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19 package org.apache.giraph.io.internal;
20
21 import org.apache.giraph.io.VertexInputFormat;
22 import org.apache.giraph.io.VertexReader;
23 import org.apache.giraph.job.HadoopUtils;
24 import org.apache.hadoop.conf.Configuration;
25 import org.apache.hadoop.io.Writable;
26 import org.apache.hadoop.io.WritableComparable;
27 import org.apache.hadoop.mapreduce.InputSplit;
28 import org.apache.hadoop.mapreduce.JobContext;
29 import org.apache.hadoop.mapreduce.TaskAttemptContext;
30
31 import java.io.DataInput;
32 import java.io.DataOutput;
33 import java.io.IOException;
34 import java.util.List;
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48 public class WrappedVertexInputFormat<I extends WritableComparable,
49 V extends Writable, E extends Writable>
50 extends VertexInputFormat<I, V, E> {
51
52 private VertexInputFormat<I, V, E> originalInputFormat;
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58
59 public WrappedVertexInputFormat(
60 VertexInputFormat<I, V, E> vertexInputFormat) {
61 originalInputFormat = vertexInputFormat;
62 }
63
64 @Override
65 public void checkInputSpecs(Configuration conf) {
66 originalInputFormat.checkInputSpecs(getConf());
67 }
68
69 @Override
70 public List<InputSplit> getSplits(JobContext context,
71 int minSplitCountHint) throws IOException, InterruptedException {
72 return originalInputFormat.getSplits(
73 HadoopUtils.makeJobContext(getConf(), context),
74 minSplitCountHint);
75 }
76
77 @Override
78 public VertexReader<I, V, E> createVertexReader(InputSplit split,
79 TaskAttemptContext context) throws IOException {
80 final VertexReader<I, V, E> vertexReader =
81 originalInputFormat.createVertexReader(split,
82 HadoopUtils.makeTaskAttemptContext(getConf(), context));
83 return new WrappedVertexReader<I, V, E>(vertexReader, getConf());
84 }
85
86 @Override
87 public void writeInputSplit(InputSplit inputSplit,
88 DataOutput dataOutput) throws IOException {
89 originalInputFormat.writeInputSplit(inputSplit, dataOutput);
90 }
91
92 @Override
93 public InputSplit readInputSplit(
94 DataInput dataInput) throws IOException, ClassNotFoundException {
95 return originalInputFormat.readInputSplit(dataInput);
96 }
97 }