RE: CJK support in lucene

[Eric Isakson <Er...@sas.com>]

This archived message has the CJKTokenizer code attached (there are some links in the code to material that describes the tokenization strategy).

http://nagoya.apache.org/eyebrowse/ReadMsg?listName=lucene-dev@jakarta.apache.org&msgId=330905

You have to write your own analyzer that uses this tokenizer. See http://www.onjava.com/pub/a/onjava/2003/01/15/lucene.html for some details on how to write an analyzer.

here is one you could use:
package my.package;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.StopFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.cjk.CJKTokenizer;
import java.io.Reader;

public class CJKAnalyzer extends Analyzer {
    
    public CJKAnalyzer() {
    }
    
    /**
     * Creates a TokenStream which tokenizes all the text in the provided Reader.
     *
     * @return  A TokenStream built from a CJKTokenizer
     */
    public TokenStream tokenStream( String fieldName, Reader reader )
    {
        TokenStream result = new CJKTokenizer( reader );
		result = new StopFilter(result, new String[] {""}); // CJKTokenizer emitts a "" sometimes, haven't been able to figure it out, so this is a workaround
        return result;
    }
}

Lastly, you have to package those things up and use them along with the core lucene code.

CC'ing this to Lucene User so everyone can benefit from these answers. Maybe a faq on indexing CJK languages would be a good thing to add. The existing one (http://lucene.sourceforge.net/cgi-bin/faq/faqmanager.cgi?file=chapter.indexing&toc=faq#q28) is somewhat light on details (so is this answer, but it is a bit more direct about dealing with CJK) and http://www.jguru.com/faq/view.jsp?EID=1011118 is useful to be aware of too.

Good luck,
Eric

-----Original Message-----
From: Avnish Midha [mailto:Avnish.Midha@telelogic.com] 
Sent: Wednesday, July 16, 2003 1:06 PM
To: Eric Isakson
Subject: CJK support in lucene



Hi Eric,

I read the description of the bug (#18933) reported by you on the apache site. I had a question related to this defect. In the description you have mentioned that CJK support should be included in the core build. Is there any other way we can enable the CJK support in the lucene search engine? Would be grateful to you if you could let me know of any such method of enabling CJK support in the serach engine.

Eagerly waiting for your reply.

Thanks & Regards,
Avnish Midha
Phone no.: +1-949-8852540





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