package org.apache.maven.plugin;
   
   /*
    * 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.ByteArrayOutputStream;
  import java.io.PrintStream;
  import java.util.List;
  
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.plugin.descriptor.MojoDescriptor;
  import org.apache.maven.plugin.descriptor.PluginDescriptor;
  import org.apache.maven.project.MavenProject;
  import org.codehaus.plexus.PlexusContainer;
  import org.codehaus.plexus.classworlds.realm.ClassRealm;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  import org.sonatype.aether.RepositorySystemSession;
  import org.sonatype.aether.repository.RemoteRepository;
  
  // TODO: the antrun plugin has its own configurator, the only plugin that does. might need to think about how that works
  // TODO: remove the coreArtifactFilterManager
  
  @Component(role = BuildPluginManager.class)
  public class DefaultBuildPluginManager
      implements BuildPluginManager
  {
  
      @Requirement
      private PlexusContainer container;
  
      @Requirement
      private MavenPluginManager mavenPluginManager;
  
      @Requirement
      private LegacySupport legacySupport;
  
      /**
       * 
       * @param plugin
       * @param repositoryRequest
       * @return PluginDescriptor The component descriptor for the Maven plugin.
       * @throws PluginNotFoundException The plugin could not be found in any repositories.
       * @throws PluginResolutionException The plugin could be found but could not be resolved.
       * @throws InvalidPluginDescriptorException 
       */
      public PluginDescriptor loadPlugin( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
          throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException, InvalidPluginDescriptorException
      {
          return mavenPluginManager.getPluginDescriptor( plugin, repositories, session );
      }
  
      // ----------------------------------------------------------------------
      // Mojo execution
      // ----------------------------------------------------------------------
  
      public void executeMojo( MavenSession session, MojoExecution mojoExecution )
          throws MojoFailureException, MojoExecutionException, PluginConfigurationException, PluginManagerException
      {
          MavenProject project = session.getCurrentProject();
  
          MojoDescriptor mojoDescriptor = mojoExecution.getMojoDescriptor();
  
          Mojo mojo = null;
  
          ClassRealm pluginRealm;
          try
          {
              pluginRealm = getPluginRealm( session, mojoDescriptor.getPluginDescriptor() );
          }
          catch ( PluginResolutionException e )
          {
              throw new PluginExecutionException( mojoExecution, project, e );
          }
  
          ClassRealm oldLookupRealm = container.getLookupRealm();
          ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
  
          MavenSession oldSession = legacySupport.getSession();
  
          try
          {
              mojo = mavenPluginManager.getConfiguredMojo( Mojo.class, session, mojoExecution );
  
              Thread.currentThread().setContextClassLoader( pluginRealm );
  
             legacySupport.setSession( session );
 
             // NOTE: DuplicateArtifactAttachmentException is currently unchecked, so be careful removing this try/catch!
             // This is necessary to avoid creating compatibility problems for existing plugins that use
             // MavenProjectHelper.attachArtifact(..).
             try
             {
                 mojo.execute();
             }
             catch ( ClassCastException e )
             {
                 // to be processed in the outer catch block
                 throw e;
             }
             catch ( RuntimeException e )
             {
                 throw new PluginExecutionException( mojoExecution, project, e );
             }
         }
         catch ( PluginContainerException e )
         {
             throw new PluginExecutionException( mojoExecution, project, e );
         }
         catch ( NoClassDefFoundError e )
         {
             ByteArrayOutputStream os = new ByteArrayOutputStream( 1024 );
             PrintStream ps = new PrintStream( os );
             ps.println( "A required class was missing while executing " + mojoDescriptor.getId() + ": "
                 + e.getMessage() );
             pluginRealm.display( ps );
 
             Exception wrapper = new PluginContainerException( mojoDescriptor, pluginRealm, os.toString(), e );
 
             throw new PluginExecutionException( mojoExecution, project, wrapper );
         }
         catch ( LinkageError e )
         {
             ByteArrayOutputStream os = new ByteArrayOutputStream( 1024 );
             PrintStream ps = new PrintStream( os );
             ps.println( "An API incompatibility was encountered while executing " + mojoDescriptor.getId() + ": "
                 + e.getClass().getName() + ": " + e.getMessage() );
             pluginRealm.display( ps );
 
             Exception wrapper = new PluginContainerException( mojoDescriptor, pluginRealm, os.toString(), e );
 
             throw new PluginExecutionException( mojoExecution, project, wrapper );
         }
         catch ( ClassCastException e )
         {
             ByteArrayOutputStream os = new ByteArrayOutputStream( 1024 );
             PrintStream ps = new PrintStream( os );
             ps.println( "A type incompatibility occured while executing " + mojoDescriptor.getId() + ": "
                 + e.getMessage() );
             pluginRealm.display( ps );
 
             throw new PluginExecutionException( mojoExecution, project, os.toString(), e );
         }
         finally
         {
             mavenPluginManager.releaseMojo( mojo, mojoExecution );
 
             if ( oldLookupRealm != null )
             {
                 container.setLookupRealm( null );
             }
 
             Thread.currentThread().setContextClassLoader( oldClassLoader );
 
             legacySupport.setSession( oldSession );
         }
     }
 
     /**
      * TODO pluginDescriptor classRealm and artifacts are set as a side effect of this
      *      call, which is not nice.
      * @throws PluginResolutionException 
      */
     public ClassRealm getPluginRealm( MavenSession session, PluginDescriptor pluginDescriptor ) 
         throws PluginResolutionException, PluginManagerException
     {
         ClassRealm pluginRealm = pluginDescriptor.getClassRealm();
         if ( pluginRealm != null )
         {
             return pluginRealm;
         }
 
         mavenPluginManager.setupPluginRealm( pluginDescriptor, session, session.getCurrentProject().getClassRealm(),
                                              null, null );
 
         return pluginDescriptor.getClassRealm();
     }
 
     public MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, List<RemoteRepository> repositories,
                                              RepositorySystemSession session )
         throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
         MojoNotFoundException, InvalidPluginDescriptorException
     {
         return mavenPluginManager.getMojoDescriptor( plugin, goal, repositories, session );
     }
 
 }