edu.washington.cs.knowitall.extractor
Class RelationFirstNpChunkExtractor

java.lang.Object
  edu.washington.cs.knowitall.extractor.Extractor<ChunkedSentence,ChunkedBinaryExtraction>
      edu.washington.cs.knowitall.extractor.RelationFirstNpChunkExtractor

Direct Known Subclasses:

ReVerbRelationExtractor

public abstract class RelationFirstNpChunkExtractor
extends Extractor<ChunkedSentence,ChunkedBinaryExtraction>

Extracts ChunkedBinaryExtraction objects by first extracting relations, and then for each relation, extracting a pair of arguments. A RelationFirstNpChunkExtractor must have:

• A relation extractor of type Extractor<NpChunkedSentence, NpChunkedExtraction>
• An argument1 extractor of type Extractor<NpChunkedExtraction, NpChunkArgumentExtraction>
• An argument2 extractor of type Extractor<NpChunkedExtraction, NpChunkArgumentExtraction>

Subclasses extending RelationFirstNpChunkExtractor are responsible for setting the extractors via the setRelationExtractor(Extractor), setArgument1Extractor(Extractor), and setArgument2Extractor(Extractor) methods.

Author:

afader

Field Summary

protected boolean	allowUnary
protected Extractor<ChunkedExtraction,ChunkedArgumentExtraction>	arg1Extr
protected Extractor<ChunkedExtraction,ChunkedArgumentExtraction>	arg2Extr
protected Extractor<ChunkedSentence,ChunkedExtraction>	relExtr

Constructor Summary

RelationFirstNpChunkExtractor()

Method Summary

protected Collection<ChunkedBinaryExtraction>	extractCandidates(ChunkedSentence source) Extracts candidate extractions from the given source object.
Extractor<ChunkedExtraction,ChunkedArgumentExtraction>	getArgument1Extractor()
Extractor<ChunkedExtraction,ChunkedArgumentExtraction>	getArgument2Extractor()
Extractor<ChunkedSentence,ChunkedExtraction>	getRelationExtractor()
void	setAllowUnary(boolean allowUnary)
void	setArgument1Extractor(Extractor<ChunkedExtraction,ChunkedArgumentExtraction> arg1Extr) Sets the argument1 extractor.
void	setArgument2Extractor(Extractor<ChunkedExtraction,ChunkedArgumentExtraction> arg2Extr) Sets the argument2 extractor.
void	setRelationExtractor(Extractor<ChunkedSentence,ChunkedExtraction> relExtr) Sets the relation extractor.

Methods inherited from class edu.washington.cs.knowitall.extractor.Extractor

addMapper, compose, extract, getMappers

Methods inherited from class java.lang.Object

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

Field Detail

allowUnary

protected boolean allowUnary

relExtr

protected Extractor<ChunkedSentence,ChunkedExtraction> relExtr

arg1Extr

protected Extractor<ChunkedExtraction,ChunkedArgumentExtraction> arg1Extr

arg2Extr

protected Extractor<ChunkedExtraction,ChunkedArgumentExtraction> arg2Extr

Constructor Detail

RelationFirstNpChunkExtractor

public RelationFirstNpChunkExtractor()

Method Detail

getRelationExtractor

public Extractor<ChunkedSentence,ChunkedExtraction> getRelationExtractor()

Returns:

the extractor used to extract relations.

getArgument1Extractor

public Extractor<ChunkedExtraction,ChunkedArgumentExtraction> getArgument1Extractor()

Returns:

the extractor used to extract argument1.

getArgument2Extractor

public Extractor<ChunkedExtraction,ChunkedArgumentExtraction> getArgument2Extractor()

Returns:

the extractor used to extract argument2.

setRelationExtractor

public void setRelationExtractor(Extractor<ChunkedSentence,ChunkedExtraction> relExtr)

Sets the relation extractor.

Parameters:

relExtr -

setArgument1Extractor

public void setArgument1Extractor(Extractor<ChunkedExtraction,ChunkedArgumentExtraction> arg1Extr)

Sets the argument1 extractor.

Parameters:

arg1Extr -

setArgument2Extractor

public void setArgument2Extractor(Extractor<ChunkedExtraction,ChunkedArgumentExtraction> arg2Extr)

Sets the argument2 extractor.

Parameters:

arg2Extr -

setAllowUnary

public void setAllowUnary(boolean allowUnary)

extractCandidates

protected Collection<ChunkedBinaryExtraction> extractCandidates(ChunkedSentence source)
                                                         throws ExtractorException

Description copied from class: Extractor

Extracts candidate extractions from the given source object. When the user calls Extractor.extract(Object), the this method is used to generate a set of candidate extractions, which are then passed through each mapper object attached to the extractor.

Specified by:

extractCandidates in class Extractor<ChunkedSentence,ChunkedBinaryExtraction>

Parameters:

source - the source to extract from.

Returns:

an iterable object over the candidate extractions.

Throws:

ExtractorException - if unable to extract