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TextDoubleDoubleAdjacencyListVertexInputFormat 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  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  }