001    /**
002     * Copyright (c) 2000-2012 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            @Override
027            public CacheKeyGenerator clone() {
028                    return new HashCodeCacheKeyGenerator();
029            }
030    
031            public Long getCacheKey(String key) {
032                    long hashCode = 0;
033    
034                    for (int i = 0; i < key.length(); i++) {
035                            hashCode = 31 * hashCode + key.charAt(i);
036                    }
037    
038                    return hashCode;
039            }
040    
041            public Long getCacheKey(String[] keys) {
042                    long hashCode = 0;
043    
044                    for (String key : keys) {
045                            if (key == null) {
046                                    continue;
047                            }
048    
049                            for (int i = 0; i < key.length(); i++) {
050                                    hashCode = 31 * hashCode + key.charAt(i);
051                            }
052                    }
053    
054                    return hashCode;
055            }
056    
057            public Long getCacheKey(StringBundler sb) {
058                    long hashCode = 0;
059    
060                    for (int i = 0; i < sb.index(); i++) {
061                            String key = sb.stringAt(i);
062    
063                            for (int j = 0; j < key.length(); j++) {
064                                    hashCode = 31 * hashCode + key.charAt(j);
065                            }
066                    }
067    
068                    return hashCode;
069            }
070    
071    }