001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.fs; 019 020import java.io.IOException; 021import java.util.NoSuchElementException; 022/** 023 * An iterator over a collection whose elements need to be fetched remotely 024 */ 025public interface RemoteIterator<E> { 026 /** 027 * Returns <tt>true</tt> if the iteration has more elements. 028 * 029 * @return <tt>true</tt> if the iterator has more elements. 030 * @throws IOException if any IO error occurs 031 */ 032 boolean hasNext() throws IOException; 033 034 /** 035 * Returns the next element in the iteration. 036 * 037 * @return the next element in the iteration. 038 * @throws NoSuchElementException iteration has no more elements. 039 * @throws IOException if any IO error occurs 040 */ 041 E next() throws IOException; 042}