/** * 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; }
public static void main(String[] args) { List<String> obj = new ArrayList<String>(); Scanner input = new Scanner(System.in); System.out.print("Enter URI: "); String userIn = input.nextLine(); // create an empty Model Model model = ModelFactory.createDefaultModel(); // read the RDF/XML file model.read(userIn); // write it to standard out // model.write(System.out); // list the statements in the Model StmtIterator iter = model.listStatements(); System.out.println(); // print out the predicate, subject and object of each statement while (iter.hasNext()) { Statement stmt = iter.nextStatement(); // get next statement Resource subject = stmt.getSubject(); // get the subject Property predicate = stmt.getPredicate(); // get the predicate RDFNode object = stmt.getObject(); // get the object System.out.print(subject.toString()); System.out.print(" -> " + predicate.toString() + " -> "); if (object instanceof Resource) { System.out.print(object.toString() + "\n"); } else { // object is a literal System.out.print(" \"" + object.toString() + "\"\n"); } } /* for(int i = 0; i < (obj.size()); i++){ String sparqlQueryString1= "SELECT ?s ?o "+ "WHERE {"+ "?s ?p ?o ."+ "?o <bif:contains> \""+obj.get(i)+"\" ."+ "}"+ "limit 10"; Query query = QueryFactory.create(sparqlQueryString1); QueryExecution qexec = QueryExecutionFactory.sparqlService("http://pubmed.bio2rdf.org/sparql", query); ResultSet results = qexec.execSelect(); System.out.println("Query: "+obj.get(i)); ResultSetFormatter.out(System.out, results, query); qexec.close() ; } */ }