1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.utils; 20 21 import java.util.Iterator; 22 import org.apache.hadoop.io.Writable; 23 24 /** 25 * The objects provided by the iterators generated from this object have 26 * lifetimes only until next() is called. In that sense, the object 27 * provided is only a representative object. 28 * 29 * @param <T> Type that extends Writable that will be iterated 30 */ 31 public abstract class RepresentativeByteStructIterable<T extends Writable> 32 extends ByteStructIterable<T> { 33 /** 34 * Constructor 35 * 36 * @param dataInputFactory Factory for data inputs 37 */ 38 public RepresentativeByteStructIterable( 39 Factory<? extends ExtendedDataInput> dataInputFactory) { 40 super(dataInputFactory); 41 } 42 43 @Override 44 public Iterator<T> iterator() { 45 return new RepresentativeByteStructIterator<T>(dataInputFactory.create()) { 46 @Override 47 protected T createWritable() { 48 return RepresentativeByteStructIterable.this.createWritable(); 49 } 50 }; 51 } 52 }