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VertexValueReader 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;
20  
21  import org.apache.giraph.graph.Vertex;
22  import org.apache.hadoop.io.Writable;
23  import org.apache.hadoop.io.WritableComparable;
24  import org.apache.hadoop.mapreduce.InputSplit;
25  import org.apache.hadoop.mapreduce.TaskAttemptContext;
26  
27  import java.io.IOException;
28  
29  /**
30   * Vertex reader for {@link org.apache.giraph.io.VertexValueInputFormat}.
31   *
32   * @param <I> Vertex id
33   * @param <V> Vertex value
34   */
35  public abstract class VertexValueReader<I extends WritableComparable,
36      V extends Writable> extends BasicVertexValueReader<I, V> {
37    @Override
38    public void initialize(InputSplit inputSplit, TaskAttemptContext context)
39      throws IOException, InterruptedException {
40    }
41  
42    @Override
43    public final Vertex<I, V, Writable> getCurrentVertex() throws IOException,
44        InterruptedException {
45      Vertex<I, V, Writable> vertex = getConf().createVertex();
46      vertex.initialize(getCurrentVertexId(), getCurrentVertexValue());
47      return vertex;
48    }
49  }