1   /*
2    * Copyright (C) 2008 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  
17  package com.google.common.collect;
18  
19  import com.google.common.annotations.GwtCompatible;
20  
21  import java.util.Iterator;
22  
23  /**
24   * An iterator that does not support {@link #remove}.
25   *
26   * @author Jared Levy
27   * @since 2.0 (imported from Google Collections Library)
28   */
29  @GwtCompatible
30  public abstract class UnmodifiableIterator<E> implements Iterator<E> {
31    /** Constructor for use by subclasses. */
32    protected UnmodifiableIterator() {}
33  
34    /**
35     * Guaranteed to throw an exception and leave the underlying data unmodified.
36     *
37     * @throws UnsupportedOperationException always
38     * @deprecated Unsupported operation.
39     */
40    @Deprecated
41    @Override
42    public final void remove() {
43      throw new UnsupportedOperationException();
44    }
45  }