GermanStemFilter (Lucene 9.0.0 common API)

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, AutoCloseable
```
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 SetKeywordMarkerFilter or a custom TokenFilter that sets the KeywordAttribute before this TokenStream.

See Also:

SetKeywordMarkerFilter

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

GermanStemFilter(TokenStream in)
Creates a GermanStemFilter instance

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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, 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
  - GermanStemFilter
```
public GermanStemFilter(TokenStream in)
```
    Creates a GermanStemFilter instance
    
    Parameters:
    
    in - the source TokenStream
- Method Detail
  - 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.