1   /**
2    * Copyright (c) 2000-2009 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.io.PrintStream;
26  import java.io.PrintWriter;
27  
28  import java.util.Collections;
29  import java.util.Enumeration;
30  import java.util.Properties;
31  import java.util.Set;
32  import java.util.TreeSet;
33  
34  /**
35   * <a href="SortedProperties.java.html"><b><i>View Source</i></b></a>
36   *
37   * @author Brian Wing Shun Chan
38   *
39   */
40  public class SortedProperties extends Properties {
41  
42      public SortedProperties() {
43          super();
44  
45          _names = new TreeSet<String>();
46      }
47  
48      public SortedProperties(Properties properties) {
49          this();
50  
51          Enumeration<String> enu =
52              (Enumeration<String>)properties.propertyNames();
53  
54          while (enu.hasMoreElements()) {
55              String key = enu.nextElement();
56  
57              String value = properties.getProperty(key);
58  
59              setProperty(key, value);
60          }
61      }
62  
63      public void clear() {
64          super.clear();
65  
66          _names.clear();
67      }
68  
69      public void list(PrintStream out) {
70          System.out.println("-- listing properties --");
71  
72          Enumeration<String> enu = propertyNames();
73  
74          while (enu.hasMoreElements()) {
75              String name = enu.nextElement();
76  
77              out.println(name + StringPool.EQUAL + getProperty(name));
78          }
79      }
80  
81      public void list(PrintWriter out) {
82          System.out.println("-- listing properties --");
83  
84          Enumeration<String> enu = propertyNames();
85  
86          while (enu.hasMoreElements()) {
87              String name = enu.nextElement();
88  
89              out.println(name + StringPool.EQUAL + getProperty(name));
90          }
91      }
92  
93      public Enumeration<String> propertyNames() {
94          return Collections.enumeration(_names);
95      }
96  
97      public Object put(String key, String value) {
98          if (_names.contains(key)) {
99              _names.remove(key);
100         }
101 
102         _names.add(key);
103 
104         return super.put(key, value);
105     }
106 
107     public Object remove(Object key) {
108         _names.remove(key);
109 
110         return super.remove(key);
111     }
112 
113     public Object setProperty(String key, String value) {
114         return put(key, value);
115     }
116 
117     private Set<String> _names;
118 
119 }