package org.apache.maven.archiva.dependency.graph.functors;
   
   /*
    * 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.commons.collections.Transformer;
  import org.apache.maven.archiva.dependency.graph.DependencyGraphEdge;
  import org.apache.maven.archiva.dependency.graph.DependencyGraphKeys;
  import org.apache.maven.archiva.dependency.graph.DependencyGraphNode;
  import org.apache.maven.archiva.model.ArchivaProjectModel;
  import org.apache.maven.archiva.model.ArtifactReference;
  import org.apache.maven.archiva.model.Keys;
  
  /**
   * ToKeyTransformer 
   *
   * @version $Id: ToKeyTransformer.java 718864 2008-11-19 06:33:35Z brett $
   */
  public class ToKeyTransformer
      implements Transformer
  {
  
      public Object transform( Object input )
      {
          if ( input instanceof ArchivaProjectModel )
          {
              return Keys.toKey( (ArchivaProjectModel) input );
          }
  
          if ( input instanceof DependencyGraphNode )
          {
              return DependencyGraphKeys.toKey( ((DependencyGraphNode) input).getArtifact() );
          }
  
          if ( input instanceof DependencyGraphEdge )
          {
              DependencyGraphEdge edge = (DependencyGraphEdge) input;
              // Potentially Confusing, but this is called "To"KeyTransformer after all.
              return DependencyGraphKeys.toKey( edge.getNodeTo() );
          }
  
          if ( input instanceof ArtifactReference )
          {
              return DependencyGraphKeys.toKey( ((ArtifactReference) input) );
          }
  
          return input;
      }
  
  }