org.apache.lucene.analysis.icu
Class ICUFoldingFilter

java.lang.Object
  extended by org.apache.lucene.util.AttributeSource
      extended by org.apache.lucene.analysis.TokenStream
          extended by org.apache.lucene.analysis.TokenFilter
              extended by org.apache.lucene.analysis.icu.ICUNormalizer2Filter
                  extended by org.apache.lucene.analysis.icu.ICUFoldingFilter
All Implemented Interfaces:
Closeable

public final class ICUFoldingFilter
extends ICUNormalizer2Filter

A TokenFilter that applies search term folding to Unicode text, applying foldings from UTR#30 Character Foldings.

This filter applies the following foldings from the report to unicode text:

Additionally, Default Ignorables are removed, and text is normalized to NFKC. All foldings, case folding, and normalization mappings are applied recursively to ensure a fully folded and normalized result.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.AttributeFactory, AttributeSource.State
 
Field Summary
 
Fields inherited from class org.apache.lucene.analysis.TokenFilter
input
 
Constructor Summary
ICUFoldingFilter(TokenStream input)
          Create a new ICUFoldingFilter on the specified input
 
Method Summary
 
Methods inherited from class org.apache.lucene.analysis.icu.ICUNormalizer2Filter
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, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState, toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ICUFoldingFilter

public ICUFoldingFilter(TokenStream input)
Create a new ICUFoldingFilter on the specified input



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