Class EdgeNGramTokenizer

Tokenizes the input from an edge into n-grams of given size(s).

This Tokenizer create n-grams from the beginning edge or ending edge of a input token.

As of Lucene 4.4, this tokenizer

  • can handle 
    maxGram
    larger than 1024 chars, but beware that this will result in increased memory usage
  • doesn't trim the input,
  • sets position increments equal to 1 instead of 1 for the first token and 0 for all other ones
  • doesn't support backward n-grams anymore.
  • supports IsTokenChar(Int32) pre-tokenization,
  • correctly handles supplementary characters.

Although highly discouraged, it is still possible to use the old behavior through Lucene43EdgeNGramTokenizer.

Inheritance
System.Object
AttributeSource
TokenStream
Tokenizer
NGramTokenizer
EdgeNGramTokenizer
Inherited Members
Lucene.Net.Analysis.Tokenizer.SetReader(System.IO.TextReader)
System.Object.Equals(System.Object, System.Object)
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.GetType()
System.Object.MemberwiseClone()
Assembly: Lucene.Net.Analysis.Common.dll
Syntax
[Serializable]
public class EdgeNGramTokenizer : NGramTokenizer, IDisposable

Constructors

Name Description
EdgeNGramTokenizer(LuceneVersion, AttributeSource.AttributeFactory, TextReader, Int32, Int32)

Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range
EdgeNGramTokenizer(LuceneVersion, TextReader, Int32, Int32)

Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range

Fields

Name Description
DEFAULT_MAX_GRAM_SIZE
DEFAULT_MIN_GRAM_SIZE

Extension Methods