public String executeQuery(String queryString) {
/*
//System.out.println(queryString);
Query query = QueryFactory.create(queryString);
QueryExecution qe = QueryExecutionFactory.create(query, model);
ResultSet results = qe.execSelect();
ByteArrayOutputStream ostream = new ByteArrayOutputStream();
ResultSetFormatter.out(ostream, results, query);
//ResultSetFormatter.out(System.out, results, query);
String r = "";
try{
r = new String(ostream.toByteArray(), "UTF-8");
//System.out.println(r);
}
catch(Exception e){
System.out.println(e.getMessage());
}
qe.close();
return r;
*/
//// new added for test JSON output
try {
Query query = QueryFactory.create(queryString);
QueryExecution qe = QueryExecutionFactory.create(query, model);
ResultSet results = qe.execSelect();
ByteArrayOutputStream ostream = new ByteArrayOutputStream();
ResultSetFormatter.outputAsJSON(ostream, results);
// ResultSetFormatter.out(ostream, results, query);
// ResultSetFormatter.out(System.out, results, query);
String r = "";
try {
r = new String(ostream.toByteArray(), "UTF-8");
// System.out.println(r);
} catch (Exception e) {
System.out.println(e.getMessage());
}
qe.close();
return r;
} catch (Exception e) {
System.out.println(e.toString());
return "";
}
}
public ArrayList<QuerySolution> executeQueryRaw(String queryString) {
// System.out.println(queryString);
try {
Query query = QueryFactory.create(queryString);
QueryExecution qe = QueryExecutionFactory.create(query, model);
ResultSet results = qe.execSelect();
/*
ByteArrayOutputStream ostream = new ByteArrayOutputStream();
ResultSetFormatter.out(ostream, results, query);
//ResultSetFormatter.out(System.out, results, query);
String r = "";
try{
r = new String(ostream.toByteArray(), "UTF-8");
System.out.println(r);
}
catch(Exception e){
System.out.println(e.getMessage());
}
*/
/*
ArrayList<QuerySolution> resList = new ArrayList<QuerySolution>();
if(results.hasNext()) {
QuerySolution qs = results.next();
resList.add(qs);
//double x = qs.getLiteral("x").getFloat();
//Literal y = qs.getLiteral("y");
//Literal theta = qs.getLiteral("theta");
}
*/
ArrayList<QuerySolution> resList = (ArrayList) ResultSetFormatter.toList(results);
qe.close();
return resList; // results;
} catch (Exception e) {
System.out.println(e.toString());
return new ArrayList<QuerySolution>();
}
}