001    /* 
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *   http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    package org.apache.felix.framework.util;
020    
021    import java.util.*;
022    
023    
024    /**
025     * This is a simple class that implements a <tt>Dictionary</tt>
026     * from a <tt>Map</tt>. The resulting dictionary is immutable.
027    **/
028    public class MapToDictionary extends Dictionary
029    {
030        /**
031         * Map source.
032        **/
033        private Map m_map = null;
034    
035        public MapToDictionary(Map map)
036        {
037            if (map == null)
038            {
039                throw new IllegalArgumentException("Source map cannot be null.");
040            }
041            m_map = map;
042        }
043    
044        public Enumeration elements()
045        {
046            return new IteratorToEnumeration(m_map.values().iterator());
047        }
048    
049        public Object get(Object key)
050        {
051            return m_map.get(key);
052        }
053    
054        public boolean isEmpty()
055        {
056            return m_map.isEmpty();
057        }
058    
059        public Enumeration keys()
060        {
061            return new IteratorToEnumeration(m_map.keySet().iterator());
062        }
063    
064        public Object put(Object key, Object value)
065        {
066            throw new UnsupportedOperationException();
067        }
068    
069        public Object remove(Object key)
070        {
071            throw new UnsupportedOperationException();
072        }
073    
074        public int size()
075        {
076            return m_map.size();
077        }
078    
079        public String toString()
080        {
081            return m_map.toString();
082        }
083    }