What are Steps to create new filter factory ?

[prerna07 <pk...@sapient.com>]

Hi,

I want to create a txt file named as lemmatisation.txt and want to use it
through filter factory. This flow will work similar to synonym filter
factory

please provide information on below mentioned points;

1) What are the steps to create a new filter factory which is similar to
synonym filter factory.

2) What are the drawbacks / best practices of creating new filter factory.

3) Do we need to change lucene code for the same.

Thanks,
Prerna


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Re: What are Steps to create new filter factory ?

[Grant Ingersoll <gs...@apache.org>]

On Jul 27, 2009, at 7:06 AM, prerna07 wrote:

>
> Hi,
>
> I want to create a txt file named as lemmatisation.txt and want to  
> use it
> through filter factory. This flow will work similar to synonym filter
> factory
>
> please provide information on below mentioned points;
>
> 1) What are the steps to create a new filter factory which is  
> similar to
> synonym filter factory.

I usually just build them by looking at some other one that is similar  
to the one you are building.  Essentially, you need to capture/ 
configure any settings you need and then create the TokenStream.  See  
also http://wiki.apache.org/solr/SolrPlugins#head-718653697f60b44092280c8c506077e0933e3668

>
> 2) What are the drawbacks / best practices of creating new filter  
> factory.

It's usually pretty straightforward.  I would guess the only one is to  
recognize that creating TokenStreams can happen a lot, so try to do  
any work you can in the init phase.

>
> 3) Do we need to change lucene code for the same.

Not likely.  Sounds like you have your own TokenFilter, right?

--------------------------
Grant Ingersoll
http://www.lucidimagination.com/

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