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Date: Fri, 29 Jun 2012 06:02:17 -0700 (PDT)
From: Arjun Dhar <dhar_ar@yahoo.com>
To: dev@lucene.apache.org
Message-ID: <1340974937233-3992080.post@n3.nabble.com>
Subject: Query, Searcher, Weight, Similarity = ?
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Hi,
I'm new and that is my disclaimer to the stupid question I am about to ask.

Am trying to form a conceptual picture of the relation between Query <-->
Weight <--> IndexReader, Scorer, Searcher <--> Similarity

*From what I gather : (and someone please validate or correct me) *
1. We want *Queries* to be RE-USABLE instances hence *Weight* is a specific
Queries state !?
2. *Searcher* is STATEFUL, and though it processes a *Query*, the state for
that *Searcher* is delegated to the WEIGHT !?
3. *IndexReader* Reads an Index, and the *Searcher* uses the Reader to
SEARCH, using a QUERY
4.  From the JavaDocs of Weight class ----> "IndexReader dependent state
should reside in the Scorer. " -- Means, when *weights* are calculated, the
final result of the Calculation goes into a STATEFUL object represented by
the *Scorer* which is also Iterable !?
5. *Searcher* can be assigned a *Similarity* algorithm. ... hence using that
algorithm, it calculates *Weight*, which eventually leads to the
construction of an Iterable *Scorer* !?

6. While Indexing, its simple there is a direct relation between
IndexWriterConfig <--> Similarity

+Q) Apart from the validation of my understanding, is there a Sequence
Diagram explaining the process of calculation, during a Query?

+Q) There are different implementations of Queries. Do they differ in how
they mash up all the other stuff?
Looks like if i mess each of the other entities, I can pretty much produce
whatever Query?!

thanks


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