org.terrier.terms

Class SnowballStemmer

java.lang.Object

org.terrier.terms.StemmerTermPipeline

org.terrier.terms.SnowballStemmer

All Implemented Interfaces:

Stemmer, TermPipeline

Direct Known Subclasses:

DanishSnowballStemmer, DutchSnowballStemmer, EnglishSnowballStemmer, FinnishSnowballStemmer, FrenchSnowballStemmer, GermanSnowballStemmer, HungarianSnowballStemmer, ItalianSnowballStemmer, NorwegianSnowballStemmer, PortugueseSnowballStemmer, RomanianSnowballStemmer, RussianSnowballStemmer, SpanishSnowballStemmer, SwedishSnowballStemmer, TurkishSnowballStemmer

public abstract class SnowballStemmer
extends StemmerTermPipeline

Classic Snowball stemmer implmented by Snowball.

Author:

Craig Macdonald

Field Summary

Fields

Modifier and Type	Field and Description
protected static Object[]	emptyArgs
protected String	language The language that we're currently stemming in
protected org.tartarus.snowball.SnowballProgram	stemmer The actual Snowball object that does the stemming
protected Method	stemMethod The appropriate method.

Fields inherited from class org.terrier.terms.StemmerTermPipeline

next

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SnowballStemmer(String StemLanguage, TermPipeline next) Creates a new stemmer object for the language StemLanguage.

Method Summary

Methods

Modifier and Type	Method and Description
String	stem(String term) Stems the given term and returns the stem

Methods inherited from class org.terrier.terms.StemmerTermPipeline

processTerm, reset

Methods inherited from class java.lang.Object

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

Field Detail

stemmer

protected org.tartarus.snowball.SnowballProgram stemmer

The actual Snowball object that does the stemming

stemMethod

protected Method stemMethod

The appropriate method. Damn reflection APIs.

language

protected String language

The language that we're currently stemming in

emptyArgs

protected static final Object[] emptyArgs

Constructor Detail

SnowballStemmer

protected SnowballStemmer(String StemLanguage,
               TermPipeline next)

Creates a new stemmer object for the language StemLanguage.

Parameters:

StemLanguage - Name of the language to generate the stemmer for. Must be a valid Snowball stemmer language.

next - The next object in the term pipeline

Method Detail

stem

public String stem(String term)

Stems the given term and returns the stem

Parameters:

term - the term to be stemmed.

Returns:

the stemmed form of term