/**
* Perform the {@link QueryExecution} once.
*
* @param action
* @param queryExecution
* @param query
* @param queryStringLog Informational string created from the initial query.
* @return
*/
protected SPARQLResult executeQuery(
HttpAction action, QueryExecution queryExecution, Query query, String queryStringLog) {
setAnyTimeouts(queryExecution, action);
if (query.isSelectType()) {
ResultSet rs = queryExecution.execSelect();
// Force some query execution now.
// If the timeout-first-row goes off, the output stream has not
// been started so the HTTP error code is sent.
rs.hasNext();
// If we wanted perfect query time cancellation, we could consume
// the result now to see if the timeout-end-of-query goes off.
// rs = ResultSetFactory.copyResults(rs) ;
// action.log.info(format("[%d] exec/select", action.id)) ;
return new SPARQLResult(rs);
}
if (query.isConstructType()) {
Dataset dataset = queryExecution.execConstructDataset();
// action.log.info(format("[%d] exec/construct", action.id));
return new SPARQLResult(dataset);
}
if (query.isDescribeType()) {
Model model = queryExecution.execDescribe();
// action.log.info(format("[%d] exec/describe", action.id)) ;
return new SPARQLResult(model);
}
if (query.isAskType()) {
boolean b = queryExecution.execAsk();
// action.log.info(format("[%d] exec/ask", action.id)) ;
return new SPARQLResult(b);
}
ServletOps.errorBadRequest("Unknown query type - " + queryStringLog);
return null;
}
void runTestDescribe(Query query, QueryExecution qe) throws Exception {
Model resultsActual = qe.execDescribe();
compareGraphResults(resultsActual, query);
}
/**
* Query SPARQL endpoint with a DESCRIBE query
*
* @param qExec QueryExecution encapsulating the query
* @return model retrieved by querying the endpoint
*/
private Model getDescribeModel(QueryExecution qExec) {
return qExec.execDescribe(ModelFactory.createDefaultModel());
}