org.apache.lucene.analysis.nl
Class DutchStemFilter

java.lang.Object
  org.apache.lucene.analysis.TokenStream
      org.apache.lucene.analysis.TokenFilter
          org.apache.lucene.analysis.nl.DutchStemFilter

public final class DutchStemFilter
extends TokenFilter

A filter that stems Dutch words. It supports a table of words that should not be stemmed at all. The stemmer used can be changed at runtime after the filter object is created (as long as it is a DutchStemmer).

Author:

Edwin de Jonge

Field Summary

Fields inherited from class org.apache.lucene.analysis.TokenFilter

input

Constructor Summary

DutchStemFilter(TokenStream _in)

DutchStemFilter(TokenStream _in, Set exclusiontable)
Builds a DutchStemFilter that uses an exclusiontable.

DutchStemFilter(TokenStream _in, Set exclusiontable, Map stemdictionary)

Method Summary

Token	next() Returns the next token in the stream, or null at EOS.
void	setExclusionTable(HashSet exclusiontable) Set an alternative exclusion list for this filter.
void	setStemDictionary(HashMap dict) Set dictionary for stemming, this dictionary overrules the algorithm, so you can correct for a particular unwanted word-stem pair.
void	setStemmer(DutchStemmer stemmer) Set a alternative/custom DutchStemmer for this filter.

Methods inherited from class org.apache.lucene.analysis.TokenFilter

close

Methods inherited from class org.apache.lucene.analysis.TokenStream

next, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

DutchStemFilter

public DutchStemFilter(TokenStream _in)

DutchStemFilter

public DutchStemFilter(TokenStream _in,
                       Set exclusiontable)

Builds a DutchStemFilter that uses an exclusiontable.

DutchStemFilter

public DutchStemFilter(TokenStream _in,
                       Set exclusiontable,
                       Map stemdictionary)

Parameters:

stemdictionary - Dictionary of word stem pairs, that overrule the algorithm

Method Detail

next

public Token next()
           throws IOException

Description copied from class: TokenStream

Returns the next token in the stream, or null at EOS. The returned Token is a "full private copy" (not re-used across calls to next()) but will be slower than calling TokenStream.next(Token) instead..

Overrides:

next in class TokenStream

Returns:

Returns the next token in the stream, or null at EOS

Throws:

IOException

setStemmer

public void setStemmer(DutchStemmer stemmer)

Set a alternative/custom DutchStemmer for this filter.

setExclusionTable

public void setExclusionTable(HashSet exclusiontable)

Set an alternative exclusion list for this filter.

setStemDictionary

public void setStemDictionary(HashMap dict)

Set dictionary for stemming, this dictionary overrules the algorithm, so you can correct for a particular unwanted word-stem pair.