Deprecate SimilarityDelegator and Similarity.lengthNorm
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Key: LUCENE-2854
URL: https://issues.apache.org/jira/browse/LUCENE-2854
Project: Lucene - Java
Issue Type: Improvement
Reporter: Michael McCandless
Fix For: 3.1, 4.0
SimilarityDelegator is a back compat trap (see LUCENE-2828).
Apps should just [statically] subclass Sim or DefaultSim; if they really need
"runtime subclassing" then they can make their own app-level delegator.
Also, Sim.computeNorm subsumes lengthNorm, so we should deprecate lengthNorm in
favor of computeNorm.
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