Add FROM/FROM NAMED support to Fuseki
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Key: JENA-162
URL: https://issues.apache.org/jira/browse/JENA-162
Project: Jena
Issue Type: New Feature
Components: Fuseki
Affects Versions: Fuseki 0.2.1
Reporter: Rob Vesse
Fix For: Fuseki 0.2.1
Attachments: FusekiFromSupport.patch
Fuseki currently does not support FROM/FROM NAMED clauses returning a HTTP 400
error if a user tries to make use of them
The attached patch provides for optional enabling of this feature by a user
specified --from or --allowFrom switch when the server is started or
programmtically via ARQ.getContext().set(Fuseki.enableFromClauses, true).
Therefore unless a user turns this feature on by default the old behavior
remains in place.
When enabled Fuseki will not reject queries with FROM/FROM NAMED in them and
will use DynamicDatasets.dynamicDataset() to build the dataset for queries,
there is minimal overhead for queries without FROM/FROM NAMED clauses as the
code in DynamicDatasets appears to leave the default dataset unchanged if no
dataset description is present in the query AFAICT
A small number of tests has been added to TestQuery.java to test the behaviour,
more tests might be desirable and I can probably supply those if necessary but
the ones given test all the obvious combinations with the trivial test data
used by TestQuery
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