CaseInsensitiveMap


1   /*
2    * Oscar - An implementation of the OSGi framework.
3    * Copyright (c) 2004, Richard S. Hall
4    * All rights reserved.
5    *  
6    * Redistribution and use in source and binary forms, with or without
7    * modification, are permitted provided that the following conditions
8    * are met:
9    *  
10   *   * Redistributions of source code must retain the above copyright
11   *     notice, this list of conditions and the following disclaimer.
12   *   * Redistributions in binary form must reproduce the above copyright
13   *     notice, this list of conditions and the following disclaimer in
14   *     the documentation and/or other materials provided with the
15   *     distribution.
16   *   * Neither the name of the ungoverned.org nor the names of its
17   *     contributors may be used to endorse or promote products derived
18   *     from this software without specific prior written permission.
19   *  
20   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31   * 
32   * Contact: Richard S. Hall (heavy@ungoverned.org)
33   * Contributor(s):
34   *
35  **/
36  package org.ungoverned.oscar.util;
37  
38  import java.util.Comparator  ;
39  import java.util.Map  ;
40  import java.util.TreeMap  ;
41  
42  /**
43   * Simple utility class that creates a case-insensitive map by
44   * extending <tt>TreeMap</tt> and to use a case-insensitive
45   * comparator. Any keys put into this map will be converted to
46   * a <tt>String</tt> using the <tt>toString()</tt> method,
47   * since it is intended to compare strings.
48  **/
49  public class CaseInsensitiveMap extends TreeMap  
50  {
51      public CaseInsensitiveMap()
52      {
53          super(new Comparator  () {
54              public int compare(Object   o1, Object   o2)
55              {
56                  return o1.toString().compareToIgnoreCase(o2.toString());
57              }
58          });
59      }
60      
61      public CaseInsensitiveMap(Map   map)
62      {
63          this();
64          putAll(map);
65      }
66      
67      public Object   put(Object   key, Object   value)
68      {
69          return super.put(key.toString(), value);
70      }
71  }
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