1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.collections.iterators;
18
19 import java.util.ListIterator;
20
21 /**
22 * Provides basic behaviour for decorating a list iterator with extra functionality.
23 * <p>
24 * All methods are forwarded to the decorated list iterator.
25 *
26 * @since 3.0
27 * @version $Id: AbstractListIteratorDecorator.java 1429905 2013-01-07 17:15:14Z ggregory $
28 */
29 public class AbstractListIteratorDecorator<E> implements ListIterator<E> {
30
31 /** The iterator being decorated */
32 protected final ListIterator<E> iterator;
33
34 //-----------------------------------------------------------------------
35 /**
36 * Constructor that decorates the specified iterator.
37 *
38 * @param iterator the iterator to decorate, must not be null
39 * @throws IllegalArgumentException if the collection is null
40 */
41 public AbstractListIteratorDecorator(final ListIterator<E> iterator) {
42 super();
43 if (iterator == null) {
44 throw new IllegalArgumentException("ListIterator must not be null");
45 }
46 this.iterator = iterator;
47 }
48
49 /**
50 * Gets the iterator being decorated.
51 *
52 * @return the decorated iterator
53 */
54 protected ListIterator<E> getListIterator() {
55 return iterator;
56 }
57
58 //-----------------------------------------------------------------------
59
60 /** {@inheritDoc} */
61 public boolean hasNext() {
62 return iterator.hasNext();
63 }
64
65 /** {@inheritDoc} */
66 public E next() {
67 return iterator.next();
68 }
69
70 /** {@inheritDoc} */
71 public int nextIndex() {
72 return iterator.nextIndex();
73 }
74
75 /** {@inheritDoc} */
76 public boolean hasPrevious() {
77 return iterator.hasPrevious();
78 }
79
80 /** {@inheritDoc} */
81 public E previous() {
82 return iterator.previous();
83 }
84
85 /** {@inheritDoc} */
86 public int previousIndex() {
87 return iterator.previousIndex();
88 }
89
90 /** {@inheritDoc} */
91 public void remove() {
92 iterator.remove();
93 }
94
95 /** {@inheritDoc} */
96 public void set(final E obj) {
97 iterator.set(obj);
98 }
99
100 /** {@inheritDoc} */
101 public void add(final E obj) {
102 iterator.add(obj);
103 }
104
105 }