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package org.apache.giraph.io; |
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import java.io.IOException; |
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import org.apache.giraph.edge.Edge; |
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import org.apache.giraph.edge.EdgeFactory; |
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import org.apache.hadoop.io.Writable; |
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import org.apache.hadoop.io.WritableComparable; |
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import org.apache.hadoop.mapreduce.InputSplit; |
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import org.apache.hadoop.mapreduce.TaskAttemptContext; |
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public class ReverseEdgeDuplicator<I extends WritableComparable, |
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E extends Writable> extends EdgeReader<I, E> { |
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private final EdgeReader<I, E> baseReader; |
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43 | 0 | private boolean haveReverseEdge = true; |
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private Edge<I, E> reverseEdge; |
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private I reverseSourceId; |
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53 | 0 | public ReverseEdgeDuplicator(EdgeReader<I, E> baseReader) { |
54 | 0 | this.baseReader = baseReader; |
55 | 0 | } |
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public EdgeReader<I, E> getBaseReader() { |
62 | 0 | return baseReader; |
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} |
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@Override |
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public void initialize(InputSplit inputSplit, TaskAttemptContext context) |
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throws IOException, InterruptedException { |
68 | 0 | baseReader.initialize(inputSplit, context); |
69 | 0 | haveReverseEdge = true; |
70 | 0 | } |
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@Override |
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public boolean nextEdge() throws IOException, InterruptedException { |
74 | 0 | boolean result = true; |
75 | 0 | if (haveReverseEdge) { |
76 | 0 | result = baseReader.nextEdge(); |
77 | 0 | haveReverseEdge = false; |
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} else { |
79 | 0 | Edge<I, E> currentEdge = baseReader.getCurrentEdge(); |
80 | 0 | reverseSourceId = currentEdge.getTargetVertexId(); |
81 | 0 | reverseEdge = EdgeFactory.create(baseReader.getCurrentSourceId(), |
82 | 0 | currentEdge.getValue()); |
83 | 0 | haveReverseEdge = true; |
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} |
85 | 0 | return result; |
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} |
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@Override |
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public I getCurrentSourceId() throws IOException, InterruptedException { |
90 | 0 | if (haveReverseEdge) { |
91 | 0 | return reverseSourceId; |
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} else { |
93 | 0 | return baseReader.getCurrentSourceId(); |
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} |
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} |
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@Override |
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public Edge<I, E> getCurrentEdge() throws IOException, InterruptedException { |
99 | 0 | if (haveReverseEdge) { |
100 | 0 | return reverseEdge; |
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} else { |
102 | 0 | return baseReader.getCurrentEdge(); |
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} |
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} |
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@Override |
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public void close() throws IOException { |
108 | 0 | baseReader.close(); |
109 | 0 | } |
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@Override |
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public float getProgress() throws IOException, InterruptedException { |
113 | 0 | return baseReader.getProgress(); |
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} |
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} |