001    /**
002     * Copyright (c) 2000-2013 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.util.Enumeration;
018    import java.util.Properties;
019    import java.util.Vector;
020    
021    /**
022     * @author Brian Wing Shun Chan
023     */
024    public class OrderedProperties extends Properties {
025    
026            public OrderedProperties() {
027                    super();
028    
029                    _names = new Vector<String>();
030            }
031    
032            @Override
033            public Enumeration<String> propertyNames() {
034                    return _names.elements();
035            }
036    
037            @Override
038            public Object put(Object key, Object value) {
039                    if (_names.contains(key)) {
040                            _names.remove(key);
041                    }
042    
043                    _names.add((String)key);
044    
045                    return super.put(key, value);
046            }
047    
048            @Override
049            public Object remove(Object key) {
050                    _names.remove(key);
051    
052                    return super.remove(key);
053            }
054    
055            private Vector<String> _names;
056    
057    }