edu.stanford.nlp.ie
Class AbstractFieldExtractor

java.lang.Object
  |
  +--edu.stanford.nlp.ie.AbstractFieldExtractor

All Implemented Interfaces:

FieldExtractor, RankedExtractor, Serializable

Direct Known Subclasses:

RegexpsFieldExtractor, SingleFieldExtractor

public abstract class AbstractFieldExtractor

extends Object

implements FieldExtractor, Serializable, RankedExtractor

Abstract superclass for implementations of the FieldExtractor interface. Provides basic functionality for write serialization. Shallowly implements RankedExtractor, in that no confidence rankings are actually specified. Added 6/4/02: Support for merging compatible instances through the implementation of RankedExtractor.

See Also:

Serialized Form

Constructor Summary

AbstractFieldExtractor()

Method Summary

edu.unika.aifb.kaon.Instance	extractFields(edu.unika.aifb.kaon.Instance i, String text, Confidence c) The one method for compliance with the RankedExtractor interface.
boolean	isFieldExtractable(edu.unika.aifb.kaon.Concept c, edu.unika.aifb.kaon.Relation r) Default implementation, that simply looks through the results of getExtractableFields(Concept) to see if the given Relation is extractable.
void	storeExtractor(File out) Serializes this FieldExtractor to the given output file.
String	toString() Returns the value of getDescription() as the String representation of this Object.

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.stanford.nlp.ie.FieldExtractor

extractFields, getDescription, getExtractableFields

Constructor Detail

AbstractFieldExtractor

public AbstractFieldExtractor()

Method Detail

isFieldExtractable

public boolean isFieldExtractable(edu.unika.aifb.kaon.Concept c,
                                  edu.unika.aifb.kaon.Relation r)

Default implementation, that simply looks through the results of getExtractableFields(Concept) to see if the given Relation is extractable. Subclasses that support a large number of Relations may wish to override this for performance reasons.

Specified by:

isFieldExtractable in interface FieldExtractor

storeExtractor

public void storeExtractor(File out)
                    throws IOException

Serializes this FieldExtractor to the given output file. Throws an IOException if there is a problem with serialization (e.g. if it can't get write permission to the given File.

Specified by:

storeExtractor in interface FieldExtractor

IOException

toString

public String toString()

Returns the value of getDescription() as the String representation of this Object.

Overrides:

toString in class Object

extractFields

public edu.unika.aifb.kaon.Instance extractFields(edu.unika.aifb.kaon.Instance i,
                                                  String text,
                                                  Confidence c)

The one method for compliance with the RankedExtractor interface. It ignores the Confidence object; thus, subclasses should override this method if more functionality is required.

Specified by:

extractFields in interface RankedExtractor

Parameters:

i - the original Instance to extract into

text - the text from which to extract

c - the Confidence object corresponding to the Instance passed in, which stores numerical confidence ratings for the extracted fields

Returns:

the updated Instance