001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
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    }