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From: "Uwe Schindler" <uwe@thetaphi.de>
To: <java-user@lucene.apache.org>
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Subject: RE: Extracting all documents for a given search
Date: Mon, 19 Sep 2011 08:27:44 +0200
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In recent Lucene versions there is an implementation of the mentioned =
collector to count hits, so there is no need to implement it:
http://lucene.apache.org/java/3_4_0/api/core/org/apache/lucene/search/Tot=
alHitCountCollector.html

Uwe

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de


> -----Original Message-----
> From: Trejkaz [mailto:trejkaz@trypticon.org]
> Sent: Monday, September 19, 2011 8:10 AM
> To: java-user@lucene.apache.org
> Subject: Re: Extracting all documents for a given search
>=20
> On Mon, Sep 19, 2011 at 3:50 AM, Charlie Hubbard
> <charlie.hubbard@gmail.com> wrote:
> > Here was the prior API I was calling:
> >
> >        Hits hits =3D getSearcher().search( query, filter, sort );
> >
> > The new API:
> >
> >        TopDocs hits =3D getSearcher().search( query, filter, =
startDoc +
> > length, sort );
> >
> > So the question is what new API can I use that allows me to extract
> > all documents matching the query, sort, and filter in a efficient =
way?
>=20
> How I do this:
>=20
>     // 1. Figure out how many results there will be.
>     class CountCollector extends Collector {
>         int count;
>         public void collect(int doc) {
>             count++;
>         }
>         // ... other empty methods ...
>     }
>     CountCollector collector =3D new CountCollector();
>     getSearcher().search(query, filter, collector);
>     int hitCount =3D collector.count;
>=20
>     // 2. Actually do the query.
>     hits =3D getSearcher().search(query, filter, hitCount, sort);
>=20
> It is a bit unfortunate that there is no equivalent to TopDocs which =
can grow
> dynamically, but this way is still going to be faster than Hits was, =
for larger
> result sets.
>=20
> TX
>=20
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