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 static String[] ORDER_BY_FIELDS = {"lastPostDate"};
42  
43      public ThreadLastPostDateComparator() {
44          this(false);
45      }
46  
47      public ThreadLastPostDateComparator(boolean asc) {
48          _asc = asc;
49      }
50  
51      public int compare(Object obj1, Object obj2) {
52          MBThread thread1 = (MBThread)obj1;
53          MBThread thread2 = (MBThread)obj2;
54  
55          Date lastPostDate1 = thread1.getLastPostDate();
56          Date lastPostDate2 = thread2.getLastPostDate();
57  
58          if ((lastPostDate1 == null) || (lastPostDate2 == null)) {
59              return 0;
60          }
61  
62          int value = DateUtil.compareTo(lastPostDate1, lastPostDate2);
63  
64          if (_asc) {
65              return value;
66          }
67          else {
68              return -value;
69          }
70      }
71  
72      public String getOrderBy() {
73          if (_asc) {
74              return ORDER_BY_ASC;
75          }
76          else {
77              return ORDER_BY_DESC;
78          }
79      }
80  
81      public String[] getOrderByFields() {
82          return ORDER_BY_FIELDS;
83      }
84  
85      public boolean isAscending() {
86          return _asc;
87      }
88  
89      private boolean _asc;
90  
91  }