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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: Pagination and Sorting
Date Thu, 01 Oct 2009 12:29:44 GMT
I forgot to mention: Because of this, e.g. even Google (who do not use
Lucene :-]) does not let you go beyond a limit to a very large page number.

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

> -----Original Message-----
> From: Uwe Schindler [mailto:uwe@thetaphi.de]
> Sent: Thursday, October 01, 2009 2:25 PM
> To: java-user@lucene.apache.org
> Subject: RE: Pagination and Sorting
> 
> Hi Chris,
> 
> > Uwe,
> >
> > > You are using TopDocs incorrectly. Normally you use *not*
> > Integer.MAX_VALUE,
> > > as the upper bound of your pagination window as numer of documents. So
> > if
> > > user wants to display documents 90 to 100, just set the number to 100
> > docs.
> > > If the user then goes to docs 100 to 110, just reexecute ther query
> with
> > a
> > > larger value. [...] If somebody goes further, just raise and reexecute
> > query.
> >
> > That's what I thought of as workaround for the first pages.
> 
> That's not a workaround, it is designed to work like this!
> 
> > But at
> > some point the user might want to see the last page of the results,
> > so eventually I will have to call
> >
> >   TopDocs topDocs = indexSearcher.search(query, null, 300500, sort);
> >
> > and still run into an error. Right now I'd present the user with an
> > error message like "The search returned too many results, please further
> > restrict your search" but a more generic solution would sound a lot
> > better ;)
> 
> How about sorting backwards in this case (and print out the page in
> reverse
> to get a forward-printed page again)?
> 
> Uwe
> 
> 
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