001    /*
002     * Copyright (C) 2007 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    
017    package com.google.common.collect;
018    
019    import com.google.common.annotations.GwtCompatible;
020    
021    import java.util.ListIterator;
022    
023    /**
024     * A list iterator which forwards all its method calls to another list
025     * iterator. Subclasses should override one or more methods to modify the
026     * behavior of the backing iterator as desired per the <a
027     * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
028     *
029     * @author Mike Bostock
030     * @since 2.0 (imported from Google Collections Library)
031     */
032    @GwtCompatible
033    public abstract class ForwardingListIterator<E> extends ForwardingIterator<E>
034        implements ListIterator<E> {
035    
036      /** Constructor for use by subclasses. */
037      protected ForwardingListIterator() {}
038    
039      
040      @Override
041      protected abstract ListIterator<E> delegate();
042    
043      public void add(E element) {
044        delegate().add(element);
045      }
046    
047      public boolean hasPrevious() {
048        return delegate().hasPrevious();
049      }
050    
051      public int nextIndex() {
052        return delegate().nextIndex();
053      }
054    
055      public E previous() {
056        return delegate().previous();
057      }
058    
059      public int previousIndex() {
060        return delegate().previousIndex();
061      }
062    
063      public void set(E element) {
064        delegate().set(element);
065      }
066    }