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Subject: AW: AW: Determine the index of a hit after using MultiSearcher
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Date: Tue, 29 Nov 2005 16:05:42 +0100
Message-ID: <28CC4850CA7A704FB1980317A99FA036749A@ad1.ad.kbse.net>
Thread-Topic: AW: Determine the index of a hit after using MultiSearcher
Thread-Index: AcX09QEDFFJejvIZS/C4kz0G53ZrbgAARYGQ
From: "Stefan Gusenbauer" <stefan.gusenbauer@kbse.net>
To: <java-user@lucene.apache.org>

This is an other good reason for buying the book ultimately!=20
Thx
stefan

-----Urspr=FCngliche Nachricht-----
Von: Erik Hatcher [mailto:erik@ehatchersolutions.com]=20
Gesendet: Dienstag, 29. November 2005 15:57
An: java-user@lucene.apache.org
Betreff: Re: AW: Determine the index of a hit after using MultiSearcher


On 29 Nov 2005, at 08:51, Stefan Gusenbauer wrote:

> I've done this in the same way every document contains a field with =20
> the corresponding index. I fear there is no other way to do this.

Fear not.   There is a way.  In fact, lucenebook.com uses this =20
capability to determine whether a search hit is from the book content =20
or from the blog content.  Here's a snippet of its code:

       MultiSearcher searcher =3D (MultiSearcher) context.getAttribute=20
("searcher");
       IndexReader[] readers =3D (IndexReader[]) context.getAttribute=20
("readers");

       Hits hits =3D searcher.search(query);

       HttpServletRequest request =3D cycle.getRequestContext=20
().getRequest();
       int currentPage =3D request.getParameter("page") =3D=3D null ? 1 =
: =20
Integer.parseInt(request.getParameter("pa
ge"));

       int numPages =3D (hits.length() / RESULTS_PER_PAGE) + =20
(hits.length() % RESULTS_PER_PAGE =3D=3D 0 ? 0 : 1);
       if (currentPage > numPages) currentPage =3D numPages;
       int numPages =3D (hits.length() / RESULTS_PER_PAGE) + =20
(hits.length() % RESULTS_PER_PAGE =3D=3D 0 ? 0 : 1);
       if (currentPage > numPages) currentPage =3D numPages;
       if (currentPage < 1) currentPage =3D 1;
       setProperty("currentPage", new Integer(currentPage));  // =20
reset in case original value is out of bound
s

       int startHit =3D (currentPage - 1) * RESULTS_PER_PAGE + 1;
       int endHit =3D currentPage * RESULTS_PER_PAGE;
       if (endHit > hits.length()) {
         endHit =3D hits.length();
       }

       setProperty("startHit", new Integer(startHit));
       setProperty("endHit", new Integer(endHit));
       setProperty("numPages", new Integer(numPages));
       setProperty("numHits", new Integer(hits.length()));

       logger.info("Query: " + expression + " : #hits =3D " + =20
hits.length() + " : page=3D" + currentPage);

       if (hits.length() =3D=3D 0) return;

       ArrayList results =3D new ArrayList();
       for (int i =3D startHit; i <=3D endHit; i++) {
         int position =3D i - 1;
         Document doc =3D hits.doc(position);
         int indexIndex =3D searcher.subSearcher(hits.id(position));

         // ...
       }


The trick is to use searcher.subSearcher with the document number =20
from hits.

	Erik


>
>
> -----Urspr=FCngliche Nachricht-----
> Von: pbatcoi@gmx.net [mailto:pbatcoi@gmx.net]
> Gesendet: Dienstag, 29. November 2005 14:48
> An: java-user@lucene.apache.org
> Betreff: Determine the index of a hit after using MultiSearcher
>
> Hello,
>
> I am searching over multiple indices using MultiSearcher. Thus I =20
> get hits
> from various indices. Is it possible to determine from which index =20
> a hit
> comes?
>
> The solution I found is to store the index in a document's field, =20
> but this
> causes some overhead. I would like to find another solution.
>
> Thank you for having read this!
>
> Peter
>
>
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