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.io.formats; 20 21 import org.apache.giraph.io.EdgeReader; 22 import org.apache.giraph.io.ReverseEdgeDuplicator; 23 import org.apache.hadoop.io.IntWritable; 24 import org.apache.hadoop.io.NullWritable; 25 import org.apache.hadoop.mapreduce.InputSplit; 26 import org.apache.hadoop.mapreduce.TaskAttemptContext; 27 28 import java.io.IOException; 29 30 /** 31 * Simple text-based {@link org.apache.giraph.io.EdgeInputFormat} for 32 * unweighted graphs with int ids. 33 * 34 * Each line consists of: source_vertex, target_vertex 35 * 36 * This version also creates the reverse edges. 37 */ 38 public class IntNullReverseTextEdgeInputFormat 39 extends IntNullTextEdgeInputFormat { 40 @Override 41 public EdgeReader<IntWritable, NullWritable> createEdgeReader( 42 InputSplit split, TaskAttemptContext context) throws IOException { 43 EdgeReader<IntWritable, NullWritable> edgeReader = 44 super.createEdgeReader(split, context); 45 edgeReader.setConf(getConf()); 46 return new ReverseEdgeDuplicator<IntWritable, NullWritable>(edgeReader); 47 } 48 }