UniqueHashMap


1   // Copyright 2007 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.hivemind.util;
16  
17  import java.util.HashMap  ;
18  
19  import org.apache.hivemind.ApplicationRuntimeException;
20  
21  /**
22   * Specialized map that guarantees uniqueness of key values.
23   * 
24   * @author Achim Huegen
25   */
26  public class UniqueHashMap extends HashMap  
27  {
28  
29      private static final long serialVersionUID = -3961343404455706964L;
30  
31      public Object   put(Object   key, Object   value)
32      {
33          if (containsKey(key)) {
34              throw new ApplicationRuntimeException(UtilMessages.duplicateKeyInMap(key));
35          }
36          return super.put(key, value);
37      }
38  
39  }
40

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