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Java > Open Source Codes > org > ungoverned > oscar > util > MapToDictionary


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.*;
39
40
41 /**
42  * This is a simple class that implements a <tt>Dictionary</tt>
43  * from a <tt>Map</tt>. The resulting dictionary is immutatable.
44 **/

45 public class MapToDictionary extends Dictionary
46 {
47     /**
48      * Map source.
49     **/

50     private Map m_map = null;
51
52     public MapToDictionary(Map map)
53     {
54         m_map = map;
55     }
56
57     public Enumeration elements()
58     {
59         if (m_map == null)
60         {
61             return null;
62         }
63         return new IteratorToEnumeration(m_map.values().iterator());
64     }
65
66     public Object JavaDoc get(Object JavaDoc key)
67     {
68         if (m_map == null)
69         {
70             return null;
71         }
72         return m_map.get(key);
73     }
74
75     public boolean isEmpty()
76     {
77         if (m_map == null)
78         {
79             return true;
80         }
81         return m_map.isEmpty();
82     }
83
84     public Enumeration keys()
85     {
86         if (m_map == null)
87         {
88             return null;
89         }
90         return new IteratorToEnumeration(m_map.keySet().iterator());
91     }
92
93     public Object JavaDoc put(Object JavaDoc key, Object JavaDoc value)
94     {
95         throw new UnsupportedOperationException JavaDoc();
96     }
97
98     public Object JavaDoc remove(Object JavaDoc key)
99     {
100         throw new UnsupportedOperationException JavaDoc();
101     }
102
103     public int size()
104     {
105         if (m_map == null)
106         {
107             return 0;
108         }
109         return m_map.size();
110     }
111 }
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