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From Steven A Rowe <sar...@syr.edu>
Subject RE: Hits and TopDoc
Date Tue, 20 Oct 2009 22:29:28 GMT
Aha, my bad - I looked on ViewVC at the 2.9.0 *tag*, not the 2.9 *branch*, and LUCENE-1955
emails went in one speaker and out the other.

Steve

> -----Original Message-----
> From: Michael McCandless [mailto:lucene@mikemccandless.com]
> Sent: Tuesday, October 20, 2009 6:20 PM
> To: java-user@lucene.apache.org
> Subject: Re: Hits and TopDoc
> 
> That update to the Hits javadoc didn't make 2.9.0, but will be in
> 2.9.1 (it's committed to the 2.9.x branch now).
> 
> Mike
> 
> On Tue, Oct 20, 2009 at 6:00 PM, Steven A Rowe <sarowe@syr.edu> wrote:
> > Hi Yonik,
> >
> > Hmm, in what version of Hits do you see this updated javadoc?  In the
> 2.9.0 version, the only change in the Hits javadoc from the 2.4.1
> version in this section is that it refers to TopScoreDocCollector
> instead of TopDocCollector:
> >
> >
> http://lucene.apache.org/java/2_9_0/api/core/org/apache/lucene/search/H
> its.html
> >
> > And, of course, Hits has now been removed from trunk as part of the
> deprecation cleansing ritual.
> >
> > Steve
> >
> > On 10/20/2009 at 5:43 PM, Yonik Seeley wrote:
> >> Hmm, yes, I should have thought of quoting the havadoc :-)
> >> The Hits javadoc has been udpated though... we shouldn't be pushing
> >> people toward collectors unless they really need them:
> >>
> >>  *   TopDocs topDocs = searcher.search(query, numHits);
> >>  *   ScoreDoc[] hits = topDocs.scoreDocs;
> >>  *   for (int i = 0; i < hits.length; i++) {
> >>  *     int docId = hits[i].doc;
> >>  *     Document d = searcher.doc(docId);
> >>  *     // do something with current hit
> >>
> >>
> >> -Yonik
> >> http://www.lucidimagination.com
> >>
> >>
> >>
> >> On Tue, Oct 20, 2009 at 5:27 PM, Steven A Rowe <sarowe@syr.edu>
> wrote:
> >> > Hi Nathan,
> >> >
> >> > On 10/20/2009 at 5:03 PM, Nathan Howard wrote:
> >> >> This is sort of related to the above question, but I'm trying to
> >> update
> >> >> some (now depricated) Java/Lucene code that I've become aware of
> >> once we
> >> >> started using 2.4.1 (we were previously using 2.3.2):
> >> >>
> >> >> Hits results = MultiSearcher.search(Query));
> >> >>
> >> >> int start = currentPage * resultsPerPage;
> >> >> int stop = (currentPage + 1) * resultsPerPage();
> >> >>
> >> >> for(int x = start; (x < searchResults.length()) && (x <
stop);
> x++)
> >> >> {
> >> >>     Document doc = searchResults.doc(x);
> >> >>     // do search post-processing with the Document
> >> >> }
> >> >>
> >> >> Results per page is normally small (10ish or so).
> >> >>
> >> >> I'm having difficulty figuring out how to get TopDocs to
> replicate
> >> this
> >> >> paging functionality (which the application must maintain).
> >> >
> >> > From
> >>
> <http://lucene.apache.org/java/2_4_1/api/core/org/apache/lucene/search/
> >> Hits.html>:
> >> > =====
> >> > Deprecated. Hits will be removed in Lucene 3.0.
> >> >
> >> > Instead e. g. TopDocCollector and TopDocs can be used:
> >> >
> >> >   TopDocCollector collector = new TopDocCollector(hitsPerPage);
> >> >   searcher.search(query, collector);
> >> >   ScoreDoc[] hits = collector.topDocs().scoreDocs;
> >> >   for (int i = 0; i < hits.length; i++) {
> >> >     int docId = hits[i].doc;
> >> >     Document d = searcher.doc(docId);
> >> >     // do something with current hit
> >> >     ...
> >> > =====
> >> >
> >> > Construct the TopDocCollector with your "stop" variable instead of
> >> "hitsPerPage", initialize the loop control variable with the value
> of
> >> your "start" variable instead of 0, and you should be good to go.
> >> >
> >> > Steve
> >
> >
> > ---------------------------------------------------------------------
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> > For additional commands, e-mail: java-user-help@lucene.apache.org
> >
> >
> 
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