SnowballFilter (Lucene 7.7.0 API)

java.lang.Object
- org.apache.lucene.util.AttributeSource
- - org.apache.lucene.analysis.TokenStream
  - - org.apache.lucene.analysis.TokenFilter
    - - org.apache.lucene.analysis.snowball.SnowballFilter

All Implemented Interfaces:

Closeable, AutoCloseable
```
public final class SnowballFilter
extends TokenFilter
```
A filter that stems words using a Snowball-generated stemmer. Available stemmers are listed in org.tartarus.snowball.ext.
NOTE: SnowballFilter expects lowercased text.
- For the Turkish language, see TurkishLowerCaseFilter.
- For other languages, see LowerCaseFilter.
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
`SnowballFilter(TokenStream in, String name)`	Construct the named stemming filter.
`SnowballFilter(TokenStream input, SnowballProgram stemmer)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

boolean incrementToken()
Returns the next input Token, after being stemmed
- 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
  - SnowballFilter
```
public SnowballFilter(TokenStream input,
                      SnowballProgram stemmer)
```
  - SnowballFilter
```
public SnowballFilter(TokenStream in,
                      String name)
```
    Construct the named stemming filter. Available stemmers are listed in org.tartarus.snowball.ext. The name of a stemmer is the part of the class name before "Stemmer", e.g., the stemmer in EnglishStemmer is named "English".
    
    Parameters:
    
    in - the input tokens to stem
    
    name - the name of a stemmer
- Method Detail
  - incrementToken
```
public final boolean incrementToken()
                             throws IOException
```
    Returns the next input Token, after being stemmed
    
    Specified by:
    
    incrementToken in class TokenStream
    
    Throws:
    
    IOException