package org.apache.maven.shared.dependency.graph.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.Collections;
  import java.util.List;
  
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.shared.dependency.graph.DependencyGraphBuilder;
  import org.apache.maven.shared.dependency.graph.DependencyGraphBuilderException;
  import org.apache.maven.shared.dependency.graph.DependencyNode;
  import org.apache.maven.shared.dependency.tree.DependencyTreeBuilder;
  import org.apache.maven.shared.dependency.tree.DependencyTreeBuilderException;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  
  /**
   * Wrapper around Maven 2 dependency tree builder.
   *
   * @see DependencyTreeBuilder
   * @author Hervé Boutemy
   * @since 2.0
   */
  @Component( role = DependencyGraphBuilder.class, hint = "maven2" )
  public class Maven2DependencyGraphBuilder
      implements DependencyGraphBuilder
  {
      @Requirement
      private DependencyTreeBuilder treeBuilder;
  
      public DependencyNode buildDependencyGraph( MavenProject project, ArtifactFilter filter )
          throws DependencyGraphBuilderException
      {
          try
          {
              return buildDependencyNode( null, treeBuilder.buildDependencyTree( project ), filter );
          }
          catch ( DependencyTreeBuilderException e )
          {
              throw new DependencyGraphBuilderException( e.getMessage(), e );
          }
      }
  
      private DependencyNode buildDependencyNode( DependencyNode parent,
                                                  org.apache.maven.shared.dependency.tree.DependencyNode node,
                                                  ArtifactFilter filter )
      {
          String versionSelectedFromRange = null;
          if ( node.getVersionSelectedFromRange() != null )
          {
              versionSelectedFromRange = node.getVersionSelectedFromRange().toString();
          }
  
          DefaultDependencyNode current =
              new DefaultDependencyNode( parent, node.getArtifact(), node.getPremanagedVersion(),
                                         node.getPremanagedScope(), versionSelectedFromRange );
  
          List<DependencyNode> nodes = new ArrayList<DependencyNode>( node.getChildren().size() );
          for ( org.apache.maven.shared.dependency.tree.DependencyNode child : node.getChildren() )
          {
              if ( child.getState() != org.apache.maven.shared.dependency.tree.DependencyNode.INCLUDED )
              {
                  // only included nodes are supported in the graph API
                  continue;
              }
  
              if ( ( filter == null ) || filter.include( child.getArtifact() ) )
              {
                  nodes.add( buildDependencyNode( current, child, filter ) );
              }
          }
  
          current.setChildren( Collections.unmodifiableList( nodes ) );
  
          return current;
      }
  }