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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: ConjunctionScorer access
Date Thu, 22 Oct 2015 14:58:54 GMT
Hi,

How about using delegate.getChildren() [delegate is the ConjunctionScorer you wrap] in your
FilterScorer? By that you get a List of all ChildScorer instances with "MUST" as type and
a reference to the Scorer itsself. You can use those in the FilterScorer's score() method
to get subscores for each child.

Uwe

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


> -----Original Message-----
> From: Sheng [mailto:shengcer@gmail.com]
> Sent: Thursday, October 22, 2015 4:06 PM
> To: java-user@lucene.apache.org
> Subject: Re: ConjunctionScorer access
> 
> That's the problem right - none of them are public, and even neither is the
> constructor of `ConjunctionScorer`. Moreover, `ConjunctionScorer` needs
> access to list of sub-scorers to emit the doc and score. Information like this
> has to come from the `BooleanWeight`, which is another hack if I want to
> leverage this.
> 
> On Thu, Oct 22, 2015 at 9:22 AM, Alan Woodward <alan@flax.co.uk> wrote:
> 
> > You should be able to use a FilterScorer that wraps a
> > ConjunctionScorer and overrides score().
> >
> > Alan Woodward
> > www.flax.co.uk
> >
> >
> > On 22 Oct 2015, at 13:43, Sheng wrote:
> >
> > > Thanks for the reply and suggestion. If I search for term A and term
> > > B
> > with
> > > a BooleanQuery in Lucene, normally Lucene returns documents that
> > > have a match of both A and B. Now I am using payload to vary the
> > > scores w.r.t search of term A and search of term B, so it is
> > > possible for example a document has both match of term A and term B,
> > > but only the score for
> > term A
> > > is 0. In this case, I want Lucene does not return this document  at all.
> > > However the internal ConjunctionScorer will just sum up the scores
> > returned
> > > by both subquery of A and B, thus the document has a score > 0
> > > returned
> > by
> > > the BooleanQuery, and therefore it cannot be filtered by a
> > > PositiveScoreOnlyCollector. I know hacking into ConjunctionScorer
> > probably
> > > is too intrusive, but wondering if there is a better way to achieve
> > > the same effect ?
> > >
> > > On Thu, Oct 22, 2015 at 4:13 AM, Uwe Schindler <uwe@thetaphi.de>
> wrote:
> > >
> > >> Hi,
> > >>
> > >> Those are internal classes and not to be extended (not only the
> > >> constructor is pkg-private, the whole class is: https://goo.gl/5WyLYz)!
> > >> Scorers follow the delegator pattern. If you want to modify the
> > behaviour
> > >> of a Scorer, create a delegator scorer (e.g. some Filtering Scorer)
> > >> and change its behaviour (e.g. filter additional documents,...).
> > >> This can be done by a query that filters other querys. E.g. look at
> > ConstantScoreQuery
> > >> or similar queries that wrap other scorers.
> > >>
> > >> Subclassing ConjunctionScorer would bring you nothing because
> > >> internals are still private - and that's good.
> > >>
> > >> Uwe
> > >>
> > >> -----
> > >> Uwe Schindler
> > >> H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de
> > >> eMail: uwe@thetaphi.de
> > >>
> > >>
> > >>> -----Original Message-----
> > >>> From: Sheng [mailto:shengcer@gmail.com]
> > >>> Sent: Wednesday, October 21, 2015 7:03 PM
> > >>> To: java-user@lucene.apache.org
> > >>> Subject: ConjunctionScorer access
> > >>>
> > >>> It's a bummer Lucene makes the constructor of ConjunctionScorer
> non-
> > >>> public. I wanted to extend from this class in order to tweak its
> > >> behavior for
> > >>> my use case. Is it possible to change it to protected in future
> > releases
> > >> ?
> > >>
> > >>
> > >> ---------------------------------------------------------------------
> > >> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > >> For additional commands, e-mail: java-user-help@lucene.apache.org
> > >>
> > >>
> >
> >


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