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From "Strittmatter Stephan (external)" <Stephan.Strittmatter....@kst.siemens.de>
Subject RE: Chainable Filter contribution
Date Thu, 28 Mar 2002 07:43:13 GMT
Kevin,

it does no matter, but would be nice.

Stephan

> -----Original Message-----
> From: Kelvin Tan [mailto:kelvin@relevanz.com]
> Sent: Thursday, March 28, 2002 8:15 AM
> To: Lucene Users List
> Subject: Re: Chainable Filter contribution
> 
> 
> 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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> >
> 
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