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https://issues.apache.org/jira/browse/LUCENE-2055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828071#action_12828071
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Uwe Schindler commented on LUCENE-2055:
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Several bugs:
- StemOverrideFilter should be final or have final incrementToken()
- The usage of mixed CharArraySet and a conventional dictionary map is buggy.
The CAS is using a different contains algo and lowercasing, you can get a hit
in the CAS but the Map returns null -> NPE. I would not use a CAS for the
beginning and always cast to String for now and I will open an issue for
extending CAS to be a CharArrayMap
> Fix buggy stemmers and Remove duplicate analysis functionality
> --------------------------------------------------------------
>
> Key: LUCENE-2055
> URL: https://issues.apache.org/jira/browse/LUCENE-2055
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/analyzers
> Reporter: Robert Muir
> Fix For: 3.1
>
> Attachments: LUCENE-2055.patch
>
>
> would like to remove stemmers in the following packages, and instead in their
> analyzers use a SnowballStemFilter instead.
> * analyzers/fr
> * analyzers/nl
> * analyzers/ru
> below are excerpts from this code where they proudly proclaim they use the
> snowball algorithm.
> I think we should delete all of this custom stemming code in favor of the
> actual snowball package.
> {noformat}
> /**
> * A stemmer for French words.
> * <p>
> * The algorithm is based on the work of
> * Dr Martin Porter on his snowball project<br>
> * refer to http://snowball.sourceforge.net/french/stemmer.html<br>
> * (French stemming algorithm) for details
> * </p>
> */
> public class FrenchStemmer {
> /**
> * A stemmer for Dutch words.
> * <p>
> * The algorithm is an implementation of
> * the <a
> href="http://snowball.tartarus.org/algorithms/dutch/stemmer.html";>dutch
> stemming</a>
> * algorithm in Martin Porter's snowball project.
> * </p>
> */
> public class DutchStemmer {
> /**
> * Russian stemming algorithm implementation (see
> http://snowball.sourceforge.net for detailed description).
> */
> class RussianStemmer
> {noformat}
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