代写代考 ISIT315, Spring 2020

//———————————————————————–
// This is written by a cool lecturer 😉
// SCIT, UOW
// ISIT315, Spring 2020

Copyright By PowCoder代写 加微信 powcoder

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package week4;

import java.io.File;

import org.apache.jena.query.Query;
import org.apache.jena.query.QueryExecution;
import org.apache.jena.query.QueryExecutionFactory;
import org.apache.jena.query.QueryFactory;
import org.apache.jena.query.QuerySolution;
import org.apache.jena.query.ResultSet;
import org.apache.jena.query.ResultSetFactory;
import org.apache.jena.query.ResultSetFormatter;
import org.apache.jena.query.ResultSetRewindable;
import org.apache.jena.rdf.model.Literal;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.riot.Lang;
import org.apache.jena.riot.RDFDataMgr;
import org.apache.jena.sparql.engine.http.QueryEngineHTTP;
import org.apache.jena.util.FileManager;

public class Lecture4 {

public static void main(String[] args) {
// Define RDF files
final String TEMP_DATA = “temp.ttl”;

// Define Query files
final String TEMP_Q = “temp_Q.sparql”;

// Select RDF and Query
String Data = TEMP_DATA;
String Query = TEMP_Q;

String Q1 = System.getProperty(“user.dir”) + File.separator + “src” + File.separator + “main” + File.separator
+ “resources” + File.separator + “queries” + File.separator + Query;

// local execution
Model model = RDFDataMgr.loadModel(System.getProperty(“user.dir”) + File.separator + “src” + File.separator + “main” + File.separator
+ “resources” + File.separator + “data” + File.separator + Data);
executeQuery_Local(Q1, model, true);

public static void executeQuery_Local(String query_string_or_file, Model model, boolean fromFile) {
String query = query_string_or_file;
if (fromFile)
query = QueryFactory.read(query_string_or_file).toString();
if (query.contains(“SELECT”))
select_local(query, model);
else if (query.contains(“CONSTRUCT”)) {
Model graph = construct_local(query, model);
select_local(“SELECT * {?s ?p ?o .}”, graph);
// Write a model in Turtle syntax, default style (pretty printed)
RDFDataMgr.write(System.out, graph, Lang.TURTLE);
} else if (query.contains(“ASK”)) {
System.out.println(ask_local(query, model));
} else if (query.contains(“DESCRIBE”)) {
Model graph = describe_local(query, model);
select_local(“SELECT * {?s ?p ?o .}”, graph);
// Write a model in Turtle syntax, default style (pretty printed)
RDFDataMgr.write(System.out, graph, Lang.TURTLE);

// —————————————————————————————
public static ResultSet select_local(String query_string, Model model) {
ResultSet results = null;
Query query = QueryFactory.create(query_string);
QueryExecution qexec = QueryExecutionFactory.create(query, model);
results = qexec.execSelect();
} finally {
if (results != null)
ResultSetFormatter.out(System.out, results, query);
System.out.println(“no results were found!”);
qexec.close();
return results;

// —————————————————————————————–
public static Model construct_local(String query_string, Model model) {
Model graph = null;
Query query = QueryFactory.create(query_string);
QueryExecution qexec = QueryExecutionFactory.create(query, model);
graph = qexec.execConstruct();
} finally {
qexec.close();
return graph;

// ——————————————————————————————
public static Boolean ask_local(String query_string, Model model) {
Boolean results = null;
Query query = QueryFactory.create(query_string);
QueryExecution qexec = QueryExecutionFactory.create(query, model);
results = qexec.execAsk();
} finally {
qexec.close();
return results;

// ——————————————————————————————
public static Model describe_local(String query_string, Model model) {
Model results = null;
Query query = QueryFactory.create(query_string);
QueryExecution qexec = QueryExecutionFactory.create(query, model);
results = qexec.execDescribe();
} finally {
qexec.close();
return results;

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