package org.apache.maven;
   
   /*
    * 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.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import org.apache.maven.artifact.ArtifactUtils;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.project.MavenProject;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.repository.WorkspaceReader;
  import org.eclipse.aether.repository.WorkspaceRepository;
  import org.eclipse.aether.util.artifact.ArtifactIdUtils;
  
  /**
   * An implementation of a workspace reader that knows how to search the Maven reactor for artifacts.
   * 
   * @author Jason van Zyl
   */
  @Named
  @SessionScoped
  class ReactorReader
      implements WorkspaceReader
  {
      private static final Collection<String> COMPILE_PHASE_TYPES = Arrays.asList( "jar", "ejb-client" );
  
      private Map<String, MavenProject> projectsByGAV;
  
      private Map<String, List<MavenProject>> projectsByGA;
  
      private WorkspaceRepository repository;
  
      @Inject
      public ReactorReader( MavenSession session )
      {
          projectsByGAV = session.getProjectMap();
  
          projectsByGA = new HashMap<String, List<MavenProject>>( projectsByGAV.size() * 2 );
          for ( MavenProject project : projectsByGAV.values() )
          {
              String key = ArtifactUtils.versionlessKey( project.getGroupId(), project.getArtifactId() );
  
              List<MavenProject> projects = projectsByGA.get( key );
  
              if ( projects == null )
              {
                  projects = new ArrayList<MavenProject>( 1 );
                  projectsByGA.put( key, projects );
              }
  
              projects.add( project );
          }
  
          repository = new WorkspaceRepository( "reactor", new HashSet<String>( projectsByGAV.keySet() ) );
      }
  
      //
      // Public API
      //
  
      public WorkspaceRepository getRepository()
      {
          return repository;
      }
  
      public File findArtifact( Artifact artifact )
      {
          String projectKey = ArtifactUtils.key( artifact.getGroupId(), artifact.getArtifactId(), artifact.getVersion() );
  
          MavenProject project = projectsByGAV.get( projectKey );
 
         if ( project != null )
         {
             File file = find( project, artifact );
             if ( file == null && project != project.getExecutionProject() )
             {
                 file = find( project.getExecutionProject(), artifact );
             }
             return file;
         }
 
         return null;
     }
 
     public List<String> findVersions( Artifact artifact )
     {
         String key = ArtifactUtils.versionlessKey( artifact.getGroupId(), artifact.getArtifactId() );
 
         List<MavenProject> projects = projectsByGA.get( key );
         if ( projects == null || projects.isEmpty() )
         {
             return Collections.emptyList();
         }
 
         List<String> versions = new ArrayList<String>();
 
         for ( MavenProject project : projects )
         {
             if ( find( project, artifact ) != null )
             {
                 versions.add( project.getVersion() );
             }
         }
 
         return Collections.unmodifiableList( versions );
     }
 
     //
     // Implementation
     //
 
     private File find( MavenProject project, Artifact artifact )
     {
         if ( "pom".equals( artifact.getExtension() ) )
         {
             return project.getFile();
         }
 
         Artifact projectArtifact = findMatchingArtifact( project, artifact );
 
         if ( hasArtifactFileFromPackagePhase( projectArtifact ) )
         {
             return projectArtifact.getFile();
         }
         else if ( !hasBeenPackaged( project ) )
         {
             // fallback to loose class files only if artifacts haven't been packaged yet
             // and only for plain old jars. Not war files, not ear files, not anything else.
 
             if ( isTestArtifact( artifact ) )
             {
                 if ( project.hasLifecyclePhase( "test-compile" ) )
                 {
                     return new File( project.getBuild().getTestOutputDirectory() );
                 }
             }
             else
             {
                 String type = artifact.getProperty( "type", "" );
                 if ( project.hasLifecyclePhase( "compile" ) && COMPILE_PHASE_TYPES.contains( type ) )
                 {
                     return new File( project.getBuild().getOutputDirectory() );
                 }
             }
         }
 
         // The fall-through indicates that the artifact cannot be found;
         // for instance if package produced nothing or classifier problems.
         return null;
     }
 
     private boolean hasArtifactFileFromPackagePhase( Artifact projectArtifact )
     {
         return projectArtifact != null && projectArtifact.getFile() != null && projectArtifact.getFile().exists();
     }
 
     private boolean hasBeenPackaged( MavenProject project )
     {
         return project.hasLifecyclePhase( "package" ) || project.hasLifecyclePhase( "install" )
             || project.hasLifecyclePhase( "deploy" );
     }
 
     /**
      * Tries to resolve the specified artifact from the artifacts of the given project.
      * 
      * @param project The project to try to resolve the artifact from, must not be <code>null</code>.
      * @param requestedArtifact The artifact to resolve, must not be <code>null</code>.
      * @return The matching artifact from the project or <code>null</code> if not found. Note that this
      */
     private Artifact findMatchingArtifact( MavenProject project, Artifact requestedArtifact )
     {
         String requestedRepositoryConflictId = ArtifactIdUtils.toVersionlessId( requestedArtifact );
 
         Artifact mainArtifact = RepositoryUtils.toArtifact( project.getArtifact() );
         if ( requestedRepositoryConflictId.equals( ArtifactIdUtils.toVersionlessId( mainArtifact ) ) )
         {
             return mainArtifact;
         }
 
         for ( Artifact attachedArtifact : RepositoryUtils.toArtifacts( project.getAttachedArtifacts() ) )
         {
             if ( attachedArtifactComparison( requestedArtifact, attachedArtifact ) )
             {
                 return attachedArtifact;
             }
         }
 
         return null;
     }
 
     private boolean attachedArtifactComparison( Artifact requested, Artifact attached )
     {
         //
         // We are taking as much as we can from the DefaultArtifact.equals(). The requested artifact has no file so
         // we want to remove that from the comparision.
         //
         return requested.getArtifactId().equals( attached.getArtifactId() )
             && requested.getGroupId().equals( attached.getGroupId() )
             && requested.getVersion().equals( attached.getVersion() )
             && requested.getExtension().equals( attached.getExtension() )
             && requested.getClassifier().equals( attached.getClassifier() );
     }
 
     /**
      * Determines whether the specified artifact refers to test classes.
      * 
      * @param artifact The artifact to check, must not be {@code null}.
      * @return {@code true} if the artifact refers to test classes, {@code false} otherwise.
      */
     private static boolean isTestArtifact( Artifact artifact )
     {
         return ( "test-jar".equals( artifact.getProperty( "type", "" ) ) )
             || ( "jar".equals( artifact.getExtension() ) && "tests".equals( artifact.getClassifier() ) );
     }
 }