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
18package java.util;
19
20/**
21 * AbstractSequentialList is an abstract implementation of the List interface.
22 * This implementation does not support adding. A subclass must implement the
23 * abstract method listIterator().
24 *
25 * @since 1.2
26 */
27public abstract class AbstractSequentialList<E> extends AbstractList<E> {
28
29    /**
30     * Constructs a new instance of this AbstractSequentialList.
31     */
32    protected AbstractSequentialList() {
33    }
34
35    @Override
36    public void add(int location, E object) {
37        listIterator(location).add(object);
38    }
39
40    @Override
41    public boolean addAll(int location, Collection<? extends E> collection) {
42        ListIterator<E> it = listIterator(location);
43        Iterator<? extends E> colIt = collection.iterator();
44        int next = it.nextIndex();
45        while (colIt.hasNext()) {
46            it.add(colIt.next());
47        }
48        return next != it.nextIndex();
49    }
50
51    @Override
52    public E get(int location) {
53        try {
54            return listIterator(location).next();
55        } catch (NoSuchElementException e) {
56            throw new IndexOutOfBoundsException();
57        }
58    }
59
60    @Override
61    public Iterator<E> iterator() {
62        return listIterator(0);
63    }
64
65    @Override
66    public abstract ListIterator<E> listIterator(int location);
67
68    @Override
69    public E remove(int location) {
70        try {
71            ListIterator<E> it = listIterator(location);
72            E result = it.next();
73            it.remove();
74            return result;
75        } catch (NoSuchElementException e) {
76            throw new IndexOutOfBoundsException();
77        }
78    }
79
80    @Override
81    public E set(int location, E object) {
82        ListIterator<E> it = listIterator(location);
83        if (!it.hasNext()) {
84            throw new IndexOutOfBoundsException();
85        }
86        E result = it.next();
87        it.set(object);
88        return result;
89    }
90}
91