1   /**
2    * Copyright (c) 2000-2009 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   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17   * SOFTWARE.
18   */
19  
20  package com.liferay.portlet.messageboards.util.comparator;
21  
22  import com.liferay.portal.kernel.util.DateUtil;
23  import com.liferay.portlet.messageboards.model.MBMessage;
24  
25  import java.io.Serializable;
26  
27  import java.util.Comparator;
28  
29  /**
30   * <a href="MessageThreadComparator.java.html"><b><i>View Source</i></b></a>
31   *
32   * @author Brian Wing Shun Chan
33   *
34   */
35  public class MessageThreadComparator
36      implements Comparator<MBMessage>, Serializable {
37  
38      public int compare(MBMessage msg1, MBMessage msg2) {
39          Long parentMessageId1 = new Long(msg1.getParentMessageId());
40          Long parentMessageId2 = new Long(msg2.getParentMessageId());
41  
42          int value = parentMessageId1.compareTo(parentMessageId2);
43  
44          if (value == 0) {
45              value = DateUtil.compareTo(
46                  msg1.getCreateDate(), msg2.getCreateDate());
47          }
48  
49          if (value == 0) {
50              Long messageId1 = new Long(msg1.getMessageId());
51              Long messageId2 = new Long(msg2.getMessageId());
52  
53              value = messageId1.compareTo(messageId2);
54          }
55  
56          return value;
57      }
58  
59  }