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From "Sujit Pal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3236) Make LowerCaseFilter and StopFilter keyword aware, similar to PorterStemFilter
Date Thu, 23 Jun 2011 21:00:49 GMT
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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