org.apache.lucene.analysis.de
Class GermanStemFilter
java.lang.Object
org.apache.lucene.util.AttributeSource
org.apache.lucene.analysis.TokenStream
org.apache.lucene.analysis.TokenFilter
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
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 |
GermanStemFilter
public GermanStemFilter(TokenStream in)
- Creates a
GermanStemFilter
instance
- Parameters:
in
- the source TokenStream
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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