Package opennlp.tools.util.featuregen

Class PrefixFeatureGenerator

java.lang.Object

opennlp.tools.util.featuregen.PrefixFeatureGenerator

All Implemented Interfaces:

AdaptiveFeatureGenerator

public class PrefixFeatureGenerator
extends Object
implements AdaptiveFeatureGenerator

A feature generator implementation that generates prefix-based features.

See Also:

• AdaptiveFeatureGenerator

Constructor Summary

Constructors

Constructor	Description
PrefixFeatureGenerator()	Intializes a default PrefixFeatureGenerator.
PrefixFeatureGenerator(int prefixLength)	Intializes a PrefixFeatureGenerator with the specified prefixLength.

Method Summary

Modifier and Type	Method	Description
void	createFeatures(List<String> features, String[] tokens, int index, String[] previousOutcomes)	Adds the appropriate features for the token at the specified index with the specified array of previousOutcomes to the specified list of features.

Methods inherited from class java.lang.Object

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

Methods inherited from interface opennlp.tools.util.featuregen.AdaptiveFeatureGenerator

clearAdaptiveData, updateAdaptiveData

Constructor Details

PrefixFeatureGenerator

public PrefixFeatureGenerator()

Intializes a default PrefixFeatureGenerator. The prefixLength length is set to the value of DEFAULT_MAX_LENGTH.

PrefixFeatureGenerator

public PrefixFeatureGenerator(int prefixLength)

Intializes a PrefixFeatureGenerator with the specified prefixLength.

Parameters:

prefixLength - The upper boundary prefix length to use.

Method Details

createFeatures

public void createFeatures(List<String> features,
 String[] tokens,
 int index,
 String[] previousOutcomes)

Description copied from interface: AdaptiveFeatureGenerator

Adds the appropriate features for the token at the specified index with the specified array of previousOutcomes to the specified list of features.

Specified by:

createFeatures in interface AdaptiveFeatureGenerator

Parameters:

features - The list of features to be added to.

tokens - The tokens of the sentence or other text unit being processed.

index - The index of the token which is currently being processed.

previousOutcomes - The outcomes for the tokens prior to the specified index.