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https://issues.apache.org/jira/browse/JENA-1488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394326#comment-16394326
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Bruno P. Kinoshita commented on JENA-1488:
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[~code-ferret] your alternative sounds like the best one. Perhaps I should have
dug deeper into the ConfigurableAnalyzer after your first comment, sorry.
>I'm happy to open a separate ticket on this if there is interest. I've
>sketched above the essence of the assembler syntax. The implementation will
>use the same framework as for {{GenericAnalyzerAssembler}} and friends, The
>{{ConfigurableAnalyzer}} will be modified so that the {{getTokenizer}} and
>{{getTokenizerFilter}} use a {{Hashtable}}, as in {{Utils.java}}, to retrieve
>the tokenizers and filters by name.
It does sound like a neat solution. I'm +1 for a separate ticket, and of course
happy to review/test a pull request/patch.
>What parameter types are need for the {{SelectiveFoldingFilter}}?
Just a java.util.List<Character>, but if necessary we can use a
String/CharSequence/etc and build the list of chars out of it. This list is
used as a white-list of characters that are not folded.
Thanks!!!
> SelectiveFoldingFilter for jena-text
> ------------------------------------
>
> Key: JENA-1488
> URL: https://issues.apache.org/jira/browse/JENA-1488
> Project: Apache Jena
> Issue Type: Improvement
> Components: Text
> Affects Versions: Jena 3.6.0
> Reporter: Osma Suominen
> Assignee: Bruno P. Kinoshita
> Priority: Major
>
> Currently there's some support for accent folding in jena-text, because
> Lucene provides an ASCIIFoldingFilter. When this filter is enabled, a search
> for "deja vu" will match the literal "déjà vu" in the data.
> But we can't use it here at the National Library of Finland (for Finto.fi /
> Skosmos), because it folds too much! In the Finnish alphabet, in addition to
> the Latin a-z (which are in ASCII) we use the letters åäö and these should
> not be folded to ASCII. So we need a Lucene analyzer that can be configured
> with an exclude list, something like
>
> new SelectiveFoldingFilter(String excludeChars)
>
> and that can be also be configured via the Jena assembler just like other
> analyzers supported by jena-text.
>
> This was also briefly discussed on the skosmos-users mailing list:
> [https://groups.google.com/d/msg/skosmos-users/x3zR_uRBQT0/Q90-O_iDAQAJ]
> Apparently Norwegians have the same problem...
> I've discussed this with [~kinow] and he has some initial code to implement
> this feature, so I think we can turn this into a PR fairly soon.
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