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Types that extend and augment the Java Collections Framework.
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/* ====================================================================
 * The Apache Software License, Version 1.1
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 * Copyright (c) 2003-2004 The Apache Software Foundation.  All rights
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 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
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 *    Alternately, this acknowledgement may appear in the software itself,
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package org.apache.commons.collections.bidimap;

import org.apache.commons.collections.OrderedBidiMap;
import org.apache.commons.collections.OrderedMapIterator;

/** 
 * Provides a base decorator that enables additional functionality to be added
 * to an OrderedBidiMap via decoration.
 * 
 * Methods are forwarded directly to the decorated map.
 * 
 * This implementation does not perform any special processing with the map views.
 * Instead it simply returns the inverse 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 21:43:16 $
 * 
 * @author Stephen Colebourne
 */
public abstract class AbstractOrderedBidiMapDecorator
        extends AbstractBidiMapDecorator implements OrderedBidiMap {
    
    /**
     * Constructor that wraps (not copies).
     *
     * @param map  the map to decorate, must not be null
     * @throws IllegalArgumentException if the collection is null
     */
    protected AbstractOrderedBidiMapDecorator(OrderedBidiMap map) {
        super(map);
    }

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

    //-----------------------------------------------------------------------
    public OrderedMapIterator orderedMapIterator() {
        return getOrderedBidiMap().orderedMapIterator();
    }

    public Object firstKey() {
        return getOrderedBidiMap().firstKey();
    }

    public Object lastKey() {
        return getOrderedBidiMap().lastKey();
    }

    public Object nextKey(Object key) {
        return getOrderedBidiMap().nextKey(key);
    }

    public Object previousKey(Object key) {
        return getOrderedBidiMap().previousKey(key);
    }

    public OrderedBidiMap inverseOrderedBidiMap() {
        return getOrderedBidiMap().inverseOrderedBidiMap();
    }

}