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.dao.db.DB;
26  import com.liferay.portal.kernel.dao.db.DBFactoryUtil;
27  import com.liferay.portal.kernel.util.DateUtil;
28  import com.liferay.portal.kernel.util.OrderByComparator;
29  import com.liferay.portlet.messageboards.model.MBThread;
30  
31  import java.util.Date;
32  
33  /**
34   * <a href="ThreadLastPostDateComparator.java.html"><b><i>View Source</i></b>
35   * </a>
36   *
37   * @author Brian Wing Shun Chan
38   */
39  public class ThreadLastPostDateComparator extends OrderByComparator {
40  
41      public static String ORDER_BY_ASC = "lastPostDate ASC, threadId ASC";
42  
43      public static String ORDER_BY_DESC = "lastPostDate DESC, threadId DESC";
44  
45      public static String[] ORDER_BY_FIELDS = {"lastPostDate, threadId"};
46  
47      public ThreadLastPostDateComparator() {
48          this(false);
49      }
50  
51      public ThreadLastPostDateComparator(boolean asc) {
52          _asc = asc;
53      }
54  
55      public int compare(Object obj1, Object obj2) {
56          MBThread thread1 = (MBThread)obj1;
57          MBThread thread2 = (MBThread)obj2;
58  
59          Date lastPostDate1 = thread1.getLastPostDate();
60          Date lastPostDate2 = thread2.getLastPostDate();
61  
62          boolean ignoreMilliseconds = false;
63  
64          DB db = DBFactoryUtil.getDB();
65  
66          if (!db.isSupportsDateMilliseconds()) {
67              ignoreMilliseconds = true;
68          }
69  
70          int value = DateUtil.compareTo(
71              lastPostDate1, lastPostDate2, ignoreMilliseconds);
72  
73          if (value == 0) {
74              if (thread1.getThreadId() < thread2.getThreadId()) {
75                  value = -1;
76              }
77              else if (thread1.getThreadId() > thread2.getThreadId()) {
78                  value = 1;
79              }
80          }
81  
82          if (_asc) {
83              return value;
84          }
85          else {
86              return -value;
87          }
88      }
89  
90      public String getOrderBy() {
91          if (_asc) {
92              return ORDER_BY_ASC;
93          }
94          else {
95              return ORDER_BY_DESC;
96          }
97      }
98  
99      public String[] getOrderByFields() {
100         return ORDER_BY_FIELDS;
101     }
102 
103     public boolean isAscending() {
104         return _asc;
105     }
106 
107     private boolean _asc;
108 
109 }