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  1. Apache Jena
  2. JENA-1488

SelectiveFoldingFilter for jena-text

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: Jena 3.6.0
    • Fix Version/s: Jena 3.8.0
    • Component/s: Text
    • Labels:
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      Description

      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 Bruno P. Kinoshita 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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              • Assignee:
                kinow Bruno P. Kinoshita
                Reporter:
                osma Osma Suominen
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                • Created:
                  Updated:
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