org.apache.lucene.analysis.de
Class GermanStemFilter

java.lang.Object
  extended by org.apache.lucene.util.AttributeSource
      extended by org.apache.lucene.analysis.TokenStream
          extended by org.apache.lucene.analysis.TokenFilter
              extended by org.apache.lucene.analysis.de.GermanStemFilter
All Implemented Interfaces:
Closeable

public final class GermanStemFilter
extends TokenFilter

A TokenFilter that stems German 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 GermanStemmer).

To prevent terms from being stemmed use an instance of KeywordMarkerFilter or a custom TokenFilter that sets the KeywordAttribute before this TokenStream.

See Also:
KeywordMarkerFilter

Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.AttributeFactory, AttributeSource.State
 
Field Summary
 
Fields inherited from class org.apache.lucene.analysis.TokenFilter
input
 
Constructor Summary
GermanStemFilter(TokenStream in)
          Creates a GermanStemFilter instance
 
Method Summary
 boolean incrementToken()
           
 void setStemmer(GermanStemmer stemmer)
          Set a alternative/custom GermanStemmer for this filter.
 
Methods inherited from class org.apache.lucene.analysis.TokenFilter
close, end, reset
 
Methods inherited from class org.apache.lucene.util.AttributeSource
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

GermanStemFilter

public GermanStemFilter(TokenStream in)
Creates a GermanStemFilter instance

Parameters:
in - the source TokenStream
Method Detail

incrementToken

public boolean incrementToken()
                       throws IOException
Specified by:
incrementToken in class TokenStream
Returns:
Returns true for next token in the stream, or false at EOS
Throws:
IOException

setStemmer

public void setStemmer(GermanStemmer stemmer)
Set a alternative/custom GermanStemmer for this filter.



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