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IntNullReverseTextEdgeInputFormat xref
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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  }