Hi,
I've been going through Lucene's code for days now and I'm puzzled as to how the
scoring works.
The scoring is ultimately performed by the Scorer which in turn uses the Similarity
class.
The Similiarity class needs the docFreq(Term t) amd maxDoc() methods.
It calls these methods through the Searcher which is passed [Similarity.idf(Term t,
Searcher searcher)].
Now, the class IndexSearcher, which extends Searcher, refers back to the IndexReader.
Here is the puzzling part:
The method docFreq(Term t) and the method maxDoc() are both declared abstract in
IndexReader.
Faced with this question, I was obliged to check out how it was done in the demo that
comes with Lucene. But the demo still uses IndexSearcher which in turn uses
IndexReader to call these methods.
Can anyone please shed some light here?
Melissa
