Package org.apache.lucene.analysis.en
Class KStemFilter
- java.lang.Object
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- org.apache.lucene.util.AttributeSource
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- org.apache.lucene.analysis.TokenStream
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- org.apache.lucene.analysis.TokenFilter
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- org.apache.lucene.analysis.en.KStemFilter
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
public final class KStemFilter extends TokenFilter
A high-performance kstem filter for english. See "Viewing Morphology as an Inference Process" (Krovetz, R., Proceedings of the Sixteenth Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, 191-203, 1993). All terms must already be lowercased for this filter to work correctly.Note: This filter is aware of the
KeywordAttribute
. To prevent certain terms from being passed to the stemmerKeywordAttribute.isKeyword()
should be set totrue
in a previousTokenStream
. Note: For including the original term as well as the stemmed version, seeKeywordRepeatFilterFactory
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.AttributeFactory, AttributeSource.State
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Constructor Summary
Constructors Constructor Description KStemFilter(TokenStream in)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
incrementToken()
Returns the next, stemmed, input Token.-
Methods inherited from class org.apache.lucene.analysis.TokenFilter
close, end, reset
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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, toString
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Constructor Detail
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KStemFilter
public KStemFilter(TokenStream in)
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Method Detail
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incrementToken
public boolean incrementToken() throws java.io.IOException
Returns the next, stemmed, input Token.- Specified by:
incrementToken
in classTokenStream
- Returns:
- The stemmed form of a token.
- Throws:
java.io.IOException
- If there is a low-level I/O error.
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