001    /**
002     * Copyright (c) 2000-2010 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.blogs.util.comparator;
016    
017    import com.liferay.portal.kernel.util.DateUtil;
018    import com.liferay.portal.kernel.util.OrderByComparator;
019    import com.liferay.portlet.blogs.model.BlogsEntry;
020    
021    /**
022     * @author Alexander Chow
023     */
024    public class EntryDisplayDateComparator extends OrderByComparator {
025    
026            public static String ORDER_BY_ASC = "displayDate ASC, entryId ASC";
027    
028            public static String ORDER_BY_DESC = "displayDate DESC, entryId DESC";
029    
030            public static String[] ORDER_BY_FIELDS = {"displayDate", "entryId"};
031    
032            public EntryDisplayDateComparator() {
033                    this(false);
034            }
035    
036            public EntryDisplayDateComparator(boolean ascending) {
037                    _ascending = ascending;
038            }
039    
040            public int compare(Object obj1, Object obj2) {
041                    BlogsEntry entry1 = (BlogsEntry)obj1;
042                    BlogsEntry entry2 = (BlogsEntry)obj2;
043    
044                    int value = DateUtil.compareTo(
045                            entry1.getDisplayDate(), entry2.getDisplayDate());
046    
047                    if (value == 0) {
048                            if (entry1.getEntryId() < entry2.getEntryId()) {
049                                    value = -1;
050                            }
051                            else if (entry1.getEntryId() > entry2.getEntryId()) {
052                                    value = 1;
053                            }
054                    }
055    
056                    if (_ascending) {
057                            return value;
058                    }
059                    else {
060                            return -value;
061                    }
062            }
063    
064            public String getOrderBy() {
065                    if (_ascending) {
066                            return ORDER_BY_ASC;
067                    }
068                    else {
069                            return ORDER_BY_DESC;
070                    }
071            }
072    
073            public String[] getOrderByFields() {
074                    return ORDER_BY_FIELDS;
075            }
076    
077            public boolean isAscending() {
078                    return _ascending;
079            }
080    
081            private boolean _ascending;
082    
083    }