1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portlet.amazonrankings;
16  
17  import com.liferay.portlet.amazonrankings.model.AmazonRankings;
18  import com.liferay.portlet.amazonrankings.util.AmazonRankingsUtil;
19  
20  import java.util.ArrayList;
21  import java.util.List;
22  
23  import javax.portlet.PortletPreferences;
24  import javax.portlet.PreferencesValidator;
25  import javax.portlet.ValidatorException;
26  
27  /**
28   * <a href="AmazonRankingsPreferencesValidator.java.html"><b><i>View Source</i>
29   * </b></a>
30   *
31   * @author Brian Wing Shun Chan
32   */
33  public class AmazonRankingsPreferencesValidator
34      implements PreferencesValidator {
35  
36      public void validate(PortletPreferences preferences)
37          throws ValidatorException {
38  
39          List<String> badIsbns = new ArrayList<String>();
40  
41          String[] isbns = preferences.getValues("isbns", new String[0]);
42  
43          for (int i = 0; i < isbns.length; i++) {
44              AmazonRankings amazonRankings =
45                  AmazonRankingsUtil.getAmazonRankings(isbns[i]);
46  
47              if (amazonRankings == null) {
48                  badIsbns.add(isbns[i]);
49              }
50          }
51  
52          if (badIsbns.size() > 0) {
53              throw new ValidatorException(
54                  "Failed to retrieve ISBNs", badIsbns);
55          }
56      }
57  
58  }