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 * @version $Id: AbstractListIteratorDecorator.html 972421 2015-11-14 20:00:04Z tn $ 028 */ 029public class AbstractListIteratorDecorator<E> implements ListIterator<E> { 030 031 /** The iterator being decorated */ 032 private final ListIterator<E> iterator; 033 034 //----------------------------------------------------------------------- 035 /** 036 * Constructor that decorates the specified iterator. 037 * 038 * @param iterator the iterator to decorate, must not be null 039 * @throws IllegalArgumentException if the collection is null 040 */ 041 public AbstractListIteratorDecorator(final ListIterator<E> iterator) { 042 super(); 043 if (iterator == null) { 044 throw new IllegalArgumentException("ListIterator must not be null"); 045 } 046 this.iterator = iterator; 047 } 048 049 /** 050 * Gets the iterator being decorated. 051 * 052 * @return the decorated iterator 053 */ 054 protected ListIterator<E> getListIterator() { 055 return iterator; 056 } 057 058 //----------------------------------------------------------------------- 059 060 /** {@inheritDoc} */ 061 public boolean hasNext() { 062 return iterator.hasNext(); 063 } 064 065 /** {@inheritDoc} */ 066 public E next() { 067 return iterator.next(); 068 } 069 070 /** {@inheritDoc} */ 071 public int nextIndex() { 072 return iterator.nextIndex(); 073 } 074 075 /** {@inheritDoc} */ 076 public boolean hasPrevious() { 077 return iterator.hasPrevious(); 078 } 079 080 /** {@inheritDoc} */ 081 public E previous() { 082 return iterator.previous(); 083 } 084 085 /** {@inheritDoc} */ 086 public int previousIndex() { 087 return iterator.previousIndex(); 088 } 089 090 /** {@inheritDoc} */ 091 public void remove() { 092 iterator.remove(); 093 } 094 095 /** {@inheritDoc} */ 096 public void set(final E obj) { 097 iterator.set(obj); 098 } 099 100 /** {@inheritDoc} */ 101 public void add(final E obj) { 102 iterator.add(obj); 103 } 104 105}