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.PropsUtil;
29  import com.liferay.portlet.amazonrankings.model.AmazonRankings;
30  
31  import java.util.List;
32  import java.util.Vector;
33  
34  /**
35   * <a href="AmazonRankingsUtil.java.html"><b><i>View Source</i></b></a>
36   *
37   * @author Brian Wing Shun Chan
38   *
39   */
40  public class AmazonRankingsUtil {
41  
42      public static String getAmazonKey() {
43          return _instance._getAmazonKey();
44      }
45  
46      public static AmazonRankings getAmazonRankings(String isbn) {
47          WebCacheItem wci = new AmazonRankingsWebCacheItem(isbn);
48  
49          return (AmazonRankings)WebCachePoolUtil.get(
50              AmazonRankingsUtil.class.getName() + StringPool.PERIOD + isbn, wci);
51      }
52  
53      private AmazonRankingsUtil() {
54          _amazonLicenseKeys = new Vector<String>();
55  
56          for (int i = 0; i < 1000; i++) {
57              String key = PropsUtil.get(PropsUtil.AMAZON_LICENSE + i);
58  
59              if (key == null) {
60                  break;
61              }
62              else {
63                  _amazonLicenseKeys.add(key);
64              }
65          }
66      }
67  
68      private String _getAmazonKey() {
69          if (_amazonLicenseKeys.size() > 0) {
70              _amazonLicenseCount++;
71  
72              if (_amazonLicenseCount >= _amazonLicenseKeys.size()) {
73                  _amazonLicenseCount = 0;
74              }
75  
76              return _amazonLicenseKeys.get(_amazonLicenseCount);
77          }
78          else {
79              return null;
80          }
81      }
82  
83      private static AmazonRankingsUtil _instance = new AmazonRankingsUtil();
84  
85      private List<String> _amazonLicenseKeys;
86      private int _amazonLicenseCount;
87  
88  }