001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.cache.key;
016    
017    import com.liferay.portal.kernel.cache.key.CacheKeyGenerator;
018    import com.liferay.portal.kernel.util.StringBundler;
019    
020    /**
021     * @author Michael C. Han
022     * @author Shuyang Zhou
023     */
024    public class HashCodeCacheKeyGenerator extends BaseCacheKeyGenerator {
025    
026            public CacheKeyGenerator clone() {
027                    return new HashCodeCacheKeyGenerator();
028            }
029    
030            public String getCacheKey(String key) {
031                    return String.valueOf(key.hashCode());
032            }
033    
034            public String getCacheKey(String[] keys) {
035                    int hashCode = 0;
036    
037                    for (String key : keys) {
038                            hashCode = 31 * hashCode + key.hashCode();
039                    }
040    
041                    return String.valueOf(hashCode);
042            }
043    
044            public String getCacheKey(StringBundler sb) {
045                    int hashCode = 0;
046    
047                    for (int i = 0; i < sb.index(); i++) {
048                            hashCode = 31 * hashCode + sb.stringAt(i).hashCode();
049                    }
050    
051                    return String.valueOf(hashCode);
052            }
053    
054    }