1   /**
2    * Copyright (c) 2000-2007 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.messageboards.util.comparator;
24  
25  import com.liferay.portal.kernel.util.DateUtil;
26  import com.liferay.portlet.messageboards.model.MBMessage;
27  
28  import java.io.Serializable;
29  
30  import java.util.Comparator;
31  
32  /**
33   * <a href="MessageThreadComparator.java.html"><b><i>View Source</i></b></a>
34   *
35   * @author Brian Wing Shun Chan
36   *
37   */
38  public class MessageThreadComparator implements Comparator, Serializable {
39  
40      public int compare(Object obj1, Object obj2) {
41          MBMessage msg1 = (MBMessage)obj1;
42          MBMessage msg2 = (MBMessage)obj2;
43  
44          Long parentMessageId1 = new Long(msg1.getParentMessageId());
45          Long parentMessageId2 = new Long(msg2.getParentMessageId());
46  
47          int value = parentMessageId1.compareTo(parentMessageId2);
48  
49          if (value == 0) {
50              value = DateUtil.compareTo(
51                  msg1.getCreateDate(), msg2.getCreateDate());
52          }
53  
54          if (value == 0) {
55              Long messageId1 = new Long(msg1.getMessageId());
56              Long messageId2 = new Long(msg2.getMessageId());
57  
58              value = messageId1.compareTo(messageId2);
59          }
60  
61          return value;
62      }
63  
64  }