support protected words in Stemming TokenFilters
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Key: LUCENE-2198
URL: https://issues.apache.org/jira/browse/LUCENE-2198
Project: Lucene - Java
Issue Type: Improvement
Components: Analysis
Affects Versions: 3.0
Reporter: Robert Muir
Priority: Minor
This is from LUCENE-1515
I propose that all stemming TokenFilters have an 'exclusion set' that bypasses
any stemming for words in this set.
Some stemming tokenfilters have this, some do not.
This would be one way for Karl to implement his new swedish stemmer (as a text
file of ignore words).
Additionally, it would remove duplication between lucene and solr, as they
reimplement snowballfilter since it does not have this functionality.
Finally, I think this is a pretty common use case, where people want to ignore
things like proper nouns in the stemming.
As an alternative design I considered a case where we generalized this to
CharArrayMap (and ignoring words would mean mapping them to themselves), which
would also provide a mechanism to override the stemming algorithm. But I think
this is too expert, could be its own filter, and the only example of this i can
find is in the Dutch stemmer.
So I think we should just provide ignore with CharArraySet, but if you feel
otherwise please comment.
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