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.OrderByComparator;
018    import com.liferay.portal.kernel.util.StringUtil;
019    import com.liferay.portlet.journal.model.JournalArticle;
020    
021    /**
022     * @author Brian Wing Shun Chan
023     */
024    public class ArticleIDComparator extends OrderByComparator<JournalArticle> {
025    
026            public static final String ORDER_BY_ASC =
027                    "JournalArticle.articleId ASC, JournalArticle.version ASC";
028    
029            public static final String ORDER_BY_DESC =
030                    "JournalArticle.articleId DESC, JournalArticle.version DESC";
031    
032            public static final String[] ORDER_BY_FIELDS = {"articleId", "version"};
033    
034            public ArticleIDComparator() {
035                    this(false);
036            }
037    
038            public ArticleIDComparator(boolean ascending) {
039                    _ascending = ascending;
040            }
041    
042            @Override
043            public int compare(JournalArticle article1, JournalArticle article2) {
044                    String articleId1 = StringUtil.toLowerCase(article1.getArticleId());
045                    String articleId2 = StringUtil.toLowerCase(article2.getArticleId());
046    
047                    int value = articleId1.compareTo(articleId2);
048    
049                    if (value == 0) {
050                            if (article1.getVersion() < article2.getVersion()) {
051                                    value = -1;
052                            }
053                            else if (article1.getVersion() > article2.getVersion()) {
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[] getOrderByFields() {
078                    return ORDER_BY_FIELDS;
079            }
080    
081            @Override
082            public boolean isAscending() {
083                    return _ascending;
084            }
085    
086            private final boolean _ascending;
087    
088    }