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From Otis Gospodnetic <>
Subject Re: Analyzers for various languages
Date Sat, 14 Dec 2002 16:16:49 GMT
Hello Eric,

Thanks for volunteering.  I agree with your suggestions in the last
paragraph of your email.  I think a suitable place for the
language-specific code would be Lucene Sandbox, at least for now.
I think a single project dir for all of them would suffice, organized
like this:


Underneath the code could be in:

which is just like it is in the core Lucene now.
(Maybe something with 'lang' in it would be better, not sure...?)

If you want I can create the structure and you can post your code to
lucene-dev for review before committing it in the CVS.

As far as building these, and making them easily available to users of
core Lucene, I think it would be nice to have a build file that can
build each language separately and put it in a small well named Jar
(e.g. lucene-lang-de.jar)  of its own, or build all languages into a
single Jar (e.g. lucene-lang.jar).

I am not sure about the best way to let Lucene users access these Jars,
other than (manually?) including them in the release directory whenever
Lucene is released.
But we don't need to know this right now, getting started with the code
is more important. 

Also, this would require that existing language-specific code (de, ru,
default English) eventually be moved out of Lucene core into this
language pack.  This should probably include English, too, if other
code doesn't have dependencies on it, and compiles without it.

I wonder what other developers' thoughts are...


--- Eric Isakson <> wrote:
> Hi All, 
> I want to volunteer to help get language modules organized into the
> CVS and builds.
> I've been lurking on the lists here for a couple months and working
> with and getting familiar with Lucene. I'm investigating the use of
> lucene to support our help system's fulltext search requirements. I
> have to build indices for multiple languages. I just poked around the
> CVS archives and found only the German, Russian and standard(English)
> analyzers in the core and nothing in the sandbox. In the list
> archives I've found many references to folks using Lucene for several
> other languages. I did find the CJKTokenizer, Dutch and French
> analyzers and have put those into my tests. Is there somewhere these
> analyzers are organized that I might get a hold of the sources for
> other languages to build into my toolset? There were a couple
> mentioned that several of you appear to be using that I can't find
> the sources for (most notably
> <>  which
> gives a "Cannot find server" error). 
> In order to meet the requirements for my product these are the
> languages I have to support: 
> Must Support 
> ------------ 
> English
> Japanese 
> Chinese 
> Korean 
> French 
> German 
> Italian 
> Polish 
> Not Sure Yet 
> ------------ 
> Czech 
> Danish 
> Hebrew 
> Hungarian 
> Russian 
> Spanish 
> Swedish 
> I understand the issues that were raised about putting language
> modules in the core and then not being able to support them, but it
> seems they have not been put anywhere. I would be willing to try and
> get them into a central place that people can access them or help
> someone that is already working on that. I can't commit today to
> being able to maintain or bugfix contributions, but should my company
> adopt Lucene as our search engine (which seems likely at this point)
> I'll do what I can to contribute back any fixes we make. I also have
> a personal interest in the project since I've found Lucene quite
> interesting to be working with and I've enjoyed learning about
> internationalizing java apps.
> I'll volunteer to help gather and organize these somewhere if I were
> given committer rights to the appropriate area and folks would be
> willing to send me their language modules. 
> I recall some discussion about moving language modules out of the
> core, but I don't think any decisions were made about where to put
> them (perhaps this is why they aren't in the CVS at all). I was
> thinking perhaps give each language a sandbox project or create
> language packages in the core build that could be enabled via
> settings in the file. Using the
> file could allow us to create a jar for each language during the core
> build so folks could install just the language modules they want and
> if a language module starts breaking due to changes in the core it
> could easily be turned off until fixes were made to that module. I
> can start working on a setup like this in my local source tree next
> week using the existing language modules in the core if you all think
> this would be a good approach. If not, does anyone have a proposal
> for where these belong so we can get some movement on getting them
> committed to CVS?
> Regards,
> Eric
> -- 
> Eric D. Isakson        SAS Institute Inc. 
> Application Developer  SAS Campus Drive 
> XML Technologies       Cary, NC 27513 
> (919) 531-3639 <>  

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