Class SnowballFilter

A filter that stems words using a Snowball-generated stemmer.

Available stemmers are listed in Lucene.Net.Tartarus.Snowball.Ext.

NOTE: SnowballFilter expects lowercased text.

• For the Turkish language, see TurkishLowerCaseFilter.
• For other languages, see LowerCaseFilter.

Note: This filter is aware of the Lucene.Net.Analysis.TokenAttributes.IKeywordAttribute. To prevent certain terms from being passed to the stemmer Lucene.Net.Analysis.TokenAttributes.IKeywordAttribute.IsKeyword should be set to true in a previous Lucene.Net.Analysis.TokenStream.

Note: For including the original term as well as the stemmed version, see KeywordRepeatFilterFactory

Inheritance

object

AttributeSource

TokenStream

TokenFilter

SnowballFilter

Implements

IDisposable

Inherited Members

TokenFilter.End()

TokenFilter.Reset()

TokenStream.Dispose()

AttributeSource.GetAttributeFactory()

AttributeSource.GetAttributeClassesEnumerator()

AttributeSource.GetAttributeImplsEnumerator()

AttributeSource.AddAttributeImpl(Attribute)

AttributeSource.AddAttribute<T>()

AttributeSource.HasAttributes

AttributeSource.HasAttribute<T>()

AttributeSource.GetAttribute<T>()

AttributeSource.ClearAttributes()

AttributeSource.CaptureState()

AttributeSource.RestoreState(AttributeSource.State)

AttributeSource.GetHashCode()

AttributeSource.Equals(object)

AttributeSource.ReflectAsString(bool)

AttributeSource.ReflectWith(IAttributeReflector)

AttributeSource.CloneAttributes()

AttributeSource.CopyTo(AttributeSource)

AttributeSource.ToString()

object.Equals(object, object)

object.GetType()

object.ReferenceEquals(object, object)

Namespace: Lucene.Net.Analysis.Snowball

Assembly: Lucene.Net.Analysis.Common.dll

Syntax

public sealed class SnowballFilter : TokenFilter, IDisposable

Constructors

SnowballFilter(TokenStream, SnowballProgram)

A filter that stems words using a Snowball-generated stemmer.

Available stemmers are listed in Lucene.Net.Tartarus.Snowball.Ext.

NOTE: SnowballFilter expects lowercased text.

• For the Turkish language, see TurkishLowerCaseFilter.
• For other languages, see LowerCaseFilter.

Note: This filter is aware of the Lucene.Net.Analysis.TokenAttributes.IKeywordAttribute. To prevent certain terms from being passed to the stemmer Lucene.Net.Analysis.TokenAttributes.IKeywordAttribute.IsKeyword should be set to true in a previous Lucene.Net.Analysis.TokenStream.

Note: For including the original term as well as the stemmed version, see KeywordRepeatFilterFactory

Declaration

public SnowballFilter(TokenStream input, SnowballProgram stemmer)

Parameters

Type	Name	Description
TokenStream	input
SnowballProgram	stemmer

SnowballFilter(TokenStream, string)

Construct the named stemming filter.

Available stemmers are listed in Lucene.Net.Tartarus.Snowball.Ext. The name of a stemmer is the part of the class name before "Stemmer", e.g., the stemmer in EnglishStemmer is named "English".

Declaration

public SnowballFilter(TokenStream @in, string name)

Parameters

Type	Name	Description
TokenStream	in	the input tokens to stem
string	name	the name of a stemmer

Methods

IncrementToken()

Returns the next input Lucene.Net.Analysis.Token, after being stemmed

Declaration

public override sealed bool IncrementToken()

Returns

Type	Description
bool

Overrides

Lucene.Net.Analysis.TokenStream.IncrementToken()

Implements

IDisposable