    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}