org.apache.lucene.analysis
Class LetterTokenizer

java.lang.Object
  org.apache.lucene.analysis.TokenStream
      org.apache.lucene.analysis.Tokenizer
          org.apache.lucene.analysis.CharTokenizer
              org.apache.lucene.analysis.LetterTokenizer

Direct Known Subclasses:

LowerCaseTokenizer

public class LetterTokenizer
extends CharTokenizer

A LetterTokenizer is a tokenizer that divides text at non-letters. That's to say, it defines tokens as maximal strings of adjacent letters, as defined by java.lang.Character.isLetter() predicate. Note: this does a decent job for most European languages, but does a terrible job for some Asian languages, where words are not separated by spaces.

Field Summary

Fields inherited from class org.apache.lucene.analysis.Tokenizer

input

Constructor Summary

LetterTokenizer(Reader in)
Construct a new LetterTokenizer.

Method Summary

protected boolean

isTokenChar(char c) Collects only characters which satisfy Character.isLetter(char).

Methods inherited from class org.apache.lucene.analysis.CharTokenizer

next, normalize, reset

Methods inherited from class org.apache.lucene.analysis.Tokenizer

close

Methods inherited from class org.apache.lucene.analysis.TokenStream

next, reset

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LetterTokenizer

public LetterTokenizer(Reader in)

Construct a new LetterTokenizer.

Method Detail

isTokenChar

protected boolean isTokenChar(char c)

Collects only characters which satisfy Character.isLetter(char).

Specified by:

isTokenChar in class CharTokenizer