ScalaDocJarMojo.java

package scala_maven;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Locale;

import org.apache.maven.archiver.MavenArchiveConfiguration;
import org.apache.maven.archiver.MavenArchiver;
import org.apache.maven.artifact.DependencyResolutionRequiredException;
import org.apache.maven.model.Resource;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.project.MavenProjectHelper;
import org.apache.maven.reporting.MavenReportException;
import org.codehaus.plexus.archiver.ArchiverException;
import org.codehaus.plexus.archiver.jar.JarArchiver;
import org.codehaus.plexus.archiver.jar.ManifestException;

/**
 * Creates a jar of the non-aggregated scaladoc and attaches it
 * to the project for distribution.
 * @goal doc-jar
 * @phase package
 *
 */
public class ScalaDocJarMojo extends ScalaDocMojo {

  private static final String[] DEFAULT_INCLUDES = new String[] { "**/**" };
  private static final String[] DEFAULT_EXCLUDES = new String[] {};
  /**
   * The Jar archiver.
   *
   * @component role="org.codehaus.plexus.archiver.Archiver" roleHint="jar"
   */
  private JarArchiver jarArchiver;

  /**
  * Used for attaching the artifact in the project.
  *
  * @component
  */
  private MavenProjectHelper projectHelper;
  /**
   * Specifies the filename that will be used for the generated jar file. Please note that <code>-javadoc</code>
   * or <code>-test-javadoc</code> will be appended to the file name.
   *
   * @parameter property="project.build.finalName"
   */
  private String finalName;
  /**
   * Specifies whether to attach the generated artifact to the project helper.
   * <br/>
   *
   * @parameter property="attach" default-value="true"
   */
  private boolean attach;
  /**
   * Specifies the classifier of the generated artifact.
   *
   * @parameter property="classifier" default-value="javadoc"
   */
  private String classifier;
  /**
   * Specifies whether to skip generating scaladoc.
   * <br/>
   *
   * @parameter property="skip" default-value="false"
   */
  private boolean skip;
  /**
   * Specifies the directory where the generated jar file will be put.
   *
   * @parameter property="project.build.directory"
   */
  private String jarOutputDirectory;
  /**
   * The archive configuration to use.
   * See <a href="http://maven.apache.org/shared/maven-archiver/index.html">Maven Archiver Reference</a>.
   *
   * @parameter
   */
  private MavenArchiveConfiguration archive = new MavenArchiveConfiguration();

  /**
   * Path to the default MANIFEST file to use. It will be used if
   * <code>useDefaultManifestFile</code> is set to <code>true</code>.
   *
   * @parameter default-value="${project.build.outputDirectory}/META-INF/MANIFEST.MF"
   * @required
   * @readonly
   */
  private File defaultManifestFile;

  /**
   * Set this to <code>true</code> to enable the use of the <code>defaultManifestFile</code>.
   * <br/>
   *
   * @parameter default-value="false"
   */
  private boolean useDefaultManifestFile;

  /**
   * Specifies if the build will fail if there are errors during javadoc execution or not.
   *
   * @parameter property="maven.javadoc.failOnError" default-value="true"
   * @since 2.5
   */
  protected boolean failOnError;

  @Override
  public void doExecute() throws Exception {
    if(skip) {
      getLog().info( "Skipping javadoc generation" );
      return;
    }
    try {
      generate(null, Locale.getDefault());
      if(reportOutputDirectory.exists()) {
        File outputFile = generateArchive( reportOutputDirectory, finalName + "-" + getClassifier() + ".jar" );
        if(!attach ) {
          getLog().info( "NOT adding javadoc to attached artifacts list." );
        } else {
          // TODO: these introduced dependencies on the project are going to become problematic - can we export it
          //  through metadata instead?
          projectHelper.attachArtifact( project, "javadoc", getClassifier(), outputFile );
        }
      }
    } catch (ArchiverException e) {
      failOnError( "ArchiverException: Error while creating archive", e );
    } catch (IOException e) {
      failOnError( "IOException: Error while creating archive", e );
    } catch ( MavenReportException e ) {
      failOnError( "MavenReportException: Error while creating archive", e );
    } catch ( RuntimeException e ) {
      failOnError( "RuntimeException: Error while creating archive", e );
    }
  }



  /**
   * Method that creates the jar file
   *
   * @param javadocFiles the directory where the generated jar file will be put
   * @param jarFileName the filename of the generated jar file
   * @return a File object that contains the generated jar file
   * @throws ArchiverException
   * @throws IOException
   */
  private File generateArchive( File javadocFiles, String jarFileName ) throws ArchiverException, IOException {
    final File javadocJar = new File( jarOutputDirectory, jarFileName );
    if(javadocJar.exists()) {
      javadocJar.delete();
    }
    MavenArchiver archiver = new MavenArchiver();
    archiver.setArchiver( jarArchiver );
    archiver.setOutputFile( javadocJar );
    File contentDirectory = javadocFiles;
    if(!contentDirectory.exists()) {
      getLog().warn( "JAR will be empty - no content was marked for inclusion!" );
    } else {
      archiver.getArchiver().addDirectory( contentDirectory, DEFAULT_INCLUDES, DEFAULT_EXCLUDES );
    }
    List<Resource> resources = project.getBuild().getResources();
    for ( Resource r : resources ) {
      if ( r.getDirectory().endsWith( "maven-shared-archive-resources" ) ) {
        archiver.getArchiver().addDirectory( new File( r.getDirectory() ) );
      }
    }
    if ( useDefaultManifestFile && defaultManifestFile.exists() && archive.getManifestFile() == null ) {
      getLog().info("Adding existing MANIFEST to archive. Found under: " + defaultManifestFile.getPath());
      archive.setManifestFile(defaultManifestFile);
    }
    try {
      // we don't want Maven stuff
      archive.setAddMavenDescriptor( false );
      archiver.createArchive( project, archive );
    } catch ( ManifestException e ) {
      throw new ArchiverException( "ManifestException: " + e.getMessage(), e );
    } catch ( DependencyResolutionRequiredException e ) {
      throw new ArchiverException( "DependencyResolutionRequiredException: " + e.getMessage(), e );
    }
    return javadocJar;
  }

  protected String getClassifier() {
    return classifier;
  }

  protected void failOnError(String prefix, Exception e)
      throws MojoExecutionException {
    if (failOnError) {
      if (e instanceof RuntimeException) {
        throw (RuntimeException) e;
      }
      throw new MojoExecutionException(prefix + ": " + e.getMessage(), e);
    }
    getLog().error(prefix + ": " + e.getMessage(), e);
  }
}