001    /**
002     * Copyright (c) 2000-2013 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            @Override
036            public int compare(String s1, String s2) {
037                    if (s1 == null) {
038                            s1 = StringPool.BLANK;
039                    }
040    
041                    if (s2 == null) {
042                            s2 = StringPool.BLANK;
043                    }
044    
045                    if (!_ascending) {
046                            String temp = s1;
047    
048                            s1 = s2;
049                            s2 = temp;
050                    }
051    
052                    if (_caseSensitive) {
053                            return s1.compareTo(s2);
054                    }
055                    else {
056                            return s1.compareToIgnoreCase(s2);
057                    }
058            }
059    
060            private boolean _ascending;
061            private boolean _caseSensitive;
062    
063    }