org.apache.felix.bundlerepository/src/main/java/org/apache/felix/bundlerepository/MapToDictionary.java

/*
 *   Copyright 2005 The Apache Software Foundation
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */
package org.apache.felix.bundlerepository;

import java.util.*;


/**
 * This is a simple class that implements a <tt>Dictionary</tt>
 * from a <tt>Map</tt>. The resulting dictionary is immutatable.
**/
public class MapToDictionary extends Dictionary
{
    /**
     * Map source.
    **/
    private Map m_map = null;

    public MapToDictionary(Map map)
    {
        m_map = map;
    }

    public void setSourceMap(Map map)
    {
        m_map = map;
    }

    public Enumeration elements()
    {
        if (m_map == null)
        {
            return null;
        }
        return new IteratorToEnumeration(m_map.values().iterator());
    }

    public Object get(Object key)
    {
        if (m_map == null)
        {
            return null;
        }
        return m_map.get(key);
    }

    public boolean isEmpty()
    {
        if (m_map == null)
        {
            return true;
        }
        return m_map.isEmpty();
    }

    public Enumeration keys()
    {
        if (m_map == null)
        {
            return null;
        }
        return new IteratorToEnumeration(m_map.keySet().iterator());
    }

    public Object put(Object key, Object value)
    {
        throw new UnsupportedOperationException();
    }

    public Object remove(Object key)
    {
        throw new UnsupportedOperationException();
    }

    public int size()
    {
        if (m_map == null)
        {
            return 0;
        }
        return m_map.size();
    }
}