ScandinavianNormalizationFilter (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.miscellaneous.ScandinavianNormalizationFilter

All Implemented Interfaces:

Closeable, AutoCloseable
```
public final class ScandinavianNormalizationFilter
extends TokenFilter
```
This filter normalize use of the interchangeable Scandinavian characters æÆäÄöÖøØ and folded variants (aa, ao, ae, oe and oo) by transforming them to åÅæÆøØ.
It's a semantically less destructive solution than ScandinavianFoldingFilter, most useful when a person with a Norwegian or Danish keyboard queries a Swedish index and vice versa. This filter does not the common Swedish folds of å and ä to a nor ö to o.
blåbærsyltetøj == blåbärsyltetöj == blaabaarsyltetoej but not blabarsyltetoj räksmörgås == ræksmørgås == ræksmörgaos == raeksmoergaas but not raksmorgas
There are also separate filters for Norwegian, Danish and Swedish with slightly differing settings

See Also:

ScandinavianFoldingFilter

- 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
  
  ScandinavianNormalizationFilter(TokenStream input)
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  boolean incrementToken()
  - 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

ScandinavianNormalizationFilter

public ScandinavianNormalizationFilter(TokenStream input)

Method Detail
- incrementToken
```
public boolean incrementToken()
                       throws IOException
```
  Specified by:
  
  incrementToken in class TokenStream
  
  Throws:
  
  IOException