001/*-------------------------------------------------------------------------+
002|                                                                          |
003| Copyright 2005-2011 The ConQAT Project                                   |
004|                                                                          |
005| Licensed under the Apache License, Version 2.0 (the "License");          |
006| you may not use this file except in compliance with the License.         |
007| You may obtain a copy of the License at                                  |
008|                                                                          |
009|    http://www.apache.org/licenses/LICENSE-2.0                            |
010|                                                                          |
011| Unless required by applicable law or agreed to in writing, software      |
012| distributed under the License is distributed on an "AS IS" BASIS,        |
013| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
014| See the License for the specific language governing permissions and      |
015| limitations under the License.                                           |
016+-------------------------------------------------------------------------*/
017package org.conqat.lib.commons.collections;
018
019/**
020 * A specialization of the array backed map for string keys. This uses string
021 * interning and reference comparison.
022 * 
023 * @author hummelb
024 */
025public class ArrayBackedStringMap<V> extends ArrayBackedMap<String, V> {
026
027        /** Constructor. */
028        public ArrayBackedStringMap() {
029                super();
030        }
031
032        /** Constructor. */
033        public ArrayBackedStringMap(int initialCapacity) {
034                super(initialCapacity);
035        }
036
037        /** {@inheritDoc} */
038        @Override
039        protected String internKey(Object key) throws ClassCastException {
040                if (key == null) {
041                        return null;
042                }
043                return ((String) key).intern();
044        }
045
046        /** {@inheritDoc} */
047        @Override
048        protected boolean areEqual(String key1, String key2) {
049                return key1 == key2;
050        }
051}