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.portal.kernel.util.OrderByComparator;
27  import com.liferay.portlet.messageboards.model.MBThread;
28  
29  import java.util.Date;
30  
31  /**
32   * <a href="ThreadLastPostDateComparator.java.html"><b><i>View Source</i></b>
33   * </a>
34   *
35   * @author Brian Wing Shun Chan
36   *
37   */
38  public class ThreadLastPostDateComparator extends OrderByComparator {
39  
40      public static String ORDER_BY_ASC = "lastPostDate ASC";
41  
42      public static String ORDER_BY_DESC = "lastPostDate DESC";
43  
44      public ThreadLastPostDateComparator() {
45          this(false);
46      }
47  
48      public ThreadLastPostDateComparator(boolean asc) {
49          _asc = asc;
50      }
51  
52      public int compare(Object obj1, Object obj2) {
53          MBThread thread1 = (MBThread)obj1;
54          MBThread thread2 = (MBThread)obj2;
55  
56          Date lastPostDate1 = thread1.getLastPostDate();
57          Date lastPostDate2 = thread2.getLastPostDate();
58  
59          if ((lastPostDate1 == null) || (lastPostDate2 == null)) {
60              return 0;
61          }
62  
63          int value = DateUtil.compareTo(lastPostDate1, lastPostDate2);
64  
65          if (_asc) {
66              return value;
67          }
68          else {
69              return -value;
70          }
71      }
72  
73      public String getOrderBy() {
74          if (_asc) {
75              return ORDER_BY_ASC;
76          }
77          else {
78              return ORDER_BY_DESC;
79          }
80      }
81  
82      private boolean _asc;
83  
84  }