1   /**
2    * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portlet.amazonrankings.util;
24  
25  import com.liferay.portal.kernel.util.StringPool;
26  import com.liferay.portal.kernel.webcache.WebCacheItem;
27  import com.liferay.portal.kernel.webcache.WebCachePoolUtil;
28  import com.liferay.portal.util.PropsKeys;
29  import com.liferay.portal.util.PropsUtil;
30  import com.liferay.portlet.amazonrankings.model.AmazonRankings;
31  
32  import java.util.List;
33  import java.util.Vector;
34  
35  /**
36   * <a href="AmazonRankingsUtil.java.html"><b><i>View Source</i></b></a>
37   *
38   * @author Brian Wing Shun Chan
39   *
40   */
41  public class AmazonRankingsUtil {
42  
43      public static String getAmazonKey() {
44          return _instance._getAmazonKey();
45      }
46  
47      public static AmazonRankings getAmazonRankings(String isbn) {
48          WebCacheItem wci = new AmazonRankingsWebCacheItem(isbn);
49  
50          return (AmazonRankings)WebCachePoolUtil.get(
51              AmazonRankingsUtil.class.getName() + StringPool.PERIOD + isbn, wci);
52      }
53  
54      private AmazonRankingsUtil() {
55          _amazonLicenseKeys = new Vector<String>();
56  
57          for (int i = 0; i < 1000; i++) {
58              String key = PropsUtil.get(PropsKeys.AMAZON_LICENSE + i);
59  
60              if (key == null) {
61                  break;
62              }
63              else {
64                  _amazonLicenseKeys.add(key);
65              }
66          }
67      }
68  
69      private String _getAmazonKey() {
70          if (_amazonLicenseKeys.size() > 0) {
71              _amazonLicenseCount++;
72  
73              if (_amazonLicenseCount >= _amazonLicenseKeys.size()) {
74                  _amazonLicenseCount = 0;
75              }
76  
77              return _amazonLicenseKeys.get(_amazonLicenseCount);
78          }
79          else {
80              return null;
81          }
82      }
83  
84      private static AmazonRankingsUtil _instance = new AmazonRankingsUtil();
85  
86      private List<String> _amazonLicenseKeys;
87      private int _amazonLicenseCount;
88  
89  }