001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portlet.messageboards.util.comparator;
016    
017    import com.liferay.portal.kernel.dao.db.DB;
018    import com.liferay.portal.kernel.dao.db.DBFactoryUtil;
019    import com.liferay.portal.kernel.util.DateUtil;
020    import com.liferay.portal.kernel.util.OrderByComparator;
021    import com.liferay.portlet.messageboards.model.MBThread;
022    
023    import java.util.Date;
024    
025    /**
026     * @author Brian Wing Shun Chan
027     */
028    public class ThreadLastPostDateComparator extends OrderByComparator {
029    
030            public static final String ORDER_BY_ASC =
031                    "MBThread.lastPostDate ASC, MBThread.threadId ASC";
032    
033            public static final String[] ORDER_BY_CONDITION_FIELDS = {"lastPostDate"};
034    
035            public static final String ORDER_BY_DESC =
036                    "MBThread.lastPostDate DESC, MBThread.threadId DESC";
037    
038            public static final String[] ORDER_BY_FIELDS = {"lastPostDate", "threadId"};
039    
040            public ThreadLastPostDateComparator() {
041                    this(false);
042            }
043    
044            public ThreadLastPostDateComparator(boolean ascending) {
045                    _ascending = ascending;
046            }
047    
048            @Override
049            public int compare(Object obj1, Object obj2) {
050                    MBThread thread1 = (MBThread)obj1;
051                    MBThread thread2 = (MBThread)obj2;
052    
053                    Date lastPostDate1 = thread1.getLastPostDate();
054                    Date lastPostDate2 = thread2.getLastPostDate();
055    
056                    boolean ignoreMilliseconds = false;
057    
058                    DB db = DBFactoryUtil.getDB();
059    
060                    if (!db.isSupportsDateMilliseconds()) {
061                            ignoreMilliseconds = true;
062                    }
063    
064                    int value = DateUtil.compareTo(
065                            lastPostDate1, lastPostDate2, ignoreMilliseconds);
066    
067                    if (value == 0) {
068                            if (thread1.getThreadId() < thread2.getThreadId()) {
069                                    value = -1;
070                            }
071                            else if (thread1.getThreadId() > thread2.getThreadId()) {
072                                    value = 1;
073                            }
074                    }
075    
076                    if (_ascending) {
077                            return value;
078                    }
079                    else {
080                            return -value;
081                    }
082            }
083    
084            @Override
085            public String getOrderBy() {
086                    if (_ascending) {
087                            return ORDER_BY_ASC;
088                    }
089                    else {
090                            return ORDER_BY_DESC;
091                    }
092            }
093    
094            @Override
095            public String[] getOrderByConditionFields() {
096                    return ORDER_BY_CONDITION_FIELDS;
097            }
098    
099            @Override
100            public String[] getOrderByFields() {
101                    return ORDER_BY_FIELDS;
102            }
103    
104            @Override
105            public boolean isAscending() {
106                    return _ascending;
107            }
108    
109            private boolean _ascending;
110    
111    }