edu.washington.cs.knowitall.extractor
Class ExtractorComposition<R,S,T>

java.lang.Object
  edu.washington.cs.knowitall.extractor.Extractor<R,T>
      edu.washington.cs.knowitall.extractor.ExtractorComposition<R,S,T>

Type Parameters:

R -

S -

T -

public class ExtractorComposition<R,S,T>
extends Extractor<R,T>

A class used to represent the composition of two Extractor objects.

Author:

afader

Constructor Summary

ExtractorComposition(Extractor<R,S> rsExtractor, Extractor<S,T> stExtractor)
Constructs a new extractor that is the composition of the given extractors.

Method Summary

protected Collection<T>

extractCandidates(R r) Extracts candidate extractions from the given source object.

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

ExtractorComposition

public ExtractorComposition(Extractor<R,S> rsExtractor,
                            Extractor<S,T> stExtractor)

Constructs a new extractor that is the composition of the given extractors.

Parameters:

rsExtractor -

stExtractor -

Method Detail

extractCandidates

protected Collection<T> extractCandidates(R r)
                                   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<R,T>

Parameters:

r - the source to extract from.

Returns:

an iterable object over the candidate extractions.

Throws:

ExtractorException - if unable to extract