : files) { System.out.println(file); }
Using NIO
final Path dir = PathUtils.current(); final AccumulatorPathVisitor visitor = AccumulatorPathVisitor.withLongCounters(EmptyFileFilter.EMPTY); // // Walk one directory Files.walkFileTree(dir, Collections.emptySet(), 1, visitor); System.out.println(visitor.getPathCounters()); System.out.println(visitor.getFileList()); // visitor.getPathCounters().reset(); // // Walk directory tree Files.walkFileTree(dir, visitor); System.out.println(visitor.getPathCounters()); System.out.println(visitor.getDirList()); System.out.println(visitor.getFileList());
Deprecating Serialization
Serialization is deprecated and will be removed in 3.0.
- Since:
- 1.3
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final IOFileFilter
Singleton instance of empty filterstatic final IOFileFilter
Singleton instance of not-empty filterFields inherited from interface org.apache.commons.io.filefilter.IOFileFilter
EMPTY_STRING_ARRAY
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionboolean
Checks to see if the file is empty.accept
(Path file, BasicFileAttributes attributes) Checks to see if the file is empty.Methods inherited from class org.apache.commons.io.filefilter.AbstractFileFilter
accept, handle, postVisitDirectory, preVisitDirectory, toString, visitFile, visitFileFailed
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.apache.commons.io.filefilter.IOFileFilter
and, matches, negate, or
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Field Details
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EMPTY
Singleton instance of empty filter -
NOT_EMPTY
Singleton instance of not-empty filter
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Constructor Details
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EmptyFileFilter
protected EmptyFileFilter()Restrictive constructor.
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Method Details
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accept
Checks to see if the file is empty.- Specified by:
accept
in interfaceFileFilter
- Specified by:
accept
in interfaceIOFileFilter
- Overrides:
accept
in classAbstractFileFilter
- Parameters:
file
- the file or directory to check- Returns:
true
if the file or directory is empty, otherwisefalse
.
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accept
Checks to see if the file is empty.- Specified by:
accept
in interfaceIOFileFilter
- Specified by:
accept
in interfacePathFilter
- Parameters:
file
- the file or directory to checkattributes
- the path's basic attributes (may be null).- Returns:
true
if the file or directory is empty, otherwisefalse
.- Since:
- 2.9.0
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