GermanStemFilter (Lucene 2.9.4 API)

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java.lang.Object
- org.apache.lucene.util.AttributeSource
- - org.apache.lucene.analysis.TokenStream
  - - org.apache.lucene.analysis.TokenFilter
    - - org.apache.lucene.analysis.de.GermanStemFilter

```
public final class GermanStemFilter
extends org.apache.lucene.analysis.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).

Version:

$Id: GermanStemFilter.java 805400 2009-08-18 12:55:26Z rmuir $

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
  org.apache.lucene.util.AttributeSource.AttributeFactory, org.apache.lucene.util.AttributeSource.State

Field Summary
- Fields inherited from class org.apache.lucene.analysis.TokenFilter
  input

Constructor Summary

Constructors
Constructor and Description
`GermanStemFilter(org.apache.lucene.analysis.TokenStream in)`
`GermanStemFilter(org.apache.lucene.analysis.TokenStream in, java.util.Set exclusionSet)` Builds a GermanStemFilter that uses an exclusion table.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`incrementToken()`
`void`	`setExclusionSet(java.util.Set exclusionSet)` Set an alternative exclusion list for this filter.
`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.analysis.TokenStream
getOnlyUseNewAPI, next, next, setOnlyUseNewAPI

Methods inherited from class org.apache.lucene.util.AttributeSource
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, restoreState, toString

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - GermanStemFilter
```
public GermanStemFilter(org.apache.lucene.analysis.TokenStream in)
```
  - GermanStemFilter
```
public GermanStemFilter(org.apache.lucene.analysis.TokenStream in,
                        java.util.Set exclusionSet)
```
    Builds a GermanStemFilter that uses an exclusion table.
- Method Detail
  - incrementToken
```
public boolean incrementToken()
                       throws java.io.IOException
```
    Overrides:
    
    incrementToken in class org.apache.lucene.analysis.TokenStream
    
    Returns:
    
    Returns true for next token in the stream, or false at EOS
    
    Throws:
    
    java.io.IOException
  - setStemmer
```
public void setStemmer(GermanStemmer stemmer)
```
    Set a alternative/custom GermanStemmer for this filter.
  - setExclusionSet
```
public void setExclusionSet(java.util.Set exclusionSet)
```
    Set an alternative exclusion list for this filter.

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