| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.giraph.io.formats; |
| |
| import org.apache.giraph.io.EdgeReader; |
| import org.apache.giraph.utils.IntPair; |
| import org.apache.hadoop.io.IntWritable; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| import java.io.IOException; |
| import java.util.regex.Pattern; |
| |
| /** |
| * Simple text-based {@link org.apache.giraph.io.EdgeInputFormat} for |
| * unweighted graphs with int ids. |
| * |
| * Each line consists of: source_vertex, target_vertex |
| */ |
| public class IntNullTextEdgeInputFormat extends |
| TextEdgeInputFormat<IntWritable, NullWritable> { |
| /** Splitter for endpoints */ |
| private static final Pattern SEPARATOR = Pattern.compile("[\t ]"); |
| |
| @Override |
| public EdgeReader<IntWritable, NullWritable> createEdgeReader( |
| InputSplit split, TaskAttemptContext context) throws IOException { |
| return new IntNullTextEdgeReader(); |
| } |
| |
| /** |
| * {@link org.apache.giraph.io.EdgeReader} associated with |
| * {@link IntNullTextEdgeInputFormat}. |
| */ |
| public class IntNullTextEdgeReader extends |
| TextEdgeReaderFromEachLineProcessed<IntPair> { |
| @Override |
| protected IntPair preprocessLine(Text line) throws IOException { |
| String[] tokens = SEPARATOR.split(line.toString()); |
| return new IntPair(Integer.parseInt(tokens[0]), |
| Integer.parseInt(tokens[1])); |
| } |
| |
| @Override |
| protected IntWritable getSourceVertexId(IntPair endpoints) |
| throws IOException { |
| return new IntWritable(endpoints.getFirst()); |
| } |
| |
| @Override |
| protected IntWritable getTargetVertexId(IntPair endpoints) |
| throws IOException { |
| return new IntWritable(endpoints.getSecond()); |
| } |
| |
| @Override |
| protected NullWritable getValue(IntPair endpoints) throws IOException { |
| return NullWritable.get(); |
| } |
| } |
| } |