001    /**
002     * Copyright (c) 2000-2011 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.portal.kernel.util;
016    
017    import java.io.Serializable;
018    
019    import java.util.Comparator;
020    
021    /**
022     * @author Brian Wing Shun Chan
023     */
024    public class StringComparator implements Comparator<String>, Serializable {
025    
026            public StringComparator() {
027                    this(true, false);
028            }
029    
030            public StringComparator(boolean ascending, boolean caseSensitive) {
031                    _ascending = ascending;
032                    _caseSensitive = caseSensitive;
033            }
034    
035            public int compare(String s1, String s2) {
036                    if (s1 == null) {
037                            s1 = StringPool.BLANK;
038                    }
039    
040                    if (s2 == null) {
041                            s2 = StringPool.BLANK;
042                    }
043    
044                    if (!_ascending) {
045                            String temp = s1;
046    
047                            s1 = s2;
048                            s2 = temp;
049                    }
050    
051                    if (_caseSensitive) {
052                            return s1.compareTo(s2);
053                    }
054                    else {
055                            return s1.compareToIgnoreCase(s2);
056                    }
057            }
058    
059            private boolean _ascending;
060            private boolean _caseSensitive;
061    
062    }