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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

There is a newer version: 4.5.0-M1

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.commons.collections4.bidimap;

import java.util.Set;

import org.apache.commons.collections4.BidiMap;
import org.apache.commons.collections4.MapIterator;
import org.apache.commons.collections4.map.AbstractMapDecorator;

/**
 * Provides a base decorator that enables additional functionality to be added
 * to a BidiMap 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 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.
 *
 * @param  the type of the keys in this map
 * @param  the type of the values in this map
 * @since 3.0
 */
public abstract class AbstractBidiMapDecorator
        extends AbstractMapDecorator implements BidiMap {

    /**
     * Constructor that wraps (not copies).
     *
     * @param map  the map to decorate, must not be null
     * @throws NullPointerException if the collection is null
     */
    protected AbstractBidiMapDecorator(final BidiMap map) {
        super(map);
    }

    /**
     * Gets the map being decorated.
     *
     * @return the decorated map
     */
    @Override
    protected BidiMap decorated() {
        return (BidiMap) super.decorated();
    }

    //-----------------------------------------------------------------------
    @Override
    public MapIterator mapIterator() {
        return decorated().mapIterator();
    }

    @Override
    public K getKey(final Object value) {
        return decorated().getKey(value);
    }

    @Override
    public K removeValue(final Object value) {
        return decorated().removeValue(value);
    }

    @Override
    public BidiMap inverseBidiMap() {
        return decorated().inverseBidiMap();
    }

    @Override
    public Set values() {
        return decorated().values();
    }

}