org.apache.lucene.analysis.nl
Class DutchStemFilter

java.lang.Object
  extended by org.apache.lucene.analysis.TokenStream
      extended by org.apache.lucene.analysis.TokenFilter
          extended by 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()
           
 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
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.



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