org.apache.lucene.analysis.ru
Class RussianLetterTokenizer

java.lang.Object
  org.apache.lucene.util.AttributeSource
      org.apache.lucene.analysis.TokenStream
          org.apache.lucene.analysis.Tokenizer
              org.apache.lucene.analysis.CharTokenizer
                  org.apache.lucene.analysis.ru.RussianLetterTokenizer

public class RussianLetterTokenizer
extends CharTokenizer

A RussianLetterTokenizer is a Tokenizer that extends LetterTokenizer by additionally looking up letters in a given "russian charset".

The problem with LetterTokenizer is that it uses Character.isLetter(char) method, which doesn't know how to detect letters in encodings like CP1252 and KOI8 (well-known problems with 0xD7 and 0xF7 chars)

Version:

$Id: RussianLetterTokenizer.java 806961 2009-08-23 12:39:28Z rmuir $

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

AttributeSource.AttributeFactory, AttributeSource.State

Field Summary

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

input

Constructor Summary

RussianLetterTokenizer(AttributeSource.AttributeFactory factory, Reader in)

RussianLetterTokenizer(AttributeSource source, Reader in)

RussianLetterTokenizer(Reader in)

RussianLetterTokenizer(Reader in, char[] charset)
Deprecated. Use RussianLetterTokenizer(Reader) instead.

Method Summary

protected boolean

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

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

end, incrementToken, next, next, normalize, reset

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

close, correctOffset

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

getOnlyUseNewAPI, reset, setOnlyUseNewAPI

Methods inherited from class org.apache.lucene.util.AttributeSource

addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, restoreState, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

RussianLetterTokenizer

public RussianLetterTokenizer(Reader in,
                              char[] charset)

Deprecated. Use RussianLetterTokenizer(Reader) instead.

RussianLetterTokenizer

public RussianLetterTokenizer(Reader in)

RussianLetterTokenizer

public RussianLetterTokenizer(AttributeSource source,
                              Reader in)

RussianLetterTokenizer

public RussianLetterTokenizer(AttributeSource.AttributeFactory factory,
                              Reader in)

Method Detail

isTokenChar

protected boolean isTokenChar(char c)

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

Specified by:

isTokenChar in class CharTokenizer