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.journal.util.comparator;
016    
017    import com.liferay.portal.kernel.util.DateUtil;
018    import com.liferay.portal.kernel.util.OrderByComparator;
019    import com.liferay.portlet.journal.model.JournalArticle;
020    
021    /**
022     * @author Brian Wing Shun Chan
023     */
024    public class ArticleDisplayDateComparator
025            extends OrderByComparator<JournalArticle> {
026    
027            public static final String ORDER_BY_ASC = "displayDate ASC, version ASC";
028    
029            public static final String ORDER_BY_DESC = "displayDate DESC, version DESC";
030    
031            public static final String[] ORDER_BY_FIELDS = {"displayDate", "version"};
032    
033            public ArticleDisplayDateComparator() {
034                    this(false);
035            }
036    
037            public ArticleDisplayDateComparator(boolean ascending) {
038                    _ascending = ascending;
039            }
040    
041            @Override
042            public int compare(JournalArticle article1, JournalArticle article2) {
043                    int value = DateUtil.compareTo(
044                            article1.getDisplayDate(), article2.getDisplayDate());
045    
046                    if (value == 0) {
047                            if (article1.getVersion() < article2.getVersion()) {
048                                    value = -1;
049                            }
050                            else if (article1.getVersion() > article2.getVersion()) {
051                                    value = 1;
052                            }
053                    }
054    
055                    if (_ascending) {
056                            return value;
057                    }
058                    else {
059                            return -value;
060                    }
061            }
062    
063            @Override
064            public String getOrderBy() {
065                    if (_ascending) {
066                            return ORDER_BY_ASC;
067                    }
068                    else {
069                            return ORDER_BY_DESC;
070                    }
071            }
072    
073            @Override
074            public String[] getOrderByFields() {
075                    return ORDER_BY_FIELDS;
076            }
077    
078            @Override
079            public boolean isAscending() {
080                    return _ascending;
081            }
082    
083            private final boolean _ascending;
084    
085    }