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Types that extend and augment the Java Collections Framework.
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/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003-2004 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache"
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 *
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 */
package org.apache.commons.collections.map;

import java.util.Collection;
import java.util.Map;
import java.util.Set;

/**
 * Provides a base decorator that enables additional functionality to be added
 * to a Map via decoration.
 * 
 * Methods are forwarded directly to the decorated map.
 * 
 * This implementation does not perform any special processing with
 * {@link #entrySet()}, {@link #keySet()} or {@link #values()}. Instead
 * it simply returns the set/collection from the wrapped map. This may be
 * undesirable, for example if you are trying to write a validating
 * implementation it would provide a loophole around the validation.
 * But, you might want that loophole, so this class is kept simple.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 1.3 $ $Date: 2004/01/14 21:43:10 $
 * 
 * @author Daniel Rall
 * @author Stephen Colebourne
 */
public abstract class AbstractMapDecorator implements Map {

    /** The map to decorate */
    protected final Map map;

    /**
     * Constructor that wraps (not copies).
     *
     * @param map  the map to decorate, must not be null
     * @throws IllegalArgumentException if the collection is null
     */
    public AbstractMapDecorator(Map map) {
        if (map == null) {
            throw new IllegalArgumentException("Map must not be null");
        }
        this.map = map;
    }

    /**
     * Gets the map being decorated.
     * 
     * @return the decorated map
     */
    protected Map getMap() {
        return map;
    }

    //-----------------------------------------------------------------------
    public void clear() {
        map.clear();
    }

    public boolean containsKey(Object key) {
        return map.containsKey(key);
    }

    public boolean containsValue(Object value) {
        return map.containsValue(value);
    }

    public Set entrySet() {
        return map.entrySet();
    }

    public Object get(Object key) {
        return map.get(key);
    }

    public boolean isEmpty() {
        return map.isEmpty();
    }

    public Set keySet() {
        return map.keySet();
    }

    public Object put(Object key, Object value) {
        return map.put(key, value);
    }

    public void putAll(Map mapToCopy) {
        map.putAll(mapToCopy);
    }

    public Object remove(Object key) {
        return map.remove(key);
    }

    public int size() {
        return map.size();
    }

    public Collection values() {
        return map.values();
    }
   
    public boolean equals(Object object) {
        if (object == this) {
            return true;
        }
        return map.equals(object);
    }

    public int hashCode() {
        return map.hashCode();
    }

    public String toString() {
        return map.toString();
    }

}