Make WeightedSpanTermExtractor extensible to handle custom query implemenations
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Key: LUCENE-3665
URL: https://issues.apache.org/jira/browse/LUCENE-3665
Project: Lucene - Java
Issue Type: Improvement
Components: modules/highlighter
Affects Versions: 3.5
Reporter: Simon Willnauer
Priority: Minor
Fix For: 3.6, 4.0
Currently if I have a custom query which subclasses query directly I can't use
the QueryScorer for highlighting since it does explicit instanceof checks. In
some cases its is possible to rewrite the query before passing it to the
highlighter to obtain a primitive query. However I had the usecase where this
was not possible ie. the original index was not available on the machine which
highlights the results. To still use the highlighter I had to copy a bunch of
code due to visibility issues in those classes. I think we can make this
extensible with minor effort to allow this usecase without massive code
duplication.
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