1/*
2 * Copyright (C) 2007 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect;
18
19import com.google.common.annotations.GwtCompatible;
20
21import java.util.Iterator;
22
23/**
24 * An iterator which forwards all its method calls to another iterator.
25 * Subclasses should override one or more methods to modify the behavior of the
26 * backing iterator as desired per the <a
27 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
28 *
29 * @author Kevin Bourrillion
30 * @since 2.0 (imported from Google Collections Library)
31 */
32@GwtCompatible
33public abstract class ForwardingIterator<T>
34    extends ForwardingObject implements Iterator<T> {
35
36  /** Constructor for use by subclasses. */
37  protected ForwardingIterator() {}
38
39  @Override protected abstract Iterator<T> delegate();
40
41  @Override
42  public boolean hasNext() {
43    return delegate().hasNext();
44  }
45
46  @Override
47  public T next() {
48    return delegate().next();
49  }
50
51  @Override
52  public void remove() {
53    delegate().remove();
54  }
55}
56