[COMMONSRDF-55] Stream of Jena quads use wrong IRI for default graph - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 0.3.0
Fix Version/s: 0.5.0
Component/s: jena
Labels:
None

Description

See https://travis-ci.org/apache/commons-rdf/builds/195548479

org.apache.commons.rdf.jena.DatasetJenaTest
streamLanguageTagsCaseInsensitive(org.apache.commons.rdf.jena.DatasetJenaTest)  Time elapsed: 0.012 sec  <<< FAILURE!
java.lang.AssertionError: expected:<<http://example.com/s1> <http://example.com/greeting> "Hello"@EN-GB <urn:x-arq:DefaultGraph>.> but was:<<http://example.com/s1> <http://example.com/greeting> "Hello"@en-GB .>

Jena uses the IRI `<urn:x-arq:DefaultGraph>` internally to represent the default graph within datasets - we need to recognize that on the way out of a `JenaDatasetImpl.stream()` and possibly in the `asQuad(JenaQuad)` converter and replace it with `Optional.empty()` so the default graph appears the same across implementations.

The `AbstractDatasetTest` should be augmented to do more tests on the default graph, including `.stream()`, `.iterate()`, `.contains()` and `.remove()`1.