Class ICUTransformFilter

A TokenFilter that transforms text with ICU.

Inheritance
System.Object
AttributeSource
TokenStream
TokenFilter
ICUTransformFilter
Implements
System.IDisposable
Inherited Members
System.Object.Equals(System.Object, System.Object)
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Lucene.Net.Analysis.Icu
Assembly: Lucene.Net.ICU.dll
Syntax
public sealed class ICUTransformFilter : TokenFilter, IDisposable
Remarks

ICU provides text-transformation functionality via its Transliteration API. Although script conversion is its most common use, a Transliterator can actually perform a more general class of tasks. In fact, Transliterator defines a very general API which specifies only that a segment of the input text is replaced by new text. The particulars of this conversion are determined entirely by subclasses of Transliterator.

Some useful transformations for search are built-in:

  • Conversion from Traditional to Simplified Chinese characters
  • Conversion from Hiragana to Katakana
  • Conversion from Fullwidth to Halfwidth forms.
  • Script conversions, for example Serbian Cyrillic to Latin

Example usage: 

    stream = new ICUTransformFilter(stream, Transliterator.GetInstance("Traditional-Simplified"));

For more details, see the ICU User Guide.

Constructors

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ICUTransformFilter(TokenStream, Transliterator)

Create a new ICUTransformFilter that transforms text on the given stream.

Declaration
public ICUTransformFilter(TokenStream input, Transliterator transform)
Parameters
Type Name Description
TokenStream input

TokenStream to filter.
ICU4N.Text.Transliterator transform

Transliterator to transform the text.

Methods

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IncrementToken()

Declaration
public override bool IncrementToken()
Returns
Type Description
System.Boolean
Overrides

Implements

System.IDisposable