Osma Suominen created JENA-1488:
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Summary: 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
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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