KStemFilter (Lucene 8.6.0 API)

java.lang.Object
- org.apache.lucene.util.AttributeSource
- - org.apache.lucene.analysis.TokenStream
  - - org.apache.lucene.analysis.TokenFilter
    - - org.apache.lucene.analysis.en.KStemFilter

All Implemented Interfaces:

Closeable, 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 stemmer KeywordAttribute.isKeyword() should be set to true in a previous TokenStream. Note: For including the original term as well as the stemmed version, see KeywordRepeatFilterFactory

- Nested Class Summary
  - Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
    AttributeSource.State
- Field Summary
  - Fields inherited from class org.apache.lucene.analysis.TokenFilter
    input
  - Fields inherited from class org.apache.lucene.analysis.TokenStream
    DEFAULT_TOKEN_ATTRIBUTE_FACTORY
- Constructor Summary
  
  Constructors
  Constructor Description
  
  KStemFilter(TokenStream in)
- 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
  - Methods inherited from class org.apache.lucene.util.AttributeSource
    addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, endAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, removeAllAttributes, restoreState, toString
  - Methods inherited from class java.lang.Object
    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - KStemFilter
```
public KStemFilter(TokenStream in)
```
- Method Detail
  - incrementToken
```
public boolean incrementToken()
                       throws IOException
```
    Returns the next, stemmed, input Token.
    
    Specified by:
    
    incrementToken in class TokenStream
    
    Returns:
    
    The stemmed form of a token.
    
    Throws:
    
    IOException - If there is a low-level I/O error.