No, the MultiSearcher also exposes all methods, IndexSearcher/Seracher exposes (it inherits it from the superclass IndexSearcher). And a call to the collector is never sortable, because the sorting is done *inside* the hit collector.
Where is your problem with pagination? Normally you choose n to be paginationoffset+count and then display Scoredocs between n .. n+count-1. There is no TopDocCollector that can only collect results 100 to 109. To display results 100 to 109, you need to collect all results up to 109, so call with n=110 and then display scoredoc[100]..scoredoc[109] This is exactly how the old Hits worked. ----- Uwe Schindler H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: Amin Mohammed-Coleman [mailto:ami...@gmail.com] > Sent: Friday, March 20, 2009 6:43 PM > To: java-user@lucene.apache.org > Cc: <java-user@lucene.apache.org>; <paul_t...@fastmail.fm> > Subject: Re: Performance tips on searching > > Hi > > How do you expose a pagination without a customized hit collector. The > multi searcher does not expose a method for hit collector and sort. > Maybe this is not an issue for people ... > > Cheers > > Amin > > On 20 Mar 2009, at 17:25, "Uwe Schindler" <u...@thetaphi.de> wrote: > > > Why not use a MultiSearcher an all single searchers? Or a Searcher > > on a > > MultiReader consisting of all IndexReaders? With that you do not > > need to > > merge the results. > > > > By the way: instead of creating a TopDocCollector, you could also call > > directly, > > > > Searcher.search(Query query, Filter filter, int n, Sort sort) > > Searcher.search(Query query, Filter filter, int n) > > > > Filter can be null. > > > > It's shorter and if sorting is also involved, simplier to handle > > (you do not > > need to switch between ToDocCollector and TopFieldDocCollector). > > > > Important: With Lucene 2.9, the searches will be faster using this API > > (because then each index segment uses an own collector). > > > > Uwe > > > > > > ----- > > Uwe Schindler > > H.-H.-Meier-Allee 63, D-28213 Bremen > > http://www.thetaphi.de > > eMail: u...@thetaphi.de > > > >> -----Original Message----- > >> From: Paul Taylor [mailto:paul_t...@fastmail.fm] > >> Sent: Friday, March 20, 2009 6:02 PM > >> To: java-user@lucene.apache.org > >> Subject: Performance tips on searching > >> > >> > >> Hi, my code receives a search query from the web, there are 5 > >> different > >> searches that can be searched on - each index is searched with a > >> single > >> IndexSearcher referenced in a map. it parses then performs the > >> search > >> and return the best 10 results, with scores readjusted over the > >> results > >> so that the best score returns 1.0. Am I performing the optiminal > >> search > >> methods to do what I want ? > >> > >> thanks Paul > >> > >> IndexSearcher searcher = searchers.get(indexName); > >> QueryParser parser = new QueryParser(indexName, analyzer); > >> TopDocCollector collector = new TopDocCollector(10); > >> try { > >> searcher.search(parser.parse(query), collector); > >> } > >> catch (ParseException e) { > >> } > >> Results results = new Results(); > >> results.totalHits = collector.getTotalHits(); > >> TopDocs topDocs = collector.topDocs(); > >> ScoreDoc docs[] = topDocs.scoreDocs; > >> float maxScore = topDocs.getMaxScore(); > >> for (int i = 0; i < docs.length; i++) { > >> Result result = new Result(); > >> result.score = docs[i].score / maxScore; > >> result.doc = searcher.doc(docs[i].doc); > >> results.results.add(result); > >> } > >> return results; > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > >> For additional commands, e-mail: java-user-h...@lucene.apache.org > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > > For additional commands, e-mail: java-user-h...@lucene.apache.org > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
