package org.apache.maven.shared.transfer.dependencies.collect.internal;
   
   /*
    * 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.util.ArrayList;
  import java.util.List;
  
  import org.apache.maven.RepositoryUtils;
  import org.apache.maven.artifact.handler.ArtifactHandler;
  import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
  import org.apache.maven.model.Model;
  import org.apache.maven.shared.transfer.dependencies.DependableCoordinate;
  import org.apache.maven.shared.transfer.dependencies.collect.CollectorResult;
  import org.apache.maven.shared.transfer.dependencies.collect.DependencyCollector;
  import org.apache.maven.shared.transfer.dependencies.collect.DependencyCollectorException;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.artifact.ArtifactTypeRegistry;
  import org.eclipse.aether.artifact.DefaultArtifact;
  import org.eclipse.aether.collection.CollectRequest;
  import org.eclipse.aether.collection.DependencyCollectionException;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.repository.RemoteRepository;
  
  /**
   * Maven 3.1+ implementation of the {@link DependencyCollector}
   * 
   * @author Robert Scholte
   *
   */
  class Maven31DependencyCollector
      implements MavenDependencyCollector
  {
      private final RepositorySystem repositorySystem;
  
      private final ArtifactHandlerManager artifactHandlerManager;
      
      private final RepositorySystemSession session;
      
      private final List<RemoteRepository> aetherRepositories;
      
      Maven31DependencyCollector( RepositorySystem repositorySystem, ArtifactHandlerManager artifactHandlerManager,
                                  RepositorySystemSession session, List<RemoteRepository> aetherRepositories )
      {
          super();
          this.repositorySystem = repositorySystem;
          this.artifactHandlerManager = artifactHandlerManager;
          this.session = session;
          this.aetherRepositories = aetherRepositories;
      }
  
      @Override
      public CollectorResult collectDependencies( org.apache.maven.model.Dependency root )
          throws DependencyCollectorException
      {
          ArtifactTypeRegistry typeRegistry =
                          (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
                                                                 ArtifactHandlerManager.class, artifactHandlerManager );
  
          CollectRequest request = new CollectRequest();
          request.setRoot( toDependency( root, typeRegistry ) );
  
          return collectDependencies( request );
      }
  
      @Override
      public CollectorResult collectDependencies( DependableCoordinate root )
          throws DependencyCollectorException
      {
          ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getType() );
          
          String extension = artifactHandler != null ? artifactHandler.getExtension() : null;
          
          Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), root.getClassifier(),
                                                         extension, root.getVersion() );
          
          CollectRequest request = new CollectRequest();
          request.setRoot( new Dependency( aetherArtifact, null ) );
  
          return collectDependencies( request );
      }
     
     @Override
     public CollectorResult collectDependencies( Model root )
         throws DependencyCollectorException
     {
         // Are there examples where packaging and type are NOT in sync
         ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getPackaging() );
         
         String extension = artifactHandler != null ? artifactHandler.getExtension() : null;
         
         Artifact aetherArtifact =
             new DefaultArtifact( root.getGroupId(), root.getArtifactId(), extension, root.getVersion() );
         
         CollectRequest request = new CollectRequest();
         request.setRoot( new Dependency( aetherArtifact, null ) );
         
         ArtifactTypeRegistry typeRegistry =
                         (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
                                                                ArtifactHandlerManager.class, artifactHandlerManager );
 
         List<Dependency> aetherDependencies = new ArrayList<Dependency>( root.getDependencies().size() );
         for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencies() )
         {
             aetherDependencies.add( toDependency( mavenDependency, typeRegistry ) );
         }
         request.setDependencies( aetherDependencies );
 
         if ( root.getDependencyManagement() != null )
         {
             List<Dependency> aetherManagerDependencies =
                 new ArrayList<Dependency>( root.getDependencyManagement().getDependencies().size() );
             
             for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencyManagement().getDependencies() )
             {
                 aetherManagerDependencies.add( toDependency( mavenDependency, typeRegistry ) );
             }
             
             request.setManagedDependencies( aetherManagerDependencies );
         }
 
         return collectDependencies( request );
     }
 
     private CollectorResult collectDependencies( CollectRequest request )
         throws DependencyCollectorException
     {
         request.setRepositories( aetherRepositories );
 
         try
         {
             return new Maven31CollectorResult( repositorySystem.collectDependencies( session, request ) );
         }
         catch ( DependencyCollectionException e )
         {
             throw new DependencyCollectorException( e.getMessage(), e );
         }
     }
 
     private static Dependency toDependency( org.apache.maven.model.Dependency root, ArtifactTypeRegistry typeRegistry )
                     throws DependencyCollectorException
     {
         Class<?>[] argClasses = new Class<?>[] { org.apache.maven.model.Dependency.class, ArtifactTypeRegistry.class };
 
         Object[] args = new Object[] { root, typeRegistry };
 
         return (Dependency) Invoker.invoke( RepositoryUtils.class, "toDependency", argClasses, args );
     }
 }