org.apache.jena.hadoop.rdf.io.input.readers

Class TriplesToQuadsReader

java.lang.Object

org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,QuadWritable>

org.apache.jena.hadoop.rdf.io.input.readers.TriplesToQuadsReader

All Implemented Interfaces:

Closeable, AutoCloseable

public class TriplesToQuadsReader
extends org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,QuadWritable>

A record reader that converts triples into quads by wrapping a RecordReader<LongWritable, TripleWritable> implementation

Constructor Summary

Constructors

Constructor and Description
TriplesToQuadsReader(org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,TripleWritable> reader) Creates a new reader
TriplesToQuadsReader(org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,TripleWritable> reader, org.apache.jena.graph.Node graphNode) Creates a new reader

Method Summary

Modifier and Type	Method and Description
void	close()
org.apache.hadoop.io.LongWritable	getCurrentKey()
QuadWritable	getCurrentValue()
float	getProgress()
void	initialize(org.apache.hadoop.mapreduce.InputSplit split, org.apache.hadoop.mapreduce.TaskAttemptContext context)
boolean	nextKeyValue()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TriplesToQuadsReader

public TriplesToQuadsReader(org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,TripleWritable> reader)

Creates a new reader

Parameters:

reader - Triple reader

TriplesToQuadsReader

public TriplesToQuadsReader(org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,TripleWritable> reader,
                            org.apache.jena.graph.Node graphNode)

Creates a new reader

Parameters:

reader - Triple reader

graphNode - Graph node

Method Detail

initialize

public void initialize(org.apache.hadoop.mapreduce.InputSplit split,
                       org.apache.hadoop.mapreduce.TaskAttemptContext context)
                throws IOException,
                       InterruptedException

Specified by:

initialize in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,QuadWritable>

Throws:

IOException

InterruptedException

nextKeyValue

public final boolean nextKeyValue()
                           throws IOException,
                                  InterruptedException

Specified by:

nextKeyValue in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,QuadWritable>

Throws:

IOException

InterruptedException

getCurrentKey

public final org.apache.hadoop.io.LongWritable getCurrentKey()
                                                      throws IOException,
                                                             InterruptedException

Specified by:

getCurrentKey in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,QuadWritable>

Throws:

IOException

InterruptedException

getCurrentValue

public final QuadWritable getCurrentValue()
                                   throws IOException,
                                          InterruptedException

Specified by:

getCurrentValue in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,QuadWritable>

Throws:

IOException

InterruptedException

getProgress

public final float getProgress()
                        throws IOException,
                               InterruptedException

Specified by:

getProgress in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,QuadWritable>

Throws:

IOException

InterruptedException

close

public final void close()
                 throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,QuadWritable>

Throws:

IOException