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.portal.kernel.util.OrderByComparator;
24  import com.liferay.portlet.messageboards.model.MBThread;
25  
26  import java.util.Date;
27  
28  /**
29   * <a href="ThreadLastPostDateComparator.java.html"><b><i>View Source</i></b>
30   * </a>
31   *
32   * @author Brian Wing Shun Chan
33   *
34   */
35  public class ThreadLastPostDateComparator extends OrderByComparator {
36  
37      public static String ORDER_BY_ASC = "lastPostDate ASC";
38  
39      public static String ORDER_BY_DESC = "lastPostDate DESC";
40  
41      public ThreadLastPostDateComparator() {
42          this(false);
43      }
44  
45      public ThreadLastPostDateComparator(boolean asc) {
46          _asc = asc;
47      }
48  
49      public int compare(Object obj1, Object obj2) {
50          MBThread thread1 = (MBThread)obj1;
51          MBThread thread2 = (MBThread)obj2;
52  
53          Date lastPostDate1 = thread1.getLastPostDate();
54          Date lastPostDate2 = thread2.getLastPostDate();
55  
56          if ((lastPostDate1 == null) || (lastPostDate2 == null)) {
57              return 0;
58          }
59  
60          int value = DateUtil.compareTo(lastPostDate1, lastPostDate2);
61  
62          if (_asc) {
63              return value;
64          }
65          else {
66              return -value;
67          }
68      }
69  
70      public String getOrderBy() {
71          if (_asc) {
72              return ORDER_BY_ASC;
73          }
74          else {
75              return ORDER_BY_DESC;
76          }
77      }
78  
79      private boolean _asc;
80  
81  }