Class GermanStemFilter

  extended by org.apache.lucene.util.AttributeSource
      extended by org.apache.lucene.analysis.TokenStream
          extended by org.apache.lucene.analysis.TokenFilter
              extended by
All Implemented Interfaces:

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:

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
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


public GermanStemFilter(TokenStream in)
Creates a GermanStemFilter instance

in - the source TokenStream
Method Detail


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


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

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