1090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2007 The Guava Authors 3090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 4090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Licensed under the Apache License, Version 2.0 (the "License"); 5090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * you may not use this file except in compliance with the License. 6090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * You may obtain a copy of the License at 7090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 8090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 9090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 10090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Unless required by applicable law or agreed to in writing, software 11090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 12090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * See the License for the specific language governing permissions and 14090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * limitations under the License. 15090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 16090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 17090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonpackage com.google.common.collect; 18090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 19090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonimport com.google.common.annotations.GwtCompatible; 20090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 21090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonimport java.util.Iterator; 22090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 23090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/** 24090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * An iterator which forwards all its method calls to another iterator. 25090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Subclasses should override one or more methods to modify the behavior of the 26090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * backing iterator as desired per the <a 27090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>. 28090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 29090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * @author Kevin Bourrillion 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 2.0 (imported from Google Collections Library) 31090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 32090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson@GwtCompatible 33090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonpublic abstract class ForwardingIterator<T> 34090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson extends ForwardingObject implements Iterator<T> { 35090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** Constructor for use by subclasses. */ 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert protected ForwardingIterator() {} 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 39090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson @Override protected abstract Iterator<T> delegate(); 40090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 42090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson public boolean hasNext() { 43090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson return delegate().hasNext(); 44090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson } 45090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 47090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson public T next() { 48090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson return delegate().next(); 49090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson } 50090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 52090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson public void remove() { 53090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson delegate().remove(); 54090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson } 55090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson} 56