1 package org.alfresco.maven.plugin.amp.util;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.AbstractMap;
23 import java.util.Collections;
24 import java.util.Map;
25 import java.util.Set;
26
27 /***
28 * @version $Id: CompositeMap.java 565036 2007-08-12 10:26:14Z snicoll $
29 * @todo merge with resources/assembly plugin
30 */
31 public class CompositeMap
32 extends AbstractMap
33 {
34 private Map recessive;
35
36 private Map dominant;
37
38 public CompositeMap( Map dominant, Map recessive )
39 {
40 this.dominant = Collections.unmodifiableMap( dominant );
41
42 this.recessive = Collections.unmodifiableMap( recessive );
43 }
44
45 public synchronized Object get( Object key )
46 {
47 Object value = dominant.get( key );
48
49 if ( value == null )
50 {
51 value = recessive.get( key );
52 }
53
54 return value;
55 }
56
57 public Set entrySet()
58 {
59 throw new UnsupportedOperationException( "Cannot enumerate properties in a composite map" );
60 }
61 }