[JENA-1855] TRIG parser yields NULL-graph for quads in default graph

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Jena 3.14.0
• Fix Version/s: Jena 3.15.0
• Component/s: RIOT
• Assignee: Andy Seaborne
• Reporter: Claus Stadler
• Created: 08/Mar/20 11:50
• Updated: 19/May/20 10:26
• Resolved: 11/Mar/20 13:08

Description

Hi Jena Team and Andy, thanks for all your great work on Jena and fixing all my recent issues, but I found another one

The Trig Parser yields quads with a null value in the graph component for data in the default graph. It should be Quad.defaultGraphNodeGenerated.

Test data:

# test.trig
@base <http://www.example.org/base-> .
@prefix : <http://www.example.org/prefx-> .

<s> <p> <o> .
:x :y :z .

Iterator<Quad> it = RDFDataMgr.createIteratorQuads(RDFDataMgr.open("test.trig"), Lang.TRIG, null);
while(it.hasNext()) {
	Quad q = it.next();
	System.out.println(q.getGraph());
}

null
null

This causes quite unexpected null pointer exceptions, such as in this simple scenario:

		
Dataset ds = RDFDataMgr.loadDataset("test.trig");
System.out.println(ds.asDatasetGraph().size());

Issue Links

• links to: GitHub Pull Request #706