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https://issues.apache.org/jira/browse/LUCENE-2055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-2055:
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Attachment: LUCENE-2055.patch
apologies for the large patch.
this patch does the following:
* deprecates RussianTokenizer, RussianStemmer, RussianStemFilter, DutchStemmer,
DutchStemFilter, FrenchStemmer, FrenchStemFilter
* use snowball in the above analyzers instead, depending upon version.
* doesn't deprecate germanstemmer, but uses snowball instead (which is
maintained and relevance-tested and supports things like u+umlaut = ue, etc).
the old stemmer is kept because it is a different algorithm (alternate).
* the dutchstemmer had 'dictionary based stemming override' support, so to
implement this, add StemmerOverrideFilter which does this in a generic way with
KeywordAttribute
* adds KeywordAttribute support to SnowballFilter
* deprecates SnowballAnalyzer in favor of language-specific analyzers.
* adds Romanian and Turkish stopword lists, since snowball is missing them.
* implements language-specific analyzers in place of all the ones snowball
tried to do at once before.
> 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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