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

Author:

Craig Macdonald

Field Summary

protected static java.lang.Object[]	emptyArgs
protected java.lang.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 java.lang.reflect.Method	stemMethod The appropriate method.

Fields inherited from class org.terrier.terms.StemmerTermPipeline

next

Constructor Summary

protected

SnowballStemmer(java.lang.String StemLanguage, TermPipeline next) Creates a new stemmer object for the language StemLanguage.

Method Summary

java.lang.String

stem(java.lang.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 java.lang.reflect.Method stemMethod

The appropriate method. Damn reflection APIs.

language

protected java.lang.String language

The language that we're currently stemming in

emptyArgs

protected static final java.lang.Object[] emptyArgs

Constructor Detail

SnowballStemmer

protected SnowballStemmer(java.lang.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 java.lang.String stem(java.lang.String term)

Stems the given term and returns the stem

Parameters:

term - the term to be stemmed.

Returns:

the stemmed form of term