001/*
002 * Copyright (C) 2010 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect;
018
019import com.google.common.annotations.GwtCompatible;
020import com.google.errorprone.annotations.DoNotCall;
021import java.util.ListIterator;
022
023/**
024 * A list iterator that does not support {@link #remove}, {@link #add}, or {@link #set}.
025 *
026 * @since 7.0
027 * @author Louis Wasserman
028 */
029@GwtCompatible
030public abstract class UnmodifiableListIterator<E> extends UnmodifiableIterator<E>
031    implements ListIterator<E> {
032  /** Constructor for use by subclasses. */
033  protected UnmodifiableListIterator() {}
034
035  /**
036   * Guaranteed to throw an exception and leave the underlying data unmodified.
037   *
038   * @throws UnsupportedOperationException always
039   * @deprecated Unsupported operation.
040   */
041  @Deprecated
042  @Override
043  @DoNotCall("Always throws UnsupportedOperationException")
044  public final void add(E e) {
045    throw new UnsupportedOperationException();
046  }
047
048  /**
049   * Guaranteed to throw an exception and leave the underlying data unmodified.
050   *
051   * @throws UnsupportedOperationException always
052   * @deprecated Unsupported operation.
053   */
054  @Deprecated
055  @Override
056  @DoNotCall("Always throws UnsupportedOperationException")
057  public final void set(E e) {
058    throw new UnsupportedOperationException();
059  }
060}