/** Return a list of all tests of the given type, according to the current filters */
 public List<Resource> findTestsOfType(Resource testType) {
   ArrayList<Resource> result = new ArrayList<>();
   StmtIterator si = testDefinitions.listStatements(null, RDF.type, testType);
   while (si.hasNext()) {
     Resource test = si.nextStatement().getSubject();
     boolean accept = true;
     // Check test status
     Literal status = (Literal) test.getProperty(RDFTest.status).getObject();
     if (approvedOnly) {
       accept = status.getString().equals(STATUS_FLAGS[0]);
     } else {
       accept = false;
       for (String STATUS_FLAG : STATUS_FLAGS) {
         if (status.getString().equals(STATUS_FLAG)) {
           accept = true;
           break;
         }
       }
     }
     // Check for blocked tests
     for (String BLOCKED_TEST : BLOCKED_TESTS) {
       if (BLOCKED_TEST.equals(test.toString())) {
         accept = false;
       }
     }
     // End of filter tests
     if (accept) {
       result.add(test);
     }
   }
   return result;
 }
  /**
   * Query SPARQL endpoint with a SELECT query
   *
   * @param qExec QueryExecution encapsulating the query
   * @return model retrieved by querying the endpoint
   */
  private Model getSelectModel(QueryExecution qExec) {
    Model model = ModelFactory.createDefaultModel();
    Graph graph = model.getGraph();
    ResultSet results = qExec.execSelect();

    while (results.hasNext()) {
      QuerySolution sol = results.next();
      String subject;
      String predicate;
      RDFNode object;

      try {
        subject = sol.getResource("s").toString();
        predicate = sol.getResource("p").toString();
        object = sol.get("o");
      } catch (NoSuchElementException e) {
        logger.error("SELECT query does not return a (?s ?p ?o) Triple");
        continue;
      }

      Node objNode;
      if (object.isLiteral()) {
        Literal obj = object.asLiteral();
        objNode = NodeFactory.createLiteral(obj.getString(), obj.getDatatype());
      } else {
        objNode = NodeFactory.createLiteral(object.toString());
      }

      graph.add(
          new Triple(NodeFactory.createURI(subject), NodeFactory.createURI(predicate), objNode));
    }

    return model;
  }