1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17   * SOFTWARE.
18   */
19  
20  package com.liferay.portal.kernel.util;
21  
22  import java.util.Enumeration;
23  import java.util.Properties;
24  import java.util.Vector;
25  
26  /**
27   * <a href="OrderedProperties.java.html"><b><i>View Source</i></b></a>
28   *
29   * @author Brian Wing Shun Chan
30   *
31   */
32  public class OrderedProperties extends Properties {
33  
34      public OrderedProperties() {
35          super();
36  
37          _names = new Vector<String>();
38      }
39  
40      public Enumeration<String> propertyNames() {
41          return _names.elements();
42      }
43  
44      public Object put(Object key, Object value) {
45          if (_names.contains(key)) {
46              _names.remove(key);
47          }
48  
49          _names.add((String)key);
50  
51          return super.put(key, value);
52      }
53  
54      public Object remove(Object key) {
55          _names.remove(key);
56  
57          return super.remove(key);
58      }
59  
60      private Vector<String> _names;
61  
62  }