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 package org.apache.giraph.io.formats; 19 20 import org.apache.giraph.edge.Edge; 21 import org.apache.giraph.edge.EdgeFactory; 22 import org.apache.hadoop.io.DoubleWritable; 23 import org.apache.hadoop.io.Text; 24 import org.apache.hadoop.mapreduce.InputSplit; 25 import org.apache.hadoop.mapreduce.TaskAttemptContext; 26 27 /** 28 * Class to read graphs stored as adjacency lists with ids represented by 29 * Strings and values as doubles. This is a good inputformat for reading 30 * graphs where the id types do not matter and can be stashed in a String. 31 */ 32 public class TextDoubleDoubleAdjacencyListVertexInputFormat 33 extends AdjacencyListTextVertexInputFormat<Text, DoubleWritable, 34 DoubleWritable> { 35 36 @Override 37 public AdjacencyListTextVertexReader createVertexReader(InputSplit split, 38 TaskAttemptContext context) { 39 return new TextDoubleDoubleAdjacencyListVertexReader(null); 40 } 41 42 /** 43 * Vertex reader used with 44 * {@link TextDoubleDoubleAdjacencyListVertexInputFormat} 45 */ 46 protected class TextDoubleDoubleAdjacencyListVertexReader extends 47 AdjacencyListTextVertexReader { 48 49 /** 50 * Constructor with 51 * {@link AdjacencyListTextVertexInputFormat.LineSanitizer}. 52 * 53 * @param lineSanitizer the sanitizer to use for reading 54 */ 55 public TextDoubleDoubleAdjacencyListVertexReader(LineSanitizer 56 lineSanitizer) { 57 super(lineSanitizer); 58 } 59 60 @Override 61 public Text decodeId(String s) { 62 return new Text(s); 63 } 64 65 @Override 66 public DoubleWritable decodeValue(String s) { 67 return new DoubleWritable(Double.parseDouble(s)); 68 } 69 70 @Override 71 public Edge<Text, DoubleWritable> decodeEdge(String s1, String s2) { 72 return EdgeFactory.create(new Text(s1), 73 new DoubleWritable(Double.parseDouble(s2))); 74 } 75 } 76 77 }