001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
013     */
014    
015    package com.liferay.portal.kernel.util;
016    
017    import java.util.LinkedHashMap;
018    import java.util.Map;
019    
020    /**
021     * @author Brian Wing Shun Chan
022     */
023    public class LRUMap<K, V> extends LinkedHashMap<K, V> {
024    
025            public LRUMap(int capacity) {
026                    super(capacity * 3 / 2, 0.75f, true);
027    
028                    _capacity = capacity;
029            }
030    
031            protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
032                    if (size() > _capacity) {
033                            return true;
034                    }
035                    else {
036                            return false;
037                    }
038            }
039    
040            private int _capacity;
041    
042    }