src/main/java/org/apache/maven/plugins/javadoc/ResourcesBundleMojo.java

package org.apache.maven.plugins.javadoc;

/*
 * 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.
 */

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Component;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.plugins.annotations.ResolutionScope;
import org.apache.maven.project.MavenProjectHelper;
import org.codehaus.plexus.archiver.Archiver;
import org.codehaus.plexus.archiver.ArchiverException;
import org.codehaus.plexus.archiver.manager.ArchiverManager;
import org.codehaus.plexus.archiver.manager.NoSuchArchiverException;
import org.codehaus.plexus.archiver.util.DefaultFileSet;

import java.io.File;
import java.io.IOException;

/**
 * Bundle {@link AbstractJavadocMojo#javadocDirectory}, along with javadoc configuration options such
 * as taglet, doclet, and link information into a deployable artifact. This artifact can then be consumed
 * by the javadoc plugin mojos when used by the <code>includeDependencySources</code> option, to generate
 * javadocs that are somewhat consistent with those generated in the original project itself.
 *
 * @since 2.7
 */
@Mojo( name = "resource-bundle", defaultPhase = LifecyclePhase.PACKAGE,
       requiresDependencyResolution = ResolutionScope.COMPILE, threadSafe = true )
public class ResourcesBundleMojo
extends AbstractJavadocMojo
{

    /**
     * Bundle options path.
     */
    public static final String BUNDLE_OPTIONS_PATH = "META-INF/maven/javadoc-options.xml";

    /**
     * Resources directory path.
     */
    public static final String RESOURCES_DIR_PATH = "resources";

    /**
     * Base name of artifacts produced by this project. This will be combined with
     * {@link ResourcesBundleMojo#getAttachmentClassifier()} to produce the name for this bundle
     * jar.
     */
    @Parameter( defaultValue = "${project.build.finalName}", readonly = true )
    private String finalName;

    /**
     * Helper component to provide an easy mechanism for attaching an artifact to the project for
     * installation/deployment.
     */
    @Component
    private MavenProjectHelper projectHelper;

    /**
     * Archiver manager, used to manage jar builder.
     */
    @Component
    private ArchiverManager archiverManager;

    /**
     * Assemble a new {@link org.apache.maven.plugins.javadoc.options.JavadocOptions JavadocOptions} instance that
     * contains the configuration options in this
     * mojo, which are a subset of those provided in derivatives of the {@link AbstractJavadocMojo}
     * class (most of the javadoc mojos, in other words). Then, bundle the contents of the
     * <code>javadocDirectory</code> along with the assembled JavadocOptions instance (serialized to
     * META-INF/maven/javadoc-options.xml) into a project attachment for installation/deployment.
     *
     * {@inheritDoc}
     * @see org.apache.maven.plugin.Mojo#execute()
     */
    @Override
    public void doExecute()
        throws MojoExecutionException
    {
        try
        {
            buildJavadocOptions();
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "Failed to generate javadoc-options file: " + e.getMessage(), e );
        }

        Archiver archiver;
        try
        {
            archiver = archiverManager.getArchiver( "jar" );
        }
        catch ( NoSuchArchiverException e )
        {
            throw new MojoExecutionException( "Failed to retrieve jar archiver component from manager.", e );
        }

        File optionsFile = getJavadocOptionsFile();
        File bundleFile =
            new File( getProject().getBuild().getDirectory(), finalName + "-" + getAttachmentClassifier() + ".jar" );
        try
        {
            archiver.addFile( optionsFile, BUNDLE_OPTIONS_PATH );

            File javadocDir = getJavadocDirectory();
            if ( javadocDir.isDirectory() )
            {
                DefaultFileSet fileSet = DefaultFileSet.fileSet( javadocDir ).prefixed( RESOURCES_DIR_PATH + "/" );
                archiver.addFileSet( fileSet );
            }

            archiver.setDestFile( bundleFile );
            archiver.createArchive();
        }
        catch ( ArchiverException | IOException e )
        {
            throw new MojoExecutionException( "Failed to assemble javadoc-resources bundle archive. Reason: "
                + e.getMessage(), e );
        }

        projectHelper.attachArtifact( getProject(), bundleFile, getAttachmentClassifier() );
    }
}