package org.apache.maven.plugin.war;

 /*

  * Copyright 2001-2006 The Apache Software Foundation.

  *

  * Licensed 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.AbstractMap;

 import java.util.Collections;

 import java.util.Map;

 import java.util.Set;

 /**

  * @version $Id: CompositeMap.java 417362 2006-06-27 07:30:32Z brett $

  * @todo merge with resources/assembly plugin

  */

 public class CompositeMap

     extends AbstractMap

 {

     private Map recessive;

     private Map dominant;

     public CompositeMap( Map dominant, Map recessive )

     {

         this.dominant = Collections.unmodifiableMap( dominant );

         this.recessive = Collections.unmodifiableMap( recessive );

     }

     public synchronized Object get( Object key )

     {

         Object value = dominant.get( key );

         if ( value == null )

         {

             value = recessive.get( key );

         }

         return value;

     }

     public Set entrySet()

     {

         throw new UnsupportedOperationException( "Cannot enumerate properties in a composite map" );

     }

 }