DutchStemFilter (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.nl.DutchStemFilter

```
public final class DutchStemFilter
extends org.apache.lucene.analysis.TokenFilter
```
A TokenFilter that stems Dutch 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 DutchStemmer).
NOTE: This stemmer does not implement the Snowball algorithm correctly, specifically doubled consonants. It is recommended that you consider using the "Dutch" stemmer in the snowball package instead. This stemmer will likely be deprecated in a future release.

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
`DutchStemFilter(org.apache.lucene.analysis.TokenStream _in)`
`DutchStemFilter(org.apache.lucene.analysis.TokenStream _in, java.util.Set exclusiontable)` Builds a DutchStemFilter that uses an exclusion table.
`DutchStemFilter(org.apache.lucene.analysis.TokenStream _in, java.util.Set exclusiontable, java.util.Map stemdictionary)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`incrementToken()` Returns the next token in the stream, or null at EOS
`void`	`setExclusionTable(java.util.HashSet exclusiontable)` Set an alternative exclusion list for this filter.
`void`	`setStemDictionary(java.util.HashMap dict)` Set dictionary for stemming, this dictionary overrules the algorithm, so you can correct for a particular unwanted word-stem pair.
`void`	`setStemmer(DutchStemmer stemmer)` Set a alternative/custom `DutchStemmer` 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
  - DutchStemFilter
```
public DutchStemFilter(org.apache.lucene.analysis.TokenStream _in)
```
  - DutchStemFilter
```
public DutchStemFilter(org.apache.lucene.analysis.TokenStream _in,
                       java.util.Set exclusiontable)
```
    Builds a DutchStemFilter that uses an exclusion table.
  - DutchStemFilter
```
public DutchStemFilter(org.apache.lucene.analysis.TokenStream _in,
                       java.util.Set exclusiontable,
                       java.util.Map stemdictionary)
```
    Parameters:
    
    stemdictionary - Dictionary of word stem pairs, that overrule the algorithm
- Method Detail
  - incrementToken
```
public boolean incrementToken()
                       throws java.io.IOException
```
    Returns the next token in the stream, or null at EOS
    
    Overrides:
    
    incrementToken in class org.apache.lucene.analysis.TokenStream
    
    Throws:
    
    java.io.IOException
  - setStemmer
```
public void setStemmer(DutchStemmer stemmer)
```
    Set a alternative/custom DutchStemmer for this filter.
  - setExclusionTable
```
public void setExclusionTable(java.util.HashSet exclusiontable)
```
    Set an alternative exclusion list for this filter.
  - setStemDictionary
```
public void setStemDictionary(java.util.HashMap dict)
```
    Set dictionary for stemming, this dictionary overrules the algorithm, so you can correct for a particular unwanted word-stem pair.

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