001    /**
002     * Copyright (c) 2000-present 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<MBThread> {
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(MBThread thread1, MBThread thread2) {
050                    Date lastPostDate1 = thread1.getLastPostDate();
051                    Date lastPostDate2 = thread2.getLastPostDate();
052    
053                    boolean ignoreMilliseconds = false;
054    
055                    DB db = DBFactoryUtil.getDB();
056    
057                    if (!db.isSupportsDateMilliseconds()) {
058                            ignoreMilliseconds = true;
059                    }
060    
061                    int value = DateUtil.compareTo(
062                            lastPostDate1, lastPostDate2, ignoreMilliseconds);
063    
064                    if (value == 0) {
065                            if (thread1.getThreadId() < thread2.getThreadId()) {
066                                    value = -1;
067                            }
068                            else if (thread1.getThreadId() > thread2.getThreadId()) {
069                                    value = 1;
070                            }
071                    }
072    
073                    if (_ascending) {
074                            return value;
075                    }
076                    else {
077                            return -value;
078                    }
079            }
080    
081            @Override
082            public String getOrderBy() {
083                    if (_ascending) {
084                            return ORDER_BY_ASC;
085                    }
086                    else {
087                            return ORDER_BY_DESC;
088                    }
089            }
090    
091            @Override
092            public String[] getOrderByConditionFields() {
093                    return ORDER_BY_CONDITION_FIELDS;
094            }
095    
096            @Override
097            public String[] getOrderByFields() {
098                    return ORDER_BY_FIELDS;
099            }
100    
101            @Override
102            public boolean isAscending() {
103                    return _ascending;
104            }
105    
106            private final boolean _ascending;
107    
108    }