1 /*
2 * Copyright 2013 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. 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, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16
17 package io.netty.util.internal;
18
19 import java.util.Iterator;
20
21 public final class ReadOnlyIterator<T> implements Iterator<T> {
22 private final Iterator<? extends T> iterator;
23
24 public ReadOnlyIterator(Iterator<? extends T> iterator) {
25 if (iterator == null) {
26 throw new NullPointerException("iterator");
27 }
28 this.iterator = iterator;
29 }
30
31 @Override
32 public boolean hasNext() {
33 return iterator.hasNext();
34 }
35
36 @Override
37 public T next() {
38 return iterator.next();
39 }
40
41 @Override
42 public void remove() {
43 throw new UnsupportedOperationException("read-only");
44 }
45 }