org.apache.lucene.analysis.nl
Class DutchStemFilter

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

public final class DutchStemFilter
extends org.apache.lucene.analysis.TokenFilter

A TokenFilter 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).

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

org.apache.lucene.util.AttributeSource.AttributeFactory, org.apache.lucene.util.AttributeSource.State

Field Summary

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

input

Constructor Summary

DutchStemFilter(org.apache.lucene.analysis.TokenStream _in)

DutchStemFilter(org.apache.lucene.analysis.TokenStream _in, Set exclusiontable)
Builds a DutchStemFilter that uses an exclusion table.

DutchStemFilter(org.apache.lucene.analysis.TokenStream _in, Set exclusiontable, Map stemdictionary)

Method Summary

boolean	incrementToken() 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, end, reset

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

getOnlyUseNewAPI, next, next, setOnlyUseNewAPI

Methods inherited from class org.apache.lucene.util.AttributeSource

addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, restoreState, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DutchStemFilter

public DutchStemFilter(org.apache.lucene.analysis.TokenStream _in)

DutchStemFilter

public DutchStemFilter(org.apache.lucene.analysis.TokenStream _in,
                       Set exclusiontable)

Builds a DutchStemFilter that uses an exclusion table.

DutchStemFilter

public DutchStemFilter(org.apache.lucene.analysis.TokenStream _in,
                       Set exclusiontable,
                       Map stemdictionary)

Parameters:

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

Method Detail

incrementToken

public boolean incrementToken()
                       throws IOException

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

Overrides:

incrementToken in class org.apache.lucene.analysis.TokenStream

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.