[JENA-162] Add FROM/FROM NAMED support to Fuseki

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Fuseki 0.2.1
• Fix Version/s: Fuseki 0.2.1
• Component/s: Fuseki
• Labels: from from-named sparql
• Assignee: Rob Vesse
• Reporter: Rob Vesse
• Created: 10/Nov/11 22:14
• Updated: 14/Mar/12 17:40
• Resolved: 14/Mar/12 16:56

Description

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