Class ICUFoldingFilter

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

Inheritance

System.Object

Lucene.Net.Util.AttributeSource

Lucene.Net.Analysis.TokenStream

Lucene.Net.Analysis.TokenFilter

ICUNormalizer2Filter

ICUFoldingFilter

Implements

System.IDisposable

Inherited Members

ICUNormalizer2Filter.IncrementToken()

Lucene.Net.Analysis.TokenFilter.m_input

Lucene.Net.Analysis.TokenFilter.End()

TokenFilter.Dispose(Boolean)

Lucene.Net.Analysis.TokenFilter.Reset()

Lucene.Net.Analysis.TokenStream.Dispose()

Lucene.Net.Util.AttributeSource.GetAttributeFactory()

Lucene.Net.Util.AttributeSource.GetAttributeClassesEnumerator()

Lucene.Net.Util.AttributeSource.GetAttributeImplsEnumerator()

Lucene.Net.Util.AttributeSource.AddAttributeImpl(Lucene.Net.Util.Attribute)

Lucene.Net.Util.AttributeSource.AddAttribute<T>()

Lucene.Net.Util.AttributeSource.HasAttributes

Lucene.Net.Util.AttributeSource.HasAttribute<T>()

Lucene.Net.Util.AttributeSource.GetAttribute<T>()

Lucene.Net.Util.AttributeSource.ClearAttributes()

Lucene.Net.Util.AttributeSource.CaptureState()

Lucene.Net.Util.AttributeSource.RestoreState(Lucene.Net.Util.AttributeSource.State)

Lucene.Net.Util.AttributeSource.GetHashCode()

AttributeSource.Equals(Object)

AttributeSource.ReflectAsString(Boolean)

Lucene.Net.Util.AttributeSource.ReflectWith(Lucene.Net.Util.IAttributeReflector)

Lucene.Net.Util.AttributeSource.CloneAttributes()

Lucene.Net.Util.AttributeSource.CopyTo(Lucene.Net.Util.AttributeSource)

Lucene.Net.Util.AttributeSource.ToString()

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 ICUFoldingFilter : ICUNormalizer2Filter, IDisposable

Remarks

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

Accent removal
Case folding
Canonical duplicates folding
Dashes folding
Diacritic removal (including stroke, hook, descender)
Greek letterforms folding
Han Radical folding
Hebrew Alternates folding
Jamo folding
Letterforms folding
Math symbol folding
Multigraph Expansions: All
Native digit folding
No-break folding
Overline folding
Positional forms folding
Small forms folding
Space folding
Spacing Accents folding
Subscript folding
Superscript folding
Suzhou Numeral folding
Symbol folding
Underline folding
Vertical forms folding
Width folding

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.

Constructors

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ICUFoldingFilter(TokenStream)

Create a new ICUFoldingFilter on the specified input

Declaration

public ICUFoldingFilter(TokenStream input)

Parameters

Type	Name	Description
Lucene.Net.Analysis.TokenStream	input

Implements

System.IDisposable