package org.apache.maven.plugin.jar;
   
   /*
    * 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.archiver.MavenArchiveConfiguration;
  import org.apache.maven.archiver.MavenArchiver;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.annotations.Component;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.MavenProjectHelper;
  import org.codehaus.plexus.archiver.Archiver;
  import org.codehaus.plexus.archiver.jar.JarArchiver;
  
  import java.io.File;
  
  /**
   * Base class for creating a jar from project classes.
   *
   * @author <a href="evenisse@apache.org">Emmanuel Venisse</a>
   * @version $Id: AbstractJarMojo.java 1636726 2014-11-04 20:11:52Z khmarbaise $
   */
  public abstract class AbstractJarMojo
      extends AbstractMojo
  {
  
      private static final String[] DEFAULT_EXCLUDES = new String[]{ "**/package.html" };
  
      private static final String[] DEFAULT_INCLUDES = new String[]{ "**/**" };
  
      /**
       * List of files to include. Specified as fileset patterns which are relative to the input directory whose contents
       * is being packaged into the JAR.
       */
      @Parameter
      private String[] includes;
  
      /**
       * List of files to exclude. Specified as fileset patterns which are relative to the input directory whose contents
       * is being packaged into the JAR.
       */
      @Parameter
      private String[] excludes;
  
      /**
       * Directory containing the generated JAR.
       */
      @Parameter( defaultValue = "${project.build.directory}", required = true )
      private File outputDirectory;
  
      /**
       * Name of the generated JAR.
       */
      @Parameter( alias = "jarName", property = "jar.finalName", defaultValue = "${project.build.finalName}" )
      private String finalName;
  
      /**
       * The Jar archiver.
       */
      @Component( role = Archiver.class, hint = "jar" )
      private JarArchiver jarArchiver;
  
      /**
       * The Maven project.
       */
      @Parameter( defaultValue = "${project}", readonly = true, required = true )
      private MavenProject project;
  
      /**
       *
       */
      @Parameter( defaultValue = "${session}", readonly = true, required = true )
      private MavenSession session;
  
      /**
       * 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>.
      *
      * @since 2.2
      */
     @Parameter( defaultValue = "${project.build.outputDirectory}/META-INF/MANIFEST.MF", required = true,
                 readonly = true )
     private File defaultManifestFile;
 
     /**
      * Set this to <code>true</code> to enable the use of the <code>defaultManifestFile</code>.
      *
      * @since 2.2
      */
     @Parameter( property = "jar.useDefaultManifestFile", defaultValue = "false" )
     private boolean useDefaultManifestFile;
 
     /**
      *
      */
     @Component
     private MavenProjectHelper projectHelper;
 
     /**
      * Require the jar plugin to build a new JAR even if none of the contents appear to have changed.
      * By default, this plugin looks to see if the output jar exists and inputs have not changed.
      * If these conditions are true, the plugin skips creation of the jar. This does not work when
      * other plugins, like the maven-shade-plugin, are configured to post-process the jar.
      * This plugin can not detect the post-processing, and so leaves the post-processed jar in place.
      * This can lead to failures when those plugins do not expect to find their own output
      * as an input. Set this parameter to <tt>true</tt> to avoid these problems by forcing
      * this plugin to recreate the jar every time.
      */
     @Parameter( property = "jar.forceCreation", defaultValue = "false" )
     private boolean forceCreation;
 
     /**
      * Skip creating empty archives
      */
     @Parameter( property = "jar.skipIfEmpty", defaultValue = "false" )
     private boolean skipIfEmpty;
 
     /**
      * Return the specific output directory to serve as the root for the archive.
      */
     protected abstract File getClassesDirectory();
 
     protected final MavenProject getProject()
     {
         return project;
     }
 
     /**
      * Overload this to produce a jar with another classifier, for example a test-jar.
      */
     protected abstract String getClassifier();
 
     /**
      * Overload this to produce a test-jar, for example.
      */
     protected abstract String getType();
 
     protected static File getJarFile( File basedir, String finalName, String classifier )
     {
         if ( classifier == null )
         {
             classifier = "";
         }
         else if ( classifier.trim().length() > 0 && !classifier.startsWith( "-" ) )
         {
             classifier = "-" + classifier;
         }
 
         return new File( basedir, finalName + classifier + ".jar" );
     }
 
     /**
      * Default Manifest location. Can point to a non existing file.
      * Cannot return null.
      */
     protected File getDefaultManifestFile()
     {
         return defaultManifestFile;
     }
 
 
     /**
      * Generates the JAR.
      *
      * @todo Add license files in META-INF directory.
      */
     public File createArchive()
         throws MojoExecutionException
     {
         File jarFile = getJarFile( outputDirectory, finalName, getClassifier() );
 
         MavenArchiver archiver = new MavenArchiver();
 
         archiver.setArchiver( jarArchiver );
 
         archiver.setOutputFile( jarFile );
 
         archive.setForced( forceCreation );
 
         try
         {
             File contentDirectory = getClassesDirectory();
             if ( !contentDirectory.exists() )
             {
                 getLog().warn( "JAR will be empty - no content was marked for inclusion!" );
             }
             else
             {
                 archiver.getArchiver().addDirectory( contentDirectory, getIncludes(), getExcludes() );
             }
 
             File existingManifest = getDefaultManifestFile();
 
             if ( useDefaultManifestFile && existingManifest.exists() && archive.getManifestFile() == null )
             {
                 getLog().info( "Adding existing MANIFEST to archive. Found under: " + existingManifest.getPath() );
                 archive.setManifestFile( existingManifest );
             }
 
             archiver.createArchive( session, project, archive );
 
             return jarFile;
         }
         catch ( Exception e )
         {
             // TODO: improve error handling
             throw new MojoExecutionException( "Error assembling JAR", e );
         }
     }
 
     /**
      * Generates the JAR.
      *
      * @todo Add license files in META-INF directory.
      */
     public void execute()
         throws MojoExecutionException
     {
         if ( skipIfEmpty && ( !getClassesDirectory().exists() || getClassesDirectory().list().length < 1 ) )
         {
             getLog().info( "Skipping packaging of the " + getType() );
         }
         else
         {
             File jarFile = createArchive();
 
             String classifier = getClassifier();
             if ( classifier != null )
             {
                 projectHelper.attachArtifact( getProject(), getType(), classifier, jarFile );
             }
             else
             {
                 getProject().getArtifact().setFile( jarFile );
             }
         }
     }
 
     private String[] getIncludes()
     {
         if ( includes != null && includes.length > 0 )
         {
             return includes;
         }
         return DEFAULT_INCLUDES;
     }
 
     private String[] getExcludes()
     {
         if ( excludes != null && excludes.length > 0 )
         {
             return excludes;
         }
         return DEFAULT_EXCLUDES;
     }
 }