Rob Vesse created JENA-512:
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Summary: SSE Tags are used inconsistently
Key: JENA-512
URL: https://issues.apache.org/jira/browse/JENA-512
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 2.10.1
Reporter: Rob Vesse
Assignee: Rob Vesse
Priority: Minor
In some of our more recent code we are trying to map functions into a messaging
data structure by inspecting the function symbol. However we have found that
there are some inconsistencies in the symbols.
Namely that the capitalization and punctuation are not consistent, likely this
cannot change as it would mean breaking many existing algebra examples/tests
and systems like ours that use algebra strings internally.
The more concerning inconsistencies are that some functions report symbols
without using the tag constants and so some queries written report symbols that
don't match their tag constants.
BuilderExpr appears to get around this by doing case insensitive key lookup
which seems very hacky
There is also at least one function (isNumeric) which has no Tag constant and
no SSE builder defined for it so queries containing this cannot be decoded from
algebra.
I plan to do two things:
- Make expression classes return their Tags constant where they don't already
and particularly in the cases where the two values aren't exact matches
- Fix the isNumeric case (and any others I discover) where there is no
registered builder for the symbol
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