SharedFunctions.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.release.plugin;
import java.io.File;
import java.io.IOException;
import java.util.Optional;
import java.util.function.Supplier;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.scm.provider.ScmProviderRepository;
import org.apache.maven.settings.Server;
import org.apache.maven.settings.Settings;
import org.apache.maven.settings.crypto.DefaultSettingsDecryptionRequest;
import org.apache.maven.settings.crypto.SettingsDecrypter;
import org.apache.maven.settings.crypto.SettingsDecryptionResult;
import org.codehaus.plexus.util.FileUtils;
/**
* Shared static functions for all of our Mojos.
*
* @since 1.0
*/
public final class SharedFunctions {
/**
* I want a buffer that is an array with 1024 elements of bytes. We declare
* the constant here for the sake of making the code more readable.
*/
public static final int BUFFER_BYTE_SIZE = 1024;
/**
* Copies a {@link File} from the <code>fromFile</code> to the <code>toFile</code> and logs the failure
* using the Maven {@link Log}.
*
* @param log the {@link Log}, the maven logger.
* @param fromFile the {@link File} from which to copy.
* @param toFile the {@link File} to which to copy into.
* @throws MojoExecutionException if an {@link IOException} or {@link NullPointerException} is caught.
*/
public static void copyFile(final Log log, final File fromFile, final File toFile) throws MojoExecutionException {
final String format = "Unable to copy file %s to %s: %s";
requireNonNull(fromFile, () -> String.format(format, fromFile, toFile));
requireNonNull(toFile, () -> String.format(format, fromFile, toFile));
try {
FileUtils.copyFile(fromFile, toFile);
} catch (final IOException e) {
final String message = String.format(format, fromFile, toFile, e.getMessage());
log.error(message);
throw new MojoExecutionException(message, e);
}
}
/**
* Cleans and then initializes an empty directory that is given by the <code>workingDirectory</code>
* parameter.
*
* @param log is the Maven log for output logging, particularly in regards to error management.
* @param workingDirectory is a {@link File} that represents the directory to first attempt to delete then create.
* @throws MojoExecutionException when an {@link IOException} or {@link NullPointerException} is caught for the
* purpose of bubbling the exception up to Maven properly.
*/
public static void initDirectory(final Log log, final File workingDirectory) throws MojoExecutionException {
final String format = "Unable to remove directory %s: %s";
requireNonNull(workingDirectory, () -> String.format(format, workingDirectory));
if (workingDirectory.exists()) {
try {
FileUtils.deleteDirectory(workingDirectory);
} catch (final IOException e) {
final String message = String.format(format, workingDirectory, e.getMessage());
log.error(message);
throw new MojoExecutionException(message, e);
}
}
if (!workingDirectory.exists()) {
workingDirectory.mkdirs();
}
}
/**
* Checks that the specified object reference is not {@code null}. This method is designed primarily for doing parameter validation in methods and
* constructors, as demonstrated below: <blockquote>
*
* <pre>
* public Foo(Bar bar) {
* this.bar = SharedFunctions.requireNonNull(bar);
* }
* </pre>
*
* </blockquote>
*
* @param obj the object reference to check for nullity
* @param <T> the type of the reference
* @return {@code obj} if not {@code null}
* @throws MojoExecutionException if {@code obj} is {@code null}
*/
public static <T> T requireNonNull(final T obj) throws MojoExecutionException {
if (obj == null) {
throw new MojoExecutionException(new NullPointerException());
}
return obj;
}
/**
* Checks that the specified object reference is not {@code null} and throws a customized {@link MojoExecutionException} if it is. This method is designed
* primarily for doing parameter validation in methods and constructors with multiple parameters, as demonstrated below: <blockquote>
*
* <pre>
* public Foo(Bar bar, Baz baz) {
* this.bar = SharedFunctions.requireNonNull(bar, "bar must not be null");
* this.baz = SharedFunctions.requireNonNull(baz, "baz must not be null");
* }
* </pre>
*
* </blockquote>
*
* @param obj the object reference to check for nullity
* @param message detail message to be used in the event that a {@code
* NullPointerException} is thrown
* @param <T> the type of the reference
* @return {@code obj} if not {@code null}
* @throws MojoExecutionException if {@code obj} is {@code null}
*/
public static <T> T requireNonNull(final T obj, final String message) throws MojoExecutionException {
if (obj == null) {
throw new MojoExecutionException(new NullPointerException(message));
}
return obj;
}
/**
* Checks that the specified object reference is not {@code null} and throws a customized {@link MojoExecutionException} if it is.
* <p>
* Unlike the method {@link #requireNonNull(Object, String)}, this method allows creation of the message to be deferred until after the null check is made.
* While this may confer a performance advantage in the non-null case, when deciding to call this method care should be taken that the costs of creating the
* message supplier are less than the cost of just creating the string message directly.
* </p>
*
* @param obj the object reference to check for nullity
* @param messageSupplier supplier of the detail message to be used in the event that a {@code NullPointerException} is thrown
* @param <T> the type of the reference
* @return {@code obj} if not {@code null}
* @throws MojoExecutionException if {@code obj} is {@code null}
*/
public static <T> T requireNonNull(final T obj, final Supplier<String> messageSupplier) throws MojoExecutionException {
if (obj == null) {
throw new MojoExecutionException(new NullPointerException(messageSupplier.get()));
}
return obj;
}
/**
* Sets authentication information on the specified {@link ScmProviderRepository}.
*
* @param providerRepository target.
* @param distServer temp.
* @param settings temp.
* @param settingsDecrypter temp.
* @param username temp.
* @param password temp.
*/
public static void setAuthentication(final ScmProviderRepository providerRepository,
final String distServer,
final Settings settings,
final SettingsDecrypter settingsDecrypter,
final String username,
final String password) {
final Optional<Server> server =
Optional.ofNullable(distServer).map(settings::getServer).map(DefaultSettingsDecryptionRequest::new)
.map(settingsDecrypter::decrypt).map(SettingsDecryptionResult::getServer);
providerRepository.setUser(server.map(Server::getUsername).orElse(username));
providerRepository.setPassword(server.map(Server::getPassword).orElse(password));
}
/**
* Making the constructor private because the class only contains static methods.
*/
private SharedFunctions() {
// Utility Class
}
}