Make LowerCaseFilter and StopFilter keyword aware, similar to PorterStemFilter
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Key: LUCENE-3236
URL: https://issues.apache.org/jira/browse/LUCENE-3236
Project: Lucene - Java
Issue Type: Improvement
Components: modules/analysis
Affects Versions: 4.0
Environment: N/A
Reporter: Sujit Pal
Priority: Minor
Fix For: 4.0
PorterStemFilter has functionality to detect if a term has been marked as a
"keyword" by the KeywordMarkerFilter (KeywordAttribute.isKeyword() == true),
and if so, skip stemming.
The suggestion is to have the same functionality in other filters where it is
applicable. I think it may be particularly applicable to the LowerCaseFilter
(ie if it is a keyword, don't mess with the case), and StopFilter (if it is a
keyword, then don't filter it out even if it looks like a stop word).
Backward compatibility is maintained (in both cases) by adding a new
constructor which takes an additional boolean parameter ignoreKeyword. The
current constructor will call this new constructor with ignoreKeyword = false.
Patches are attached (for LowerCaseFilter and StopFilter).
I have verified that the analysis JUnit tests run against the updated code, ie,
backward compatibility is maintained.
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