Artem,
You're on the right track, except for step 5. The score comes directly
from the Scorer.Score() method, docBase is added to the document id
passed into Collect to get the overall index document number. The
number passed into Collect is the number of the document in the
current segment being searched.
Michael
On Mar 8, 2010, at 8:44 PM, "Artem Chereisky" <[email protected]>
wrote:
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
