1 /* 2 * Copyright (C) 2007 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 which forwards all its method calls to another iterator. 25 * Subclasses should override one or more methods to modify the behavior of the 26 * backing iterator as desired per the <a 27 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>. 28 * 29 * @author Kevin Bourrillion 30 * @since 2.0 (imported from Google Collections Library) 31 */ 32 @GwtCompatible 33 public abstract class ForwardingIterator<T> 34 extends ForwardingObject implements Iterator<T> { 35 36 /** Constructor for use by subclasses. */ 37 protected ForwardingIterator() {} 38 39 @Override protected abstract Iterator<T> delegate(); 40 41 @Override 42 public boolean hasNext() { 43 return delegate().hasNext(); 44 } 45 46 @Override 47 public T next() { 48 return delegate().next(); 49 } 50 51 @Override 52 public void remove() { 53 delegate().remove(); 54 } 55 } 56
