com.atlassian.jira.issue.index.analyzer
Class CJKTokenizer

java.lang.Object
  org.apache.lucene.analysis.TokenStream
      org.apache.lucene.analysis.Tokenizer
          com.atlassian.jira.issue.index.analyzer.CJKTokenizer

public final class CJKTokenizer
extends org.apache.lucene.analysis.Tokenizer

CJKTokenizer was modified from StopTokenizer which does a decent job for most European languages. It performs other token methods for double-byte Characters: the token will return at each two charactors with overlap match.
Example: "java C1C2C3C4" will be segment to: "java" "C1C2" "C2C3" "C3C4" it also need filter filter zero length token ""
for Digit: digit, '+', '#' will token as letter
for more info on Asia language(Chinese Japanese Korean) text segmentation: please search google

Author:

Che, Dong

Field Summary

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

input

Constructor Summary

CJKTokenizer(Reader in)
Construct a token stream processing the given input.

Method Summary

org.apache.lucene.analysis.Token

next() Returns the next token in the stream, or null at EOS.

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

close

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

reset

Methods inherited from class java.lang.Object

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

Constructor Detail

CJKTokenizer

public CJKTokenizer(Reader in)

Construct a token stream processing the given input.

Parameters:

in - I/O reader

Method Detail

next

public final org.apache.lucene.analysis.Token next()
                                            throws IOException

Returns the next token in the stream, or null at EOS. See http://java.sun.com/j2se/1.3/docs/api/java/lang/Character.UnicodeBlock.html for detail.

Specified by:

next in class org.apache.lucene.analysis.TokenStream

Returns:

Token

Throws:

IOException - - throw IOException when read error
hanppened in the InputStream