001    /*--------------------------------------------------------------------------+
002    $Id: ArrayBackedStringMap.java 29399 2010-07-27 15:03:17Z juergens $
003    |                                                                          |
004    | Copyright 2005-2010 Technische Universitaet Muenchen                     |
005    |                                                                          |
006    | Licensed under the Apache License, Version 2.0 (the "License");          |
007    | you may not use this file except in compliance with the License.         |
008    | You may obtain a copy of the License at                                  |
009    |                                                                          |
010    |    http://www.apache.org/licenses/LICENSE-2.0                            |
011    |                                                                          |
012    | Unless required by applicable law or agreed to in writing, software      |
013    | distributed under the License is distributed on an "AS IS" BASIS,        |
014    | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
015    | See the License for the specific language governing permissions and      |
016    | limitations under the License.                                           |
017    +--------------------------------------------------------------------------*/
018    package edu.tum.cs.commons.collections;
019    
020    /**
021     * A specialization of the array backed map for string keys. This uses string
022     * interning and reference comparison.
023     * 
024     * @author hummelb
025     * @author $Author: juergens $
026     * @version $Rev: 29399 $
027     * @levd.rating GREEN Hash: A6370F398F915DFAA7510CD39DE491C0
028     */
029    public class ArrayBackedStringMap<V> extends ArrayBackedMap<String, V> {
030    
031            /** Constructor. */
032            public ArrayBackedStringMap() {
033                    super();
034            }
035    
036            /** Constructor. */
037            public ArrayBackedStringMap(int initialCapacity) {
038                    super(initialCapacity);
039            }
040    
041            /** {@inheritDoc} */
042            @Override
043            protected String internKey(Object key) throws ClassCastException {
044                    if (key == null) {
045                            return null;
046                    }
047                    return ((String) key).intern();
048            }
049    
050            /** {@inheritDoc} */
051            @Override
052            protected boolean areEqual(String key1, String key2) {
053                    return key1 == key2;
054            }
055    }