edu.washington.cs.knowitall.extractor
Class RegexExtractor

java.lang.Object
  edu.washington.cs.knowitall.extractor.Extractor<ChunkedSentence,ChunkedExtraction>
      edu.washington.cs.knowitall.extractor.RegexExtractor

public class RegexExtractor
extends Extractor<ChunkedSentence,ChunkedExtraction>

An extractor that uses a regular expression pattern relations from NP-chunked sentences. This class uses a LayeredTokenPattern object to represent the regular expression pattern.

Author:

afader

Constructor Summary

RegexExtractor(String patternString)
Constructs a new instance using the given pattern.

Method Summary

Collection<ChunkedExtraction>	extractCandidates(ChunkedSentence sentence) Extracts candidate extractions from the given source object.
LayeredTokenPattern	getPattern()
String	getPatternString()

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

Constructor Detail

RegexExtractor

public RegexExtractor(String patternString)
               throws SequenceException

Constructs a new instance using the given pattern.

Parameters:

pattern - the relation pattern

Throws:

SequenceException - if unable to compile pattern

Method Detail

getPatternString

public String getPatternString()

Returns:

the String relation pattern.

getPattern

public LayeredTokenPattern getPattern()

Returns:

the LayeredTokenPattern used to extract relations.

extractCandidates

public Collection<ChunkedExtraction> extractCandidates(ChunkedSentence sentence)
                                                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,ChunkedExtraction>

Parameters:

sentence - the source to extract from.

Returns:

an iterable object over the candidate extractions.

Throws:

ExtractorException - if unable to extract