| MessageThreadComparator.java |
1 /**
2 * Copyright (c) 2000-2009 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
39 implements Comparator<MBMessage>, Serializable {
40
41 public int compare(MBMessage msg1, MBMessage msg2) {
42 Long parentMessageId1 = new Long(msg1.getParentMessageId());
43 Long parentMessageId2 = new Long(msg2.getParentMessageId());
44
45 int value = parentMessageId1.compareTo(parentMessageId2);
46
47 if (value == 0) {
48 value = DateUtil.compareTo(
49 msg1.getCreateDate(), msg2.getCreateDate());
50 }
51
52 if (value == 0) {
53 Long messageId1 = new Long(msg1.getMessageId());
54 Long messageId2 = new Long(msg2.getMessageId());
55
56 value = messageId1.compareTo(messageId2);
57 }
58
59 return value;
60 }
61
62 }