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SimpleTextVertexOutputFormat 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
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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
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17   */
18  
19  package org.apache.giraph.examples;
20  
21  import org.apache.giraph.graph.Vertex;
22  import org.apache.giraph.io.formats.TextVertexOutputFormat;
23  import org.apache.hadoop.io.FloatWritable;
24  import org.apache.hadoop.io.IntWritable;
25  import org.apache.hadoop.io.LongWritable;
26  import org.apache.hadoop.io.Text;
27  import org.apache.hadoop.mapreduce.TaskAttemptContext;
28  
29  import java.io.IOException;
30  
31  /**
32   * Simple text based vertex output format example.
33   */
34  public class SimpleTextVertexOutputFormat extends
35      TextVertexOutputFormat<LongWritable, IntWritable, FloatWritable> {
36    /**
37     * Simple text based vertex writer
38     */
39    private class SimpleTextVertexWriter extends TextVertexWriter {
40      @Override
41      public void writeVertex(
42        Vertex<LongWritable, IntWritable, FloatWritable> vertex)
43        throws IOException, InterruptedException {
44        getRecordWriter().write(
45            new Text(vertex.getId().toString()),
46            new Text(vertex.getValue().toString()));
47      }
48    }
49  
50    @Override
51    public TextVertexWriter createVertexWriter(TaskAttemptContext context)
52      throws IOException, InterruptedException {
53      return new SimpleTextVertexWriter();
54    }
55  }