Move Query.weight() to IndexSearcher as protected method
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Key: LUCENE-3208
URL: https://issues.apache.org/jira/browse/LUCENE-3208
Project: Lucene - Java
Issue Type: Bug
Components: core/search
Reporter: Uwe Schindler
Assignee: Uwe Schindler
Fix For: 3.3, 4.0
We had this issue several times, latest in LUCENE-3207.
The method Query.weight() was left in Query for backwards reasons in Lucene 2.9
when we changed Weight class. This method is only to be called on top-level
queries - and this is done by IndexSearcher. This method is just a utility
method, that has nothing to do with the query itsself (it just combines the
createWeight method and calls the normalization afterwards).
The problem we have is that any query that wraps other queries (like
CustomScore, ConstantScore, Boolean) calls Query.weight() instead of
Query.createWeight(), it will do normalization two times, leading to strange
bugs.
For 3.3 I will make Query.weight() simply delegate to IndexSearcher's
replacement method with a big deprecation warning, so user sees this. In
IndexSearcher itsself the method will be protected to only be called by itsself
or subclasses of IndexSearcher. Delegation for backwards is no problem, as
protected is accessible by classes in same package.
I would suggest the method name to be
IndexSearcher.createNormalizedWeight(Query q)
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