1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   *
12   *
13   */
14  
15  package com.liferay.portal.cache.key;
16  
17  import com.liferay.portal.kernel.cache.key.CacheKeyGenerator;
18  import com.liferay.portal.kernel.util.StringBundler;
19  import com.liferay.portal.kernel.util.StringUtil;
20  
21  /**
22   * <a href="HashCodeCacheKeyGenerator.java.html"><b><i>View Source</i></b></a>
23   *
24   * @author Michael C. Han
25   * @author Shuyang Zhou
26   */
27  public class HashCodeCacheKeyGenerator extends BaseCacheKeyGenerator {
28  
29      public CacheKeyGenerator clone() {
30          return new HashCodeCacheKeyGenerator();
31      }
32  
33      public String getCacheKey(String key) {
34          return StringUtil.toHexString(key.hashCode());
35      }
36  
37      public String getCacheKey(String[] keys) {
38          int hashCode = 0;
39  
40          for (String key : keys) {
41              hashCode = 31 * hashCode + key.hashCode();
42          }
43  
44          return StringUtil.toHexString(hashCode);
45      }
46  
47      public String getCacheKey(StringBundler sb) {
48          int hashCode = 0;
49  
50          for (int i = 0; i < sb.index(); i++) {
51              hashCode = 31 * hashCode + sb.stringAt(i).hashCode();
52          }
53  
54          return StringUtil.toHexString(hashCode);
55      }
56  
57  }