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.wiki.util.comparator;
016    
017    import com.liferay.portal.kernel.util.OrderByComparator;
018    import com.liferay.portlet.wiki.model.WikiPage;
019    
020    /**
021     * @author Bruno Farache
022     */
023    public class PageVersionComparator extends OrderByComparator<WikiPage> {
024    
025            public static final String ORDER_BY_ASC = "WikiPage.version ASC";
026    
027            public static final String ORDER_BY_DESC = "WikiPage.version DESC";
028    
029            public static final String[] ORDER_BY_FIELDS = {"version"};
030    
031            public PageVersionComparator() {
032                    this(false);
033            }
034    
035            public PageVersionComparator(boolean ascending) {
036                    _ascending = ascending;
037            }
038    
039            @Override
040            public int compare(WikiPage page1, WikiPage page2) {
041                    int value = 0;
042    
043                    if (page1.getVersion() < page2.getVersion()) {
044                            value = -1;
045                    }
046                    else if (page1.getVersion() > page2.getVersion()) {
047                            value = 1;
048                    }
049    
050                    if (_ascending) {
051                            return value;
052                    }
053                    else {
054                            return -value;
055                    }
056            }
057    
058            @Override
059            public String getOrderBy() {
060                    if (_ascending) {
061                            return ORDER_BY_ASC;
062                    }
063                    else {
064                            return ORDER_BY_DESC;
065                    }
066            }
067    
068            @Override
069            public String[] getOrderByFields() {
070                    return ORDER_BY_FIELDS;
071            }
072    
073            @Override
074            public boolean isAscending() {
075                    return _ascending;
076            }
077    
078            private final boolean _ascending;
079    
080    }