001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.collections4.bidimap;
018
019import org.apache.commons.collections4.OrderedBidiMap;
020import org.apache.commons.collections4.OrderedMapIterator;
021
022/**
023 * Provides a base decorator that enables additional functionality to be added
024 * to an OrderedBidiMap via decoration.
025 * <p>
026 * Methods are forwarded directly to the decorated map.
027 * </p>
028 * <p>
029 * This implementation does not perform any special processing with the map views.
030 * Instead it simply returns the inverse from the wrapped map. This may be
031 * undesirable, for example if you are trying to write a validating implementation
032 * it would provide a loophole around the validation.
033 * But, you might want that loophole, so this class is kept simple.
034 * </p>
035 *
036 * @param <K> the type of the keys in this map
037 * @param <V> the type of the values in this map
038 * @since 3.0
039 */
040public abstract class AbstractOrderedBidiMapDecorator<K, V>
041        extends AbstractBidiMapDecorator<K, V>
042        implements OrderedBidiMap<K, V> {
043
044    /**
045     * Constructor that wraps (not copies).
046     *
047     * @param map  the map to decorate, must not be null
048     * @throws NullPointerException if the collection is null
049     */
050    protected AbstractOrderedBidiMapDecorator(final OrderedBidiMap<K, V> map) {
051        super(map);
052    }
053
054    /**
055     * Gets the map being decorated.
056     *
057     * @return the decorated map
058     */
059    @Override
060    protected OrderedBidiMap<K, V> decorated() {
061        return (OrderedBidiMap<K, V>) super.decorated();
062    }
063
064    @Override
065    public K firstKey() {
066        return decorated().firstKey();
067    }
068
069    @Override
070    public OrderedBidiMap<V, K> inverseBidiMap() {
071        return decorated().inverseBidiMap();
072    }
073
074    @Override
075    public K lastKey() {
076        return decorated().lastKey();
077    }
078
079    @Override
080    public OrderedMapIterator<K, V> mapIterator() {
081        return decorated().mapIterator();
082    }
083
084    @Override
085    public K nextKey(final K key) {
086        return decorated().nextKey(key);
087    }
088
089    @Override
090    public K previousKey(final K key) {
091        return decorated().previousKey(key);
092    }
093
094}