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.iterators;
018
019import java.util.ListIterator;
020
021/**
022 * Provides basic behaviour for decorating a list iterator with extra functionality.
023 * <p>
024 * All methods are forwarded to the decorated list iterator.
025 *
026 * @since 3.0
027 */
028public class AbstractListIteratorDecorator<E> implements ListIterator<E> {
029
030    /** The iterator being decorated */
031    private final ListIterator<E> iterator;
032
033    //-----------------------------------------------------------------------
034    /**
035     * Constructor that decorates the specified iterator.
036     *
037     * @param iterator  the iterator to decorate, must not be null
038     * @throws NullPointerException if the iterator is null
039     */
040    public AbstractListIteratorDecorator(final ListIterator<E> iterator) {
041        super();
042        if (iterator == null) {
043            throw new NullPointerException("ListIterator must not be null");
044        }
045        this.iterator = iterator;
046    }
047
048    /**
049     * Gets the iterator being decorated.
050     *
051     * @return the decorated iterator
052     */
053    protected ListIterator<E> getListIterator() {
054        return iterator;
055    }
056
057    //-----------------------------------------------------------------------
058
059    /** {@inheritDoc} */
060    @Override
061    public boolean hasNext() {
062        return iterator.hasNext();
063    }
064
065    /** {@inheritDoc} */
066    @Override
067    public E next() {
068        return iterator.next();
069    }
070
071    /** {@inheritDoc} */
072    @Override
073    public int nextIndex() {
074        return iterator.nextIndex();
075    }
076
077    /** {@inheritDoc} */
078    @Override
079    public boolean hasPrevious() {
080        return iterator.hasPrevious();
081    }
082
083    /** {@inheritDoc} */
084    @Override
085    public E previous() {
086        return iterator.previous();
087    }
088
089    /** {@inheritDoc} */
090    @Override
091    public int previousIndex() {
092        return iterator.previousIndex();
093    }
094
095    /** {@inheritDoc} */
096    @Override
097    public void remove() {
098        iterator.remove();
099    }
100
101    /** {@inheritDoc} */
102    @Override
103    public void set(final E obj) {
104        iterator.set(obj);
105    }
106
107    /** {@inheritDoc} */
108    @Override
109    public void add(final E obj) {
110        iterator.add(obj);
111    }
112
113}