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 * https://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 this.iterator = ObjectUtil.checkNotNull(iterator, "iterator");
26 }
27
28 @Override
29 public boolean hasNext() {
30 return iterator.hasNext();
31 }
32
33 @Override
34 public T next() {
35 return iterator.next();
36 }
37
38 @Override
39 public void remove() {
40 throw new UnsupportedOperationException("read-only");
41 }
42 }