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From "Kelvin Tan" <kel...@relevanz.com>
Subject Re: Chainable Filter contribution
Date Thu, 28 Mar 2002 07:15:17 GMT
Stephan,

I honestly don't know. There's going to be a /contrib section set up soon
though, so I think it might go in there at least.

Does it matter? :)

Regards,
Kelvin
----- Original Message -----
From: "Strittmatter Stephan (external)"
<Stephan.Strittmatter.ext@kst.siemens.de>
To: "'Lucene Users List'" <lucene-user@jakarta.apache.org>
Sent: Thursday, March 28, 2002 2:54 PM
Subject: RE: Chainable Filter contribution


> Hi Kelvin,
>
> I done som similar only doing XOR for my chains.
> But now your improved filter is better than my own.
> I think I will replace my own by yours.
> Will it be part of Lucene in future?
>
> Regards,
> Stephan
>
> > -----Original Message-----
> > From: Kelvin Tan [mailto:kelvin@relevanz.com]
> > Sent: Thursday, March 28, 2002 2:58 AM
> > To: Armbrust, Daniel C.
> > Cc: lucene-user@jakarta.apache.org
> > Subject: Re: Chainable Filter contribution
> >
> >
> > Dan,
> >
> > Totally my bad. I had since changed it but hadn't posted it
> > to the list coz
> > I didn't think anyone found it useful.
> >
> > Here's the correct version. I haven't really documented since
> > it's pretty
> > straightforward. Just holler if you need any help.
> >
> > Regards,
> > Kelvin
> > ----- Original Message -----
> > From: "Armbrust, Daniel C." <Armbrust.Daniel@mayo.edu>
> > To: <kelvin@relevanz.com>
> > Sent: Thursday, March 28, 2002 5:17 AM
> > Subject: Chainable Filter contribution
> >
> >
> > > I found this in the mailing list, and I do need something
> > like this, as I
> > > need to apply more than one filter at a time.  I'm fairly
> > new to lucene,
> > > however, and my knowledge of BitSets is very limited.
> > >
> > > My question, if you would be so kind as to donate a minute
> > of time to me,
> > is
> > > how does this combine the filters?  From my nieve look
> > through it, it
> > seems
> > > that all filter results would get discarded except for the
> > last filter
> > that
> > > was applied.
> > >
> > >
> > > Thanks,
> > >
> > > Dan
> > >
> > >
> > >
> > > import org.apache.lucene.index.IndexReader;
> > > import org.apache.lucene.search.Filter;
> > >
> > > import java.io.IOException;
> > > import java.util.BitSet;
> > >
> > > /**
> > >  * <p>
> > >  * A ChainableFilter allows multiple filters to be chained
> > >  * such that the result is the intersection of all the
> > >  * filters.
> > >  * </p>
> > >  * <p>
> > >  * Order in which filters are called depends on
> > >  * the position of the filter in the chain. It's probably
> > >  * more efficient to place the most restrictive filters
> > >  * /least computationally-intensive filters first.
> > >  * </p>
> > >  *
> > >  * @author <a href="mailto:kelvin@relevanz.com">Kelvin Tan</a>
> > >  */
> > > public class ChainableFilter extends Filter
> > > {
> > >     /** The filter chain */
> > >     private Filter[] chain = null;
> > >
> > >     /**
> > >      * Creates a new ChainableFilter.
> > >      *
> > >      * @param chain The chain of filters.
> > >      */
> > >     public ChainableFilter(Filter[] chain)
> > >     {
> > >         this.chain = chain;
> > >     }
> > >
> > >     public BitSet bits(IndexReader reader) throws IOException
> > >     {
> > >         BitSet result = null;
> > >         for (int i = 0; i < chain.length; i++)
> > >         {
> > >             result = chain[i].bits(reader);
> > >         }
> > >         return result;
> > >     }
> > > }
> > >
> > >
> >
>
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