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 }