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https://issues.apache.org/jira/browse/LUCENENET-466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238160#comment-13238160
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Björn commented on LUCENENET-466:
---------------------------------
Hello,
maybe it's a good idea to combine the DIN1 and the DIN2 algorithm. At the
moment the DIN2 stemmer "destroys" the root of the word:
Haus => Haus
Häuser => Haeuser
Haeuser => Haeuser
DIN1 means:
ä = a
DIN2 means:
ä = ae
So we could implicit say: ä = ae = a. This corrects the "root" problem:
Haus => Haus
Häuser => Hauser
Haeuser => Hauser
Greetings
Björn
> optimisation for the GermanStemmer.vb
> --------------------------------------
>
> Key: LUCENENET-466
> URL: https://issues.apache.org/jira/browse/LUCENENET-466
> Project: Lucene.Net
> Issue Type: Improvement
> Components: Lucene.Net Contrib
> Affects Versions: Lucene.Net 2.9.4, Lucene.Net 2.9.4g, Lucene.Net 3.0.3
> Reporter: Prescott Nasser
> Priority: Minor
> Fix For: Lucene.Net 3.0.3
>
>
> I have a little optimisation for the GermanStemmer.vb (in
> Contrib.Analyzers) class. At the moment the function "Substitute"
> converts the german "Umlaute" "ä" in "a", "ö" in"o" and "ü" in "u". This
> is not the correct german translation. They must be converted to "ae",
> "oe" and "ue". So I can write the name "Björn" or "Bjoern" but not
> "Bjorn". With this optimization a user can search for "Björn" and also
> find "Bjoern".
>
> Here is the optimized code snippet:
>
> else if ( buffer[c] == 'ä' )
> {
> buffer[c] = 'a';
> buffer.Insert(c + 1, 'e');
> }
> else if ( buffer[c] == 'ö' )
> {
> buffer[c] = 'o';
> buffer.Insert(c + 1,'e');
> }
> else if ( buffer[c] == 'ü' )
> {
> buffer[c] = 'u';
> buffer.Insert(c + 1,'e');
> }
>
> Thank You
> Björn
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