[JENA-784] NodeUtils.compareRDFTerms() does not handle variable nodes

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Jena 2.12.0
• Fix Version/s: Jena 2.12.1
• Component/s: ARQ
• Assignee: Rob Vesse
• Reporter: Rob Vesse
• Created: 11/Sep/14 09:52
• Updated: 12/Sep/14 12:20
• Resolved: 12/Sep/14 12:20

Description

NodeUtils.compareRDFTerms() does not cope with variable nodes e.g.

Node x = NodeFactory.createVariable("x");
Node y = NodeFactory.createVariable("y");

// This produces an ARQ internal error
int compare = NodeUtils.compareRDFTerms(x, y);

I would propose that we add support for comparing variable nodes making them less than blank nodes in the overall ordering