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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  }