1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   *
12   *
13   */
14  
15  package com.liferay.portlet.messageboards.util.comparator;
16  
17  import com.liferay.portal.kernel.util.DateUtil;
18  import com.liferay.portlet.messageboards.model.MBMessage;
19  
20  import java.io.Serializable;
21  
22  import java.util.Comparator;
23  
24  /**
25   * <a href="MessageThreadComparator.java.html"><b><i>View Source</i></b></a>
26   *
27   * @author Brian Wing Shun Chan
28   */
29  public class MessageThreadComparator
30      implements Comparator<MBMessage>, Serializable {
31  
32      public int compare(MBMessage msg1, MBMessage msg2) {
33          Long parentMessageId1 = new Long(msg1.getParentMessageId());
34          Long parentMessageId2 = new Long(msg2.getParentMessageId());
35  
36          int value = parentMessageId1.compareTo(parentMessageId2);
37  
38          if (value == 0) {
39              value = DateUtil.compareTo(
40                  msg1.getCreateDate(), msg2.getCreateDate());
41          }
42  
43          if (value == 0) {
44              Long messageId1 = new Long(msg1.getMessageId());
45              Long messageId2 = new Long(msg2.getMessageId());
46  
47              value = messageId1.compareTo(messageId2);
48          }
49  
50          return value;
51      }
52  
53  }