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.util.DateUtil;
018    import com.liferay.portal.kernel.util.OrderByComparator;
019    import com.liferay.portlet.messageboards.model.MBThread;
020    
021    /**
022     * @author Brian Wing Shun Chan
023     */
024    public class ThreadLastPostDateComparator extends OrderByComparator<MBThread> {
025    
026            public static final String ORDER_BY_ASC =
027                    "MBThread.lastPostDate ASC, MBThread.threadId ASC";
028    
029            public static final String[] ORDER_BY_CONDITION_FIELDS = {"lastPostDate"};
030    
031            public static final String ORDER_BY_DESC =
032                    "MBThread.lastPostDate DESC, MBThread.threadId DESC";
033    
034            public static final String[] ORDER_BY_FIELDS = {"lastPostDate", "threadId"};
035    
036            public ThreadLastPostDateComparator() {
037                    this(false);
038            }
039    
040            public ThreadLastPostDateComparator(boolean ascending) {
041                    _ascending = ascending;
042            }
043    
044            @Override
045            public int compare(MBThread thread1, MBThread thread2) {
046                    int value = DateUtil.compareTo(
047                            thread1.getLastPostDate(), thread2.getLastPostDate());
048    
049                    if (value == 0) {
050                            if (thread1.getThreadId() < thread2.getThreadId()) {
051                                    value = -1;
052                            }
053                            else if (thread1.getThreadId() > thread2.getThreadId()) {
054                                    value = 1;
055                            }
056                    }
057    
058                    if (_ascending) {
059                            return value;
060                    }
061                    else {
062                            return -value;
063                    }
064            }
065    
066            @Override
067            public String getOrderBy() {
068                    if (_ascending) {
069                            return ORDER_BY_ASC;
070                    }
071                    else {
072                            return ORDER_BY_DESC;
073                    }
074            }
075    
076            @Override
077            public String[] getOrderByConditionFields() {
078                    return ORDER_BY_CONDITION_FIELDS;
079            }
080    
081            @Override
082            public String[] getOrderByFields() {
083                    return ORDER_BY_FIELDS;
084            }
085    
086            @Override
087            public boolean isAscending() {
088                    return _ascending;
089            }
090    
091            private final boolean _ascending;
092    
093    }