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

Class AbstractRdfReader<TValue,T extends AbstractNodeTupleWritable<TValue>>

java.lang.Object

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

org.apache.jena.hadoop.rdf.io.input.readers.AbstractRdfReader<TValue,T>

Type Parameters:

TValue - Tuple type

T - Writable tuple type

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

QuadsReader, TriplesOrQuadsReader, TriplesReader

public abstract class AbstractRdfReader<TValue,T extends AbstractNodeTupleWritable<TValue>>
extends org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,T>

An abstract record reader for arbitrary RDF which provides support for selecting the actual record reader to use based on detecting the RDF language from the file name

Constructor Summary

Constructors

Constructor and Description
AbstractRdfReader()

Method Summary

Modifier and Type	Method and Description
void	close()
org.apache.hadoop.io.LongWritable	getCurrentKey()
T	getCurrentValue()
float	getProgress()
void	initialize(org.apache.hadoop.mapreduce.InputSplit genericSplit, 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

AbstractRdfReader

public AbstractRdfReader()

Method Detail

initialize

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

Specified by:

initialize in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,T extends AbstractNodeTupleWritable<TValue>>

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,T extends AbstractNodeTupleWritable<TValue>>

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,T extends AbstractNodeTupleWritable<TValue>>

Throws:

IOException

InterruptedException

getCurrentValue

public final T getCurrentValue()
                        throws IOException,
                               InterruptedException

Specified by:

getCurrentValue in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,T extends AbstractNodeTupleWritable<TValue>>

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,T extends AbstractNodeTupleWritable<TValue>>

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,T extends AbstractNodeTupleWritable<TValue>>

Throws:

IOException