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.mail.util.comparator;
24  
25  import com.liferay.portal.kernel.util.DateUtil;
26  import com.liferay.portal.kernel.util.GetterUtil;
27  import com.liferay.portlet.mail.model.MailEnvelope;
28  
29  import java.util.Comparator;
30  
31  /**
32   * <a href="SubjectComparator.java.html"><b><i>View Source</i></b></a>
33   *
34   * @author Alexander Chow
35   *
36   */
37  public class SubjectComparator implements Comparator<MailEnvelope> {
38  
39      public SubjectComparator(boolean asc) {
40          _asc = asc;
41      }
42  
43      public int compare(MailEnvelope mailEnvelope1, MailEnvelope mailEnvelope2) {
44          String subject1 = _getSubject(mailEnvelope1.getSubject());
45          String subject2 = _getSubject(mailEnvelope2.getSubject());
46  
47          int value = subject1.compareTo(subject2);
48  
49          if (value == 0) {
50              value = DateUtil.compareTo(
51                  mailEnvelope1.getDate(), mailEnvelope2.getDate());
52          }
53  
54          if (value == 0) {
55              Long messageId1 = new Long(mailEnvelope1.getMessageId());
56              Long messageId2 = new Long(mailEnvelope2.getMessageId());
57  
58              value = messageId1.compareTo(messageId2);
59          }
60  
61          if (_asc) {
62              return value;
63          }
64          else {
65              return -value;
66          }
67      }
68  
69      private String _getSubject(String subject) {
70          subject = GetterUtil.getString(subject).toLowerCase();
71  
72          while (subject.startsWith("re:") || subject.startsWith("re>") ||
73                 subject.startsWith("fw:") || subject.startsWith("fw>")) {
74  
75              subject = subject.substring(3).trim();
76          }
77  
78          return subject;
79      }
80  
81      private boolean _asc;
82  
83  }