Class PorterStemFilter

Transforms the token stream as per the Porter stemming algorithm.

Note: the input to the stemming filter must already be in lower case, so you will need to use LowerCaseFilter or LowerCaseTokenizer farther down the Tokenizer chain in order for this to work properly!

To use this filter with other analyzers, you'll want to write an Analyzer class that sets up the TokenStream chain as you want it. To use this with LowerCaseTokenizer, for example, you'd write an analyzer like this: 

class MyAnalyzer : Analyzer {
  protected override TokenStreamComponents CreateComponents(string fieldName, TextReader reader) {
    Tokenizer source = new LowerCaseTokenizer(version, reader);
    return new TokenStreamComponents(source, new PorterStemFilter(source));
  }
}

Note: This filter is aware of the Lucene.Net.Analysis.TokenAttributes.KeywordAttribute. To prevent certain terms from being passed to the stemmer 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
System.Object
Lucene.Net.Util.AttributeSource
Lucene.Net.Analysis.TokenStream
Lucene.Net.Analysis.TokenFilter
PorterStemFilter
Implements
System.IDisposable
Inherited Members
Lucene.Net.Analysis.TokenFilter.m_input
Lucene.Net.Analysis.TokenFilter.End()
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()
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.En
Assembly: Lucene.Net.Analysis.Common.dll
Syntax
public sealed class PorterStemFilter : TokenFilter, IDisposable

Constructors

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PorterStemFilter(TokenStream)

Declaration
public PorterStemFilter(TokenStream in)
Parameters
Type Name Description
Lucene.Net.Analysis.TokenStream in

Methods

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IncrementToken()

Declaration
public override bool IncrementToken()
Returns
Type Description
System.Boolean
Overrides
Lucene.Net.Analysis.TokenStream.IncrementToken()

Implements

System.IDisposable