eu.stratosphere.example.java.record.shortestpaths

Class PairwiseSP.RDFTripleInFormat

java.lang.Object

eu.stratosphere.api.common.io.FileInputFormat<OT>

eu.stratosphere.api.common.io.DelimitedInputFormat<Record>

eu.stratosphere.api.java.record.io.DelimitedInputFormat

eu.stratosphere.example.java.record.shortestpaths.PairwiseSP.RDFTripleInFormat

All Implemented Interfaces:

InputFormat<Record,FileInputSplit>, Serializable

Enclosing class:

PairwiseSP

public static class PairwiseSP.RDFTripleInFormat
extends DelimitedInputFormat

Reads RDF triples and filters on the foaf:knows RDF predicate. The triples elements must be separated by whitespaces. The foaf:knows RDF predicate indicates that the RDF subject knows the object (typically of type foaf:person). The connections between people are extracted and handles as graph edges. For the Pairwise Shortest Path algorithm the connection is interpreted as a directed edge, i.e. subject knows object, but the object does not necessarily know the subject. The RDFTripleInFormat filters all RDF triples with foaf:knows predicates. For each triple with foaf:knows predicate, a record is emitted with - from-node being the RDF subject at field position 0, - to-node being the RDF object at field position 1, - length being 1 at field position 2, and - hopList being an empty string at field position 3.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class eu.stratosphere.api.common.io.DelimitedInputFormat

DelimitedInputFormat.AbstractConfigBuilder<T>, DelimitedInputFormat.ConfigBuilder

Nested classes/interfaces inherited from class eu.stratosphere.api.common.io.FileInputFormat

FileInputFormat.FileBaseStatistics, FileInputFormat.InputSplitOpenThread

Field Summary

Fields inherited from class eu.stratosphere.api.common.io.DelimitedInputFormat

RECORD_DELIMITER

Fields inherited from class eu.stratosphere.api.common.io.FileInputFormat

filePath, minSplitSize, numSplits, openTimeout, splitLength, splitStart, stream

Constructor Summary

Constructors

Constructor and Description
PairwiseSP.RDFTripleInFormat()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	readRecord(Record target, byte[] bytes, int offset, int numBytes)

Methods inherited from class eu.stratosphere.api.common.io.DelimitedInputFormat

close, configure, configureDelimitedFormat, getBufferSize, getDelimiter, getLineLengthLimit, getNumLineSamples, getStatistics, loadGloablConfigParams, nextRecord, open, reachedEnd, setBufferSize, setDelimiter, setDelimiter, setDelimiter, setDelimiter, setDelimiter, setLineLengthLimit, setNumLineSamples

Methods inherited from class eu.stratosphere.api.common.io.FileInputFormat

configureFileFormat, createInputSplits, getFilePath, getFileStats, getInputSplitType, getMinSplitSize, getNumSplits, getOpenTimeout, getSplitLength, getSplitStart, setFilePath, setFilePath, setMinSplitSize, setNumSplits, setOpenTimeout, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PairwiseSP.RDFTripleInFormat

public PairwiseSP.RDFTripleInFormat()

Method Detail

readRecord

public boolean readRecord(Record target,
                 byte[] bytes,
                 int offset,
                 int numBytes)

Specified by:

readRecord in class DelimitedInputFormat