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 java.io.File;
  import java.nio.file.Path;
  import java.util.Collection;
  import java.util.Locale;
  import java.util.Map;
  import java.util.ResourceBundle;
  import java.util.stream.Collectors;
  
  import org.apache.maven.doxia.sink.Sink;
  import org.apache.maven.doxia.siterenderer.RenderingContext;
  import org.apache.maven.doxia.siterenderer.sink.SiteRendererSink;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugins.annotations.Execute;
  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.reporting.MavenReport;
  import org.apache.maven.reporting.MavenReportException;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Generates documentation for the <code>Java code</code> in an <b>NON aggregator</b> project using the standard
   * <a href="http://docs.oracle.com/javase/7/docs/technotes/guides/javadoc/">Javadoc Tool</a>.
   *
   * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
   * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a>
   * @since 2.0
   * @see <a href="http://docs.oracle.com/javase/7/docs/technotes/guides/javadoc/">Javadoc Tool</a>
   * @see <a href="http://docs.oracle.com/javase/7/docs/technotes/tools/windows/javadoc.html#options">Javadoc Options</a>
   */
  @Mojo( name = "javadoc", requiresDependencyResolution = ResolutionScope.COMPILE, threadSafe = true )
  @Execute( phase = LifecyclePhase.GENERATE_SOURCES )
  public class JavadocReport
      extends AbstractJavadocMojo
      implements MavenReport
  {
      // ----------------------------------------------------------------------
      // Report Mojo Parameters
      // ----------------------------------------------------------------------
  
      /**
       * Specifies the destination directory where javadoc saves the generated HTML files.
       */
      @Parameter( property = "reportOutputDirectory", defaultValue = "${project.reporting.outputDirectory}/apidocs",
                  required = true )
      private File reportOutputDirectory;
  
      /**
       * The name of the destination directory.
       * <br/>
       *
       * @since 2.1
       */
      @Parameter( property = "destDir", defaultValue = "apidocs" )
      private String destDir;
  
      /**
       * The name of the Javadoc report to be displayed in the Maven Generated Reports page
       * (i.e. <code>project-reports.html</code>).
       *
       * @since 2.1
       */
      @Parameter( property = "name" )
      private String name;
  
      /**
       * The description of the Javadoc report to be displayed in the Maven Generated Reports page
       * (i.e. <code>project-reports.html</code>).
       *
       * @since 2.1
       */
      @Parameter( property = "description" )
      private String description;
  
      // ----------------------------------------------------------------------
      // Report public methods
     // ----------------------------------------------------------------------
 
     /** {@inheritDoc} */
     @Override
     public String getName( Locale locale )
     {
         if ( StringUtils.isEmpty( name ) )
         {
             return getBundle( locale ).getString( "report.javadoc.name" );
         }
 
         return name;
     }
 
     /** {@inheritDoc} */
     @Override
     public String getDescription( Locale locale )
     {
         if ( StringUtils.isEmpty( description ) )
         {
             return getBundle( locale ).getString( "report.javadoc.description" );
         }
 
         return description;
     }
 
     /** {@inheritDoc} */
     @Override
     public void generate( Sink sink, Locale locale )
         throws MavenReportException
     {
         outputDirectory = getReportOutputDirectory();
 
         try
         {
             executeReport( locale );
         }
         catch ( MavenReportException | RuntimeException e )
         {
             if ( failOnError )
             {
                 throw e;
             }
             getLog().error( "Error while creating javadoc report: " + e.getMessage(), e );
         }
     }
 
     /** {@inheritDoc} */
     @Override
     public String getOutputName()
     {
         return destDir + "/index";
     }
 
     /** {@inheritDoc} */
     @Override
     public boolean isExternalReport()
     {
         return true;
     }
 
     /**
      * {@inheritDoc}
      *
      * <br>
      * The logic is the following:
      * <table><caption>Can-generate-report Matrix</caption>
      *   <tbody>
      *     <tr>
      *       <th> isAggregator </th>
      *       <th> hasSourceFiles </th>
      *       <th> isRootProject </th>
      *       <th> Generate Report </th>
      *     </tr>
      *     <tr>
      *       <td>True</td>
      *       <td>True</td>
      *       <td>True</td>
      *       <td>True</td>
      *     </tr>
      *     <tr>
      *       <td>True</td>
      *       <td>True</td>
      *       <td>False</td>
      *       <td>False</td>
      *     </tr>
      *     <tr>
      *       <td>True</td>
      *       <td>False</td>
      *       <td>True</td>
      *       <td>False</td>
      *     </tr>
      *     <tr>
      *       <td>True</td>
      *       <td>False</td>
      *       <td>False</td>
      *       <td>False</td>
      *     </tr>
      *     <tr>
      *       <td>False</td>
      *       <td>True</td>
      *       <td>True</td>
      *       <td>True</td>
      *     </tr>
      *     <tr>
      *       <td>False</td>
      *       <td>True</td>
      *       <td>False</td>
      *       <td>True</td>
      *     </tr>
      *     <tr>
      *        <td>False</td>
      *        <td>False</td>
      *        <td>True</td>
      *        <td>False</td>
      *      </tr>
      *      <tr>
      *        <td>False</td>
      *        <td>False</td>
      *        <td>False</td>
      *        <td>False</td>
      *      </tr>
      *    </tbody>
      *  </table>
      */
     @Override
     public boolean canGenerateReport()
     {
         boolean canGenerate = false;
 
         if ( this.isAggregator() || !"pom".equals( this.project.getPackaging() ) )
         {
             Collection<Path> sourcePaths;
             Map<Path, Collection<String>> files;
             try
             {
                 sourcePaths = getSourcePaths().stream()
                                 .flatMap( e -> e.getSourcePaths().stream() )
                                 .collect( Collectors.toList() );
                 files = getFiles( sourcePaths );
             }
             catch ( MavenReportException e )
             {
                 getLog().error( e.getMessage(), e );
                 return false;
             }
 
             canGenerate = canGenerateReport( files );
         }
         if ( getLog().isDebugEnabled() )
         {
             getLog().debug( " canGenerateReport = " + canGenerate + " for project " + this.project );
         }
         return canGenerate;
     }
 
     /** {@inheritDoc} */
     @Override
     public String getCategoryName()
     {
         return CATEGORY_PROJECT_REPORTS;
     }
 
     /** {@inheritDoc} */
     @Override
     public File getReportOutputDirectory()
     {
         if ( reportOutputDirectory == null )
         {
             return outputDirectory;
         }
 
         return reportOutputDirectory;
     }
 
     /**
      * Method to set the directory where the generated reports will be put
      *
      * @param reportOutputDirectory the directory file to be set
      */
     @Override
     public void setReportOutputDirectory( File reportOutputDirectory )
     {
         updateReportOutputDirectory( reportOutputDirectory, destDir );
     }
 
     /**
      * @param theDestDir The destination directory.
      */
     public void setDestDir( String theDestDir )
     {
         this.destDir = theDestDir;
         updateReportOutputDirectory( reportOutputDirectory, theDestDir );
     }
 
     private void updateReportOutputDirectory( File reportOutputDirectory, String destDir )
     {
         if ( reportOutputDirectory != null && destDir != null
              && !reportOutputDirectory.getAbsolutePath().endsWith( destDir ) )
         {
             this.reportOutputDirectory = new File( reportOutputDirectory, destDir );
         }
         else
         {
             this.reportOutputDirectory = reportOutputDirectory;
         }
     }
 
     /** {@inheritDoc} */
     @Override
     public void doExecute()
         throws MojoExecutionException, MojoFailureException
     {
         if ( skip )
         {
             getLog().info( "Skipping javadoc generation" );
             return;
         }
 
         try
         {
             RenderingContext context = new RenderingContext( outputDirectory, getOutputName() + ".html" );
             SiteRendererSink sink = new SiteRendererSink( context );
             Locale locale = Locale.getDefault();
             generate( sink, locale );
         }
         catch ( MavenReportException | RuntimeException e )
         {
             failOnError( "An error has occurred in " + getName( Locale.ENGLISH ) + " report generation", e );
         }
     }
 
     /**
      * Gets the resource bundle for the specified locale.
      *
      * @param locale The locale of the currently generated report.
      * @return The resource bundle for the requested locale.
      */
     private ResourceBundle getBundle( Locale locale )
     {
         return ResourceBundle.getBundle( "javadoc-report", locale, getClass().getClassLoader() );
     }
 }