Thanks Michael, you pointed me in the right direction.
To answer my own question and to close the thread, I didn't need to worry
about passing an instance of Scorer to MyCollector instance. The SetScorer
method is called by the Searcher, so to enable scoring I needed to do 5
things:
1. have an instance of Scorer in MyCollector class
2. have an int member _docBase
private int _docBase;
private Scorer _scorer;
3. implement SetNextReader
public override void SetNextReader(Lucene.Net.Index.IndexReader
reader, int docBase)
{
_docBase = docBase;
}
4. Implement SetScorer
public override void SetScorer(Scorer scorer)
{
_scorer = scorer;
}
5. and finally call _scorer.Score() in Collect method adding _docBase to the
result of _scorer.Score().
Thanks,
Art
On Tue, Mar 9, 2010 at 3:11 AM, Michael Garski <[email protected]>wrote:
> Artem,
>
> The four methods on the Collector abstract class are invoked by the
> searcher that is performing the search, and are up to you to implement
> in your collector as is necessary.
>
> With the change to segment-by-segment searching in 2.9, SetScorer and
> SetNextReader allow the searcher to pass the current Scorer and
> IndexReader to the collector.
>
> The javadocs have the same content as the .NET documentation comments,
> and the one for Collector is:
> http://lucene.apache.org/java/2_9_2/api/all/org/apache/lucene/search/Col
> lector.html<http://lucene.apache.org/java/2_9_2/api/all/org/apache/lucene/search/Col%0Alector.html>
>
> Additionally, take a look at the Test project file Search\QueryUtils.cs
> - there are two Collector implementations in it -
> AnonymousClassCollector & AnonymousClassCollector1 that are good
> examples of how to implement a concrete Collector.
>
> Michael
>
>
>
>
> -----Original Message-----
> From: Artem Chereisky [mailto:[email protected]]
> Sent: Sunday, March 07, 2010 8:27 PM
> To: [email protected]
> Subject: new 2.9 search API
>
> Hi,
>
> I'm migrating my code to 2.9 and I'm having trouble understanding the
> new
> search API
>
> Here is a sample 2.4 code:
>
> var searcher = new IndexSearcher(someReader);
> searcher.SetSimilarity(new MySimilarity());
>
> var hitCollector = new MyHitCollector();
> var query = MyBuildQueryMethod();
>
> searcher.Search(query, hitCollector);
>
> The Collect method of MyHitCollector gets called for every matching
> document
> with a docId and a score based on MySimilarity implementation.
>
> In 2.9 HitCollector is replaced with Collector with 4 abstract methods
> to
> implement. One of them is SetScorer(Scorer). This is where I'm getting
> lost.
> Where do I get an instance of scorer from? There are many, one for each
> query type. I think I'm missing something fundamental. Please clarify.
>
> Regards,
> Art
>
>
