| MessageThreadComparator.java |
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.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 }