package org.apache.maven.plugin.dependency;
   
   /*
    * 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.artifact.Artifact;
  import org.apache.maven.artifact.factory.ArtifactFactory;
  import org.apache.maven.artifact.metadata.ArtifactMetadataSource;
  import org.apache.maven.artifact.repository.ArtifactRepository;
  import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
  import org.apache.maven.artifact.resolver.ArtifactResolutionException;
  import org.apache.maven.artifact.resolver.ArtifactResolutionResult;
  import org.apache.maven.artifact.resolver.ArtifactResolver;
  import org.apache.maven.artifact.resolver.filter.AndArtifactFilter;
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugins.annotations.Component;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.artifact.InvalidDependencyVersionException;
  import org.apache.maven.shared.artifact.filter.PatternExcludesArtifactFilter;
  import org.apache.maven.shared.artifact.filter.PatternIncludesArtifactFilter;
  import org.codehaus.plexus.util.FileUtils;
  import org.codehaus.plexus.util.StringUtils;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Set;
  
  /**
   * Remove the project dependencies from the local repository, and optionally re-resolve them.
   * 
   * @author jdcasey
   * @version $Id: PurgeLocalRepositoryMojo.html 937155 2015-01-21 21:53:50Z khmarbaise $
   * @since 2.0
   */
  @Mojo( name = "purge-local-repository", threadSafe = true )
  public class PurgeLocalRepositoryMojo
      extends AbstractMojo
  {
  
      public static final String FILE_FUZZINESS = "file";
  
      public static final String VERSION_FUZZINESS = "version";
  
      public static final String ARTIFACT_ID_FUZZINESS = "artifactId";
  
      public static final String GROUP_ID_FUZZINESS = "groupId";
  
      /**
       * The current Maven project.
       */
      @Parameter( defaultValue = "${project}", readonly = true, required = true )
      private MavenProject project;
  
      /**
       * The list of dependencies in the form of groupId:artifactId which should BE deleted/purged from the local
       * repository. Note that using this parameter will deactivate the normal process for purging the current project
       * dependency tree. If this parameter is used, only the included artifacts will be purged. The manualIncludes
       * parameter should not be used in combination with the includes/excludes parameters.
       * 
       * @since 2.6
       */
      @Parameter
      private List<String> manualIncludes;
  
      /**
       * Comma-separated list of groupId:artifactId entries, which should be used to manually include artifacts for
       * deletion. This is a command-line alternative to the <code>manualIncludes</code> parameter, since List parameters
       * are not currently compatible with CLI specification.
       * 
       * @since 2.6
       */
      @Parameter( property = "manualInclude" )
      private String manualInclude;
  
     /**
      * The list of dependencies in the form of groupId:artifactId which should BE deleted/refreshed.
      * 
      * @since 2.6
      */
     @Parameter
     private List<String> includes;
 
     /**
      * Comma-separated list of groupId:artifactId entries, which should be used to include artifacts for
      * deletion/refresh. This is a command-line alternative to the <code>includes</code> parameter, since List
      * parameters are not currently compatible with CLI specification.
      * 
      * @since 2.6
      */
     @Parameter( property = "include" )
     private String include;
 
     /**
      * The list of dependencies in the form of groupId:artifactId which should NOT be deleted/refreshed.
      */
     @Parameter
     private List<String> excludes;
 
     /**
      * Comma-separated list of groupId:artifactId entries, which should be used to exclude artifacts from
      * deletion/refresh. This is a command-line alternative to the <code>excludes</code> parameter, since List
      * parameters are not currently compatible with CLI specification.
      */
     @Parameter( property = "exclude" )
     private String exclude;
 
     /**
      * Whether to re-resolve the artifacts once they have been deleted from the local repository. If you are running
      * this mojo from the command-line, you may want to disable this. By default, artifacts will be re-resolved.
      */
     @Parameter( property = "reResolve", defaultValue = "true" )
     private boolean reResolve;
 
     /**
      * The local repository, from which to delete artifacts.
      */
     @Parameter( defaultValue = "${localRepository}", readonly = true, required = true )
     private ArtifactRepository localRepository;
 
     /**
      * List of Remote Repositories used by the resolver
      */
     @Parameter( defaultValue = "${project.remoteArtifactRepositories}", readonly = true, required = true )
     protected List<ArtifactRepository> remoteRepositories;
 
     /**
      * The artifact resolver used to re-resolve dependencies, if that option is enabled.
      */
     @Component
     private ArtifactResolver resolver;
 
     /**
      * The artifact metadata source used to resolve dependencies
      */
     @Component
     private ArtifactMetadataSource metadataSource;
 
     /**
      * Determines how liberally the plugin will delete an artifact from the local repository. Values are: <br/>
      * <ul>
      * <li><b>file</b> - Eliminate only the artifact's file.</li>
      * <li><b>version</b> <i>(default)</i> - Eliminate all files associated with the version of the artifact.</li>
      * <li><b>artifactId</b> - Eliminate all files associated with the artifact's artifactId.</li>
      * <li><b>groupId</b> - Eliminate all files associated with the artifact's groupId.</li>
      * </ul>
      */
     @Parameter( property = "resolutionFuzziness", defaultValue = "version" )
     private String resolutionFuzziness;
 
     /**
      * Whether this mojo should act on all transitive dependencies. Default value is true.
      */
     @Parameter( property = "actTransitively", defaultValue = "true" )
     private boolean actTransitively;
 
     /**
      * Used to construct artifacts for deletion/resolution...
      */
     @Component
     private ArtifactFactory factory;
 
     /**
      * Whether this plugin should output verbose messages. Default is false.
      */
     @Parameter( property = "verbose", defaultValue = "false" )
     private boolean verbose;
 
     /**
      * Whether to purge only snapshot artifacts.
      * 
      * @since 2.4
      */
     @Parameter( property = "snapshotsOnly", defaultValue = "false" )
     private boolean snapshotsOnly;
 
     /**
      * Skip plugin execution completely.
      *
      * @since 2.7
      */
     @Parameter( property = "skip", defaultValue = "false" )
     private boolean skip;
 
     /**
      * Includes only direct project dependencies.
      */
     private class DirectDependencyFilter
         implements ArtifactFilter
     {
 
         private Artifact projectArtifact;
 
         private Set<Artifact> directDependencyArtifacts;
 
         /**
          * Default constructor
          * 
          * @param directDependencyArtifacts Set of Artifact objects which represent the direct dependencies of the
          *            project
          */
         public DirectDependencyFilter( Artifact projectArtifact, Set<Artifact> directDependencyArtifacts )
         {
             this.projectArtifact = projectArtifact;
             this.directDependencyArtifacts = directDependencyArtifacts;
         }
 
         public boolean include( Artifact artifact )
         {
             if ( artifactsGAMatch( artifact, projectArtifact ) )
             {
                 return true;
             }
             for ( Artifact depArtifact : directDependencyArtifacts )
             {
                 if ( this.artifactsGAMatch( artifact, depArtifact ) )
                 {
                     return true;
                 }
             }
             return false;
         }
 
         /*
          * Compare the groupId:artifactId of two artifacts.
          */
         private boolean artifactsGAMatch( Artifact artifact1, Artifact artifact2 )
         {
             if ( artifact1 == artifact2 )
             {
                 return true;
             }
 
             if ( !artifact1.getGroupId().equals( artifact2.getGroupId() ) )
             {
                 getLog().debug( "Different groupId: " + artifact1 + "  " + artifact2 );
                 return false;
             }
             if ( !artifact1.getArtifactId().equals( artifact2.getArtifactId() ) )
             {
                 getLog().debug( "Different artifactId: " + artifact1 + "  " + artifact2 );
                 return false;
             }
             return true;
         }
     }
 
     /**
      * Includes only artifacts that do not use system scope
      */
     private class SystemScopeExcludeFilter
         implements ArtifactFilter
     {
         public boolean include( Artifact artifact )
         {
             return !Artifact.SCOPE_SYSTEM.equals( artifact.getScope() );
         }
     }
 
     /**
      * Includes only snapshot artifacts
      */
     private class SnapshotsFilter
         implements ArtifactFilter
     {
         public boolean include( Artifact artifact )
         {
             return artifact.isSnapshot();
         }
     }
 
     public void execute()
         throws MojoExecutionException, MojoFailureException
     {
         if ( isSkip() )
         {
             getLog().info( "Skipping plugin execution" );
             return;
         }
 
         if ( !StringUtils.isEmpty( manualInclude ) )
         {
             manualIncludes = this.parseIncludes( manualInclude );
         }
         // If it's a manual purge, the only step is to delete from the local repo
         if ( manualIncludes != null && manualIncludes.size() > 0 )
         {
             manualPurge( manualIncludes );
             return;
         }
 
         Set<Artifact> dependencyArtifacts;
 
         try
         {
             dependencyArtifacts = project.createArtifacts( factory, null, null );
         }
         catch ( InvalidDependencyVersionException e )
         {
             throw new MojoFailureException( "Unable to purge dependencies due to invalid dependency version ", e );
         }
 
         ArtifactFilter artifactFilter = createPurgeArtifactsFilter( dependencyArtifacts );
 
         Set<Artifact> resolvedArtifactsToPurge =
             getFilteredResolvedArtifacts( project, dependencyArtifacts, artifactFilter );
 
         if ( resolvedArtifactsToPurge.isEmpty() )
         {
             getLog().info( "No artifacts included for purge for project: " + project.getId() );
             return;
         }
 
         verbose( "Purging dependencies for project: " + project.getId() );
         purgeArtifacts( resolvedArtifactsToPurge );
 
         if ( reResolve )
         {
             try
             {
                 reResolveArtifacts( project, resolvedArtifactsToPurge, artifactFilter );
             }
             catch ( ArtifactResolutionException e )
             {
                 String failureMessage = "Failed to refresh project dependencies for: " + project.getId();
                 MojoFailureException failure = new MojoFailureException( failureMessage );
                 failure.initCause( e );
 
                 throw failure;
             }
             catch ( ArtifactNotFoundException e )
             {
                 String failureMessage = "Failed to refresh project dependencies for: " + project.getId();
                 MojoFailureException failure = new MojoFailureException( failureMessage );
                 failure.initCause( e );
 
                 throw failure;
             }
         }
     }
 
     /**
      * Purge/Delete artifacts from the local repository according to the given patterns.
      * 
      * @param inclusionPatterns
      * @throws MojoExecutionException
      */
     private void manualPurge( List<String> includes )
         throws MojoExecutionException
     {
         for ( String gavPattern : includes )
         {
             if ( StringUtils.isEmpty( gavPattern ) )
             {
                 getLog().debug( "Skipping empty gav pattern: " + gavPattern );
                 continue;
             }
 
             String relativePath = gavToPath( gavPattern );
             if ( StringUtils.isEmpty( relativePath ) )
             {
                 continue;
             }
 
             File purgeDir = new File( localRepository.getBasedir(), relativePath );
             if ( purgeDir.exists() )
             {
                 getLog().debug( "Deleting directory: " + purgeDir );
                 try
                 {
                     FileUtils.deleteDirectory( purgeDir );
                 }
                 catch ( IOException e )
                 {
                     throw new MojoExecutionException( "Unable to purge directory: " + purgeDir );
                 }
             }
         }
     }
 
     /**
      * Convert a groupId:artifactId:version to a file system path
      * 
      * @param gav, the groupId:artifactId:version string
      * @return
      */
     private String gavToPath( String gav )
     {
         if ( StringUtils.isEmpty( gav ) )
         {
             return null;
         }
 
         String[] pathComponents = gav.split( ":" );
 
         StringBuilder path = new StringBuilder( pathComponents[0].replace( '.', '/' ) );
 
         for ( int i = 1; i < pathComponents.length; ++i )
         {
             path.append( "/" ).append( pathComponents[i] );
         }
 
         return path.toString();
     }
 
     /**
      * Create the includes exclude filter to use when resolving and purging dependencies Also excludes any "system"
      * scope dependencies
      * 
      * @param dependencyArtifacts The dependency artifacts to use as a reference if we're excluding transitive
      *            dependencies
      * @return
      */
     private ArtifactFilter createPurgeArtifactsFilter( Set<Artifact> dependencyArtifacts )
     {
         AndArtifactFilter andFilter = new AndArtifactFilter();
 
         // System dependencies should never be purged
         andFilter.add( new SystemScopeExcludeFilter() );
 
         if ( this.snapshotsOnly )
         {
             andFilter.add( new SnapshotsFilter() );
         }
 
         // The CLI includes/excludes overrides configuration in the pom
         if ( !StringUtils.isEmpty( this.include ) )
         {
             this.includes = parseIncludes( this.include );
         }
         if ( this.includes != null )
         {
             andFilter.add( new PatternIncludesArtifactFilter( includes ) );
         }
 
         if ( !StringUtils.isEmpty( this.exclude ) )
         {
             this.excludes = parseIncludes( this.exclude );
         }
         if ( this.excludes != null )
         {
             andFilter.add( new PatternExcludesArtifactFilter( excludes ) );
         }
 
         if ( !actTransitively )
         {
             andFilter.add( new DirectDependencyFilter( project.getArtifact(), dependencyArtifacts ) );
         }
 
         return andFilter;
     }
 
     /**
      * Convert comma separated list of includes to List object
      * 
      * @param include
      * @return the includes list
      */
     private List<String> parseIncludes( String include )
     {
         List<String> includes = new ArrayList<String>();
 
         if ( include != null )
         {
             String[] elements = include.split( "," );
             includes.addAll( Arrays.asList( elements ) );
         }
 
         return includes;
     }
 
     private Set<Artifact> getFilteredResolvedArtifacts( MavenProject project, Set<Artifact> artifacts,
                                                         ArtifactFilter filter )
     {
         try
         {
             ArtifactResolutionResult result =
                 resolver.resolveTransitively( artifacts, project.getArtifact(), localRepository, remoteRepositories,
                                               metadataSource, filter );
 
             @SuppressWarnings( "unchecked" )
             Set<Artifact> resolvedArtifacts = result.getArtifacts();
 
             return resolvedArtifacts;
         }
         catch ( ArtifactResolutionException e )
         {
             getLog().info( "Unable to resolve all dependencies for : " + e.getGroupId() + ":" + e.getArtifactId() + ":"
                                + e.getVersion()
                                + ". Falling back to non-transitive mode for initial artifact resolution." );
         }
         catch ( ArtifactNotFoundException e )
         {
             getLog().info( "Unable to resolve all dependencies for : " + e.getGroupId() + ":" + e.getArtifactId() + ":"
                                + e.getVersion()
                                + ". Falling back to non-transitive mode for initial artifact resolution." );
         }
 
         Set<Artifact> resolvedArtifacts = new LinkedHashSet<Artifact>();
         // Resolve the only poms here instead of the actual artifacts, because the files will be deleted during the
         // purge anyway
         for ( Artifact artifact : artifacts )
         {
             if ( filter.include( artifact ) )
             {
                 try
                 {
                     resolvedArtifacts.add( artifact );
                     resolver.resolve( artifact, remoteRepositories, localRepository );
                 }
                 catch ( ArtifactResolutionException e )
                 {
                     getLog().debug( "Unable to resolve artifact: " + artifact );
                 }
                 catch ( ArtifactNotFoundException e )
                 {
                     getLog().debug( "Unable to resolve artifact: " + artifact );
                 }
             }
         }
         return resolvedArtifacts;
     }
 
     private void purgeArtifacts( Set<Artifact> artifacts )
         throws MojoFailureException
     {
         for ( Artifact artifact : artifacts )
         {
             verbose( "Purging artifact: " + artifact.getId() );
 
             File deleteTarget = findDeleteTarget( artifact );
 
             verbose( "Deleting: " + deleteTarget );
 
             if ( deleteTarget.isDirectory() )
             {
                 try
                 {
                     FileUtils.deleteDirectory( deleteTarget );
                 }
                 catch ( IOException e )
                 {
                     getLog().warn( "Unable to purge local repository location: " + deleteTarget, e );
                 }
             }
             else
             {
                 if ( !deleteTarget.delete() )
                 {
                     getLog().warn( "Unable to purge local repository location: " + deleteTarget );
                 }
             }
             artifact.setResolved( false );
         }
     }
 
     private void reResolveArtifacts( MavenProject project, Set<Artifact> artifacts, ArtifactFilter filter )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
 
         // Always need to re-resolve the poms in case they were purged along with the artifact
         // because Maven 2 will not automatically re-resolve them when resolving the artifact
         for ( Artifact artifact : artifacts )
         {
             try
             {
                 Artifact pomArtifact =
                     factory.createArtifact( artifact.getGroupId(), artifact.getArtifactId(), artifact.getVersion(),
                                             null, "pom" );
                 resolver.resolveAlways( pomArtifact, remoteRepositories, localRepository );
             }
             catch ( ArtifactResolutionException e )
             {
                 verbose( e.getMessage() );
             }
             catch ( ArtifactNotFoundException e )
             {
                 verbose( e.getMessage() );
             }
         }
 
         List<Artifact> missingArtifacts = new ArrayList<Artifact>();
 
         for ( Artifact artifact : artifacts )
         {
             verbose( "Resolving artifact: " + artifact.getId() );
 
             try
             {
                 resolver.resolveAlways( artifact, project.getRemoteArtifactRepositories(), localRepository );
             }
             catch ( ArtifactResolutionException e )
             {
                 verbose( e.getMessage() );
                 missingArtifacts.add( artifact );
             }
             catch ( ArtifactNotFoundException e )
             {
                 verbose( e.getMessage() );
                 missingArtifacts.add( artifact );
             }
         }
 
         if ( missingArtifacts.size() > 0 )
         {
             StringBuffer message = new StringBuffer( "required artifacts missing:\n" );
             for ( Artifact missingArtifact : missingArtifacts )
             {
                 message.append( "  " ).append( missingArtifact.getId() ).append( '\n' );
             }
             message.append( "\nfor the artifact:" );
 
             throw new ArtifactResolutionException( message.toString(), project.getArtifact(),
                                                    project.getRemoteArtifactRepositories() );
         }
     }
 
     private File findDeleteTarget( Artifact artifact )
     {
         // Use localRepository.pathOf() in case artifact.getFile() is not set
         File deleteTarget = new File( localRepository.getBasedir(), localRepository.pathOf( artifact ) );
 
         if ( GROUP_ID_FUZZINESS.equals( resolutionFuzziness ) )
         {
             // get the groupId dir.
             deleteTarget = deleteTarget.getParentFile().getParentFile().getParentFile();
         }
         else if ( ARTIFACT_ID_FUZZINESS.equals( resolutionFuzziness ) )
         {
             // get the artifactId dir.
             deleteTarget = deleteTarget.getParentFile().getParentFile();
         }
         else if ( VERSION_FUZZINESS.equals( resolutionFuzziness ) )
         {
             // get the version dir.
             deleteTarget = deleteTarget.getParentFile();
         }
         // else it's file fuzziness.
         return deleteTarget;
     }
 
     private void verbose( String message )
     {
         if ( verbose || getLog().isDebugEnabled() )
         {
             getLog().info( message );
         }
     }
 
     public boolean isSkip()
     {
         return skip;
     }
 
     public void setSkip( boolean skip )
     {
         this.skip = skip;
     }
 }