[JENA-345] execConstructTriples() does not eliminate malformed triples from it's output

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: ARQ 2.9.4
• Fix Version/s: Jena 2.10.0
• Component/s: ARQ
• Labels: construct sparql
• Assignee: Rob Vesse
• Reporter: Rob Vesse
• Created: 09/Nov/12 17:55
• Updated: 17/Nov/12 17:58
• Resolved: 09/Nov/12 18:06

Description

Start from any model which has triples containing only literals as their subjects, then try the following:

@Test public void testConstructRejectsBadTriples1()
{
String queryString = "CONSTRUCT

{ ?s ?p ?o } WHERE { ?o ?p ?s }";
Query q = QueryFactory.create(queryString);

QueryExecution qExec = QueryExecutionFactory.create(q, m);

Model resultModel = qExec.execConstruct();
assertEquals(0, resultModel.size());
}

@Test public void testConstructRejectsBadTriples2()
{
String queryString = "CONSTRUCT { ?s ?p ?o }

WHERE

{ ?o ?p ?s }

";
Query q = QueryFactory.create(queryString);

QueryExecution qExec = QueryExecutionFactory.create(q, m);

Iterator<Triple> ts = qExec.execConstructTriples();
long count = 0;
while (ts.hasNext())

{ count++; ts.next(); }

assertEquals(0, count);
}

The first test passes because execConstruct() correctly rejects triples with literal subjects as invalid, the second test fails because execConstructTriples() does not follow this behavior.