1   /**
2    * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.kernel.util;
24  
25  import java.util.Enumeration;
26  import java.util.Properties;
27  import java.util.Vector;
28  
29  /**
30   * <a href="OrderedProperties.java.html"><b><i>View Source</i></b></a>
31   *
32   * @author Brian Wing Shun Chan
33   *
34   */
35  public class OrderedProperties extends Properties {
36  
37      public OrderedProperties() {
38          super();
39  
40          _names = new Vector<String>();
41      }
42  
43      public Enumeration<String> propertyNames() {
44          return _names.elements();
45      }
46  
47      public Object put(Object key, Object value) {
48          if (_names.contains(key)) {
49              _names.remove(key);
50          }
51  
52          _names.add((String)key);
53  
54          return super.put(key, value);
55      }
56  
57      public Object remove(Object key) {
58          _names.remove(key);
59  
60          return super.remove(key);
61      }
62  
63      private Vector<String> _names;
64  
65  }