Exemplo n.º 1
0
  private void upload(URI graphURI, Resource context) throws Exception {
    RepositoryConnection con = dataRep.getConnection();
    con.setAutoCommit(false);
    try {
      RDFFormat rdfFormat = Rio.getParserFormatForFileName(graphURI.toString(), RDFFormat.TURTLE);
      RDFParser rdfParser = Rio.createParser(rdfFormat, dataRep.getValueFactory());
      rdfParser.setVerifyData(false);
      rdfParser.setDatatypeHandling(DatatypeHandling.IGNORE);
      // rdfParser.setPreserveBNodeIDs(true);

      RDFInserter rdfInserter = new RDFInserter(con);
      rdfInserter.enforceContext(context);
      rdfParser.setRDFHandler(rdfInserter);

      URL graphURL = new URL(graphURI.toString());
      InputStream in = graphURL.openStream();
      try {
        rdfParser.parse(in, graphURI.toString());
      } finally {
        in.close();
      }

      con.setAutoCommit(true);
    } finally {
      con.close();
    }
  }
Exemplo n.º 2
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  public void setupInMemory() throws Exception {
    // create a sesame in-memory repository
    String owlfile = "src/test/resources/onto2.owl";

    repo = new SesameClassicInMemoryRepo("my_name", owlfile, false, "TreeWitness");
    repo.initialize();
    con = (RepositoryConnection) repo.getConnection();
  }
Exemplo n.º 3
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  protected void load(final String modelPathWithoutExtension)
      throws RepositoryException, RDFParseException, IOException {
    final File modelFile = new File(modelPathWithoutExtension + getPostfix());

    repository.initialize();
    connection = repository.getConnection();
    connection.add(modelFile, RDFConstants.BASE_PREFIX, RDFFormat.TURTLE);
  }
Exemplo n.º 4
0
  /**
   * Creating local repository, the standard way to get a Sesame-RDF repository.
   *
   * @param tempDir Warning! if not <code>null</code> then it will reuse the data left in this
   *     directory from the previous session.
   * @return
   * @throws ConfigurationException
   */
  public static Repository createLocalRepository(File tempDir) throws RepositoryException {
    // initializing RDF repository
    Repository myRepository =
        new SailRepository(new ForwardChainingRDFSInferencer(new MemoryStore(tempDir))); // ,
    // NB! MemoryStore(dir) will restore its contents!

    myRepository.initialize();
    return myRepository;
  }
Exemplo n.º 5
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  public static LoadStatementsResult loadStatements(String file, String tempDir, PrintStream... out)
      throws Exception {
    LoadStatementsResult result = new LoadStatementsResult();
    // loading
    Repository rdf = Helper.createLocalRepository();
    RepositoryConnection con = rdf.getConnection();
    try {

      importRDFXMLFile(rdf, "http://localhost/namespace", new File(file));

      RepositoryResult<Statement> statements = con.getStatements(null, null, null, false);
      try {
        while (statements.hasNext()) {
          Statement st = statements.next();
          if (st instanceof MemStatement) {
            if (((MemStatement) (st)).isExplicit()) {
              String property = st.getPredicate().toString();
              result.subjects.add(st.getSubject().toString());
              result.properties.add(st.getPredicate().toString());

              String[] subject = st.getSubject().toString().split("#");

              boolean isResource = (st.getObject() instanceof Resource);
              if (isResource) {
                result.values.add("R:" + st.getObject().stringValue());
              } else {
                result.values.add(
                    "L"
                        + ((Literal) st.getObject()).getLanguage()
                        + ":"
                        + st.getObject().stringValue());
              }

              if (subject.length == 2) {
                result.statements.add(
                    formatLine(
                        subject[0] + "#" /* ":" */ + subject[1],
                        property,
                        isResource,
                        st.getObject().toString()));
              } else {
                if (subject.length > 2)
                  throw new Exception("Multiple # in resource " + st.getSubject());
                result.statements.add(
                    formatLine(subject[0], property, isResource, st.getObject().toString()));
              }
            }
          } else throw new Exception("ERROR");
        }
      } finally {
        statements.close();
      }
    } finally {
      con.close();
    }
    return result;
  }
Exemplo n.º 6
0
 /** Creating local repository, the standard way to get a Sesame-RDF repository. */
 public static Repository createLocalRepository() throws RepositoryException {
   // initializing RDF repository
   Repository repository =
       new SailRepository(
           new DirectTypeHierarchyInferencer(
               new ForwardChainingRDFSInferencer(new MemoryStore())));
   // NB! MemoryStore(dir) will restore its contents!
   repository.initialize();
   return repository;
 }
  public TestSuite createTestSuite() throws Exception {
    // Create test suite
    TestSuite suite = new TestSuite(N3ParserTestCase.class.getName());

    // Add the manifest to a repository and query it
    Repository repository = new SailRepository(new MemoryStore());
    repository.initialize();
    RepositoryConnection con = repository.getConnection();

    URL url = url(MANIFEST_URL);
    con.add(url, base(MANIFEST_URL), RDFFormat.TURTLE);

    // Add all positive parser tests to the test suite
    String query =
        "SELECT testURI, inputURL, outputURL "
            + "FROM {testURI} rdf:type {n3test:PositiveParserTest}; "
            + "               n3test:inputDocument {inputURL}; "
            + "               n3test:outputDocument {outputURL} "
            + "USING NAMESPACE n3test = <http://www.w3.org/2004/11/n3test#>";

    TupleQueryResult queryResult = con.prepareTupleQuery(QueryLanguage.SERQL, query).evaluate();
    while (queryResult.hasNext()) {
      BindingSet bindingSet = queryResult.next();
      String testURI = bindingSet.getValue("testURI").toString();
      String inputURL = bindingSet.getValue("inputURL").toString();
      String outputURL = bindingSet.getValue("outputURL").toString();

      suite.addTest(new PositiveParserTest(testURI, inputURL, outputURL));
    }

    queryResult.close();

    // Add all negative parser tests to the test suite
    query =
        "SELECT testURI, inputURL "
            + "FROM {testURI} rdf:type {n3test:NegativeParserTest}; "
            + "               n3test:inputDocument {inputURL} "
            + "USING NAMESPACE n3test = <http://www.w3.org/2004/11/n3test#>";

    queryResult = con.prepareTupleQuery(QueryLanguage.SERQL, query).evaluate();

    while (queryResult.hasNext()) {
      BindingSet bindingSet = queryResult.next();
      String testURI = bindingSet.getValue("testURI").toString();
      String inputURL = bindingSet.getValue("inputURL").toString();

      suite.addTest(new NegativeParserTest(testURI, inputURL));
    }
    queryResult.close();
    con.close();
    repository.shutDown();

    return suite;
  }
Exemplo n.º 8
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 protected Repository createRepository() throws Exception {
   Repository repo = newRepository();
   repo.initialize();
   RepositoryConnection con = repo.getConnection();
   try {
     con.clear();
     con.clearNamespaces();
   } finally {
     con.close();
   }
   return repo;
 }
  @Override
  public boolean toRdf(final Repository myRepository, final int modelVersion, final URI... keyToUse)
      throws OpenRDFException {
    super.toRdf(myRepository, modelVersion, keyToUse);

    final RepositoryConnection con = myRepository.getConnection();

    try {
      if (SpinInferencingRuleImpl.DEBUG) {
        SpinInferencingRuleImpl.log.debug(
            "SparqlNormalisationRuleImpl.toRdf: keyToUse=" + keyToUse);
      }

      final URI keyUri = this.getKey();

      con.setAutoCommit(false);

      con.add(
          keyUri, RDF.TYPE, SpinInferencingRuleSchema.getSpinInferencingRuleTypeUri(), keyToUse);

      // If everything went as planned, we can commit the result
      con.commit();

      return true;
    } catch (final RepositoryException re) {
      // Something went wrong during the transaction, so we roll it back
      con.rollback();

      SpinInferencingRuleImpl.log.error("RepositoryException: " + re.getMessage());
    } finally {
      con.close();
    }

    return false;
  }
Exemplo n.º 10
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  /**
   * Execute a SELECT SPARQL query against the graphs
   *
   * @param qs SELECT SPARQL query
   * @return list of solutions, each containing a hashmap of bindings
   */
  public List<HashMap<String, Value>> runSPARQL(String qs) {
    try {
      RepositoryConnection con = currentRepository.getConnection();
      try {
        TupleQuery query = con.prepareTupleQuery(org.openrdf.query.QueryLanguage.SPARQL, qs);
        TupleQueryResult qres = query.evaluate();
        ArrayList<HashMap<String, Value>> reslist = new ArrayList<HashMap<String, Value>>();
        while (qres.hasNext()) {
          BindingSet b = qres.next();

          Set<String> names = b.getBindingNames();
          HashMap<String, Value> hm = new HashMap<String, Value>();
          for (String n : names) {
            hm.put(n, b.getValue(n));
          }
          reslist.add(hm);
        }
        return reslist;
      } finally {
        con.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }
Exemplo n.º 11
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    public ResponseHandler(String resource, Endpoint endpoint) throws RepositoryException {
      this.resource = resource;
      this.endpoint = endpoint;

      triples = new SailRepository(new MemoryStore());
      triples.initialize();
    }
Exemplo n.º 12
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  @Override
  public void reInitialize() throws Exception {
    log.info("Reinitializing repository and connection due to error in past results.");

    if (conn.isOpen()) {
      try {
        log.debug("Trying to close connection, interrupt time is 10000");
        Utils.closeConnectionTimeout(conn, 10000);

      } catch (Exception e) {; /*ignore*/
      }
    }

    if (sailRepo != null) {
      boolean shutDown =
          Utils.shutdownRepositoryTimeout(
              sailRepo, 20 * 60 * 1000); // timeout of 20 min for shutdown
      sailRepo = null;
      if (shutDown) log.debug("Repository shut down.");
      else log.debug("Failed to shut down repository within 20 minutes!");
    }

    //		log.info("Waiting for 2 minutes to give server time for reinitialization");
    //		Thread.sleep(120000);
    log.debug("loading repositories from scratch.");
    System.gc();
    sailRepo = SesameRepositoryLoader.loadRepositories(new VoidReportStream());
    conn = sailRepo.getConnection();
    log.debug("reinitialize done.");
  }
Exemplo n.º 13
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 @Override
 protected void tearDown() throws Exception {
   if (dataRep != null) {
     dataRep.shutDown();
     dataRep = null;
   }
 }
Exemplo n.º 14
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 private void saveLog(DefaultQueryLog log) {
   try {
     RepositoryConnection conn = null;
     try {
       conn = repository.getConnection();
       ValueFactory vf = conn.getValueFactory();
       URI queryURI = vf.createURI(NS_QUERY + queryId);
       URI logURI = vf.createURI(NS_QUERY + log.timestamp());
       conn.add(queryURI, RDF.TYPE, vf.createURI(NS_QUERY + "Query"));
       conn.add(queryURI, vf.createURI(NS_QUERY + "log"), logURI);
       conn.add(logURI, RDF.TYPE, vf.createURI(NS_QUERY + "QueryLog"));
       conn.add(logURI, vf.createURI(NS_QUERY + "timestamp"), vf.createLiteral(log.timestamp()));
       for (QueryResultBindingSet set : log.result()) {
         BNode setURI = vf.createBNode();
         conn.add(logURI, vf.createURI(NS_QUERY + "bindingSet"), setURI);
         for (QueryResultBinding binding : set) {
           BNode bindingURI = vf.createBNode();
           conn.add(setURI, vf.createURI(NS_QUERY + "binding"), bindingURI);
           conn.add(bindingURI, vf.createURI(NS_QUERY + "name"), vf.createLiteral(binding.name()));
           conn.add(
               bindingURI, vf.createURI(NS_QUERY + "value"), vf.createLiteral(binding.value()));
         }
       }
     } finally {
       if (conn != null) {
         conn.close();
       }
     }
   } catch (Exception e) {
     throw new RuntimeException(e);
   }
 }
Exemplo n.º 15
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  private String serialize(final Repository repo) throws RDFHandlerException, RepositoryException {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    RDFWriter w = Rio.createWriter(format, bos);

    RepositoryConnection rc = repo.getConnection();
    try {
      rc.export(w);
    } finally {
      rc.close();
    }

    String s = new String(bos.toByteArray());

    if (RDFFormat.RDFXML == format || RDFFormat.TRIX == format) {
      // Chop off the XML declaration.
      int i = s.indexOf('\n');
      s = s.substring(i + 1);
    }

    s = s.replaceAll("\n", "");

    s = "<" + TAGNAME + " xmlns='" + NAMESPACE + "'>" + s + "</" + TAGNAME + ">";
    // s = s.replaceAll("<rdf:", "<");
    // s = s.replaceAll("</rdf:", "</");
    // System.out.println("s = " + s);

    return s;
    // return "<body><one>foo</two></body>";
    // return "<content><one/></content>";
    // return "<body></body>";
  }
Exemplo n.º 16
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  public void loadDataFromURL(String stringURL) {
    RepositoryConnection con;
    try {
      con = currentRepository.getConnection();
      try {
        // upload a URL
        URL url = new URL(stringURL);
        con.add(url, null, RDFFormat.RDFXML);

      } catch (RDFParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (RepositoryException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } finally {
        try {
          con.close();
        } catch (RepositoryException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
    } catch (RepositoryException e1) {
      // TODO Auto-generated catch block
      e1.printStackTrace();
    }
  }
Exemplo n.º 17
0
 /**
  * Insert Triple/Statement into graph
  *
  * @param s subject uriref
  * @param p predicate uriref
  * @param o value object (URIref or Literal)
  * @param contexts varArgs context objects (use default graph if null)
  */
 public void add(Resource s, URI p, Value o, Resource... contexts) {
   if (log.isDebugEnabled())
     log.debug(
         "[SesameDataSet:add] Add triple ("
             + s.stringValue()
             + ", "
             + p.stringValue()
             + ", "
             + o.stringValue()
             + ").");
   try {
     RepositoryConnection con = currentRepository.getConnection();
     try {
       ValueFactory myFactory = con.getValueFactory();
       Statement st = myFactory.createStatement((Resource) s, p, (Value) o);
       con.add(st, contexts);
       con.commit();
     } catch (Exception e) {
       e.printStackTrace();
     } finally {
       con.close();
     }
   } catch (Exception e) {
     // handle exception
   }
 }
Exemplo n.º 18
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  /**
   * Load data in specified graph (use default graph if contexts is null)
   *
   * @param filePath
   * @param format
   * @param contexts
   */
  public void loadDataFromFile(String filePath, RDFFormat format, Resource... contexts) {
    RepositoryConnection con;
    try {
      con = currentRepository.getConnection();
      try {
        // upload a file
        File f = new File(filePath);
        con.add(f, null, format, contexts);

      } catch (RDFParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (RepositoryException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } finally {
        try {
          con.close();
        } catch (RepositoryException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
    } catch (RepositoryException e1) {
      // TODO Auto-generated catch block
      e1.printStackTrace();
    }
  }
Exemplo n.º 19
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  private void calculateGraphsAndDataSets() {
    try {
      RepositoryConnection conn = repository.getConnection();
      TupleQuery q = conn.prepareTupleQuery(QueryLanguage.SPARQL, SparqlUtils.PREFIXES + QUERY);
      TupleQueryResult results = q.evaluate();
      graphs = new LinkedList<DataCubeGraph>();
      datasets = new LinkedList<DataSet>();
      String lastG = null;
      String lastDSD = null;
      SparqlDCGraph dcGraph;
      SparqlStructure dcStructure = null;
      Collection<DataSet> graphDataSets = null;
      Collection<Structure> graphStructures = null;
      Collection<DataSet> structDataSets = null;
      while (results.hasNext()) {
        BindingSet set = results.next();
        String g = set.getValue("g").stringValue();
        String ds = set.getValue("ds").stringValue();
        String dsd = set.getValue("dsd").stringValue();

        if (!g.equals(lastG)) {
          // new Graph
          dcGraph = new SparqlDCGraph(repository, g);
          graphDataSets = new LinkedList<DataSet>();
          graphStructures = new LinkedList<Structure>();
          dcGraph.setDatasets(graphDataSets);
          dcGraph.setStructures(graphStructures);
          graphs.add(dcGraph);
          // new structure
          dcStructure = new SparqlStructure(repository, dsd, g);
          structDataSets = new LinkedList<DataSet>();
          dcStructure.setDatasets(structDataSets);
          graphStructures.add(dcStructure);
        } else if (!dsd.equals(lastDSD)) {
          // new structure
          dcStructure = new SparqlStructure(repository, dsd, g);
          structDataSets = new LinkedList<DataSet>();
          dcStructure.setDatasets(structDataSets);
          graphStructures.add(dcStructure);
        }

        SparqlDataSet dcDataSet = new SparqlDataSet(repository, ds, g);
        dcDataSet.setStructure(dcStructure);
        graphDataSets.add(dcDataSet);
        structDataSets.add(dcDataSet);
        datasets.add(dcDataSet);

        lastG = g;
        lastDSD = dsd;
      }
    } catch (RepositoryException ex) {
      Logger.getLogger(SparqlDCRepository.class.getName()).log(Level.SEVERE, null, ex);
    } catch (MalformedQueryException ex) {
      Logger.getLogger(SparqlDCRepository.class.getName()).log(Level.SEVERE, null, ex);
    } catch (QueryEvaluationException ex) {
      Logger.getLogger(SparqlDCRepository.class.getName()).log(Level.SEVERE, null, ex);
    }
  }
  /**
   * This test verifies whether the transparent caching works for the three resources provided by
   * our dummy provider.
   *
   * @throws Exception
   */
  @Test
  public void testCachedResources() throws Exception {
    String uri1 = "http://localhost/resource1";
    String uri2 = "http://localhost/resource2";
    String uri3 = "http://localhost/resource3";

    RepositoryConnection con = repository.getConnection();
    try {
      con.begin();

      List<Statement> list1 =
          Iterations.asList(
              con.getStatements(con.getValueFactory().createURI(uri1), null, null, true));

      Assert.assertEquals(3, list1.size());
      Assert.assertThat(
          list1,
          allOf(
              CoreMatchers.<Statement>hasItem(hasProperty("object", hasToString("\"Value 1\""))),
              CoreMatchers.<Statement>hasItem(hasProperty("object", hasToString("\"Value X\"")))));

      con.commit();

      con.begin();

      List<Statement> list2 =
          Iterations.asList(
              con.getStatements(con.getValueFactory().createURI(uri2), null, null, true));

      Assert.assertEquals(2, list2.size());
      Assert.assertThat(
          list2,
          allOf(
              CoreMatchers.<Statement>hasItem(hasProperty("object", hasToString("\"Value 2\"")))));

      con.commit();

      con.begin();

      List<Statement> list3 =
          Iterations.asList(
              con.getStatements(con.getValueFactory().createURI(uri3), null, null, true));

      Assert.assertEquals(2, list3.size());
      Assert.assertThat(
          list3,
          allOf(
              CoreMatchers.<Statement>hasItem(hasProperty("object", hasToString("\"Value 3\""))),
              CoreMatchers.<Statement>hasItem(hasProperty("object", hasToString("\"Value 4\"")))));

      con.commit();
    } catch (RepositoryException ex) {
      con.rollback();
    } finally {
      con.close();
    }
  }
Exemplo n.º 21
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 public SesameDataSet(String sesameServer, String repositoryID) {
   currentRepository = new HTTPRepository(sesameServer, repositoryID);
   try {
     currentRepository.initialize();
   } catch (RepositoryException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
   }
 }
Exemplo n.º 22
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 public ValueLoader(String host, String port, String user, String pwd) {
   String connectionString = "jdbc:virtuoso://" + host + ':' + port;
   repository = new VirtuosoRepository(connectionString, user, pwd, true);
   try {
     RepositoryConnection con = repository.getConnection();
   } catch (RepositoryException e) {
     throw new IllegalArgumentException(e.getMessage(), e);
   }
 }
Exemplo n.º 23
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  @Override
  public void initialize() throws Exception {
    log.info("Performing Sesame Initialization...");

    sailRepo = SesameRepositoryLoader.loadRepositories(report);
    if (!Config.getConfig().isFill()) conn = sailRepo.getConnection();

    log.info("Sesame Repository successfully initialized.");
  }
Exemplo n.º 24
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  @Before
  public void setUp() throws Exception {
    repository = new SailRepository(new MemoryStore());
    repository.initialize();

    ObjectRepositoryFactory factory = new ObjectRepositoryFactory();
    ObjectRepository objectRepository = factory.createRepository(repository);
    connection = objectRepository.getConnection();
  }
  /**
   * Compares the models of the default context of two repositories and returns true if rep1 is a
   * subset of rep2. Note that the method pulls the entire default context of both repositories into
   * main memory. Use with caution.
   */
  public static boolean isSubset(Repository rep1, Repository rep2) throws RepositoryException {
    Set<Statement> model1, model2;

    RepositoryConnection con1 = rep1.getConnection();
    try {
      model1 = Iterations.asSet(con1.getStatements(null, null, null, true));
    } finally {
      con1.close();
    }

    RepositoryConnection con2 = rep2.getConnection();
    try {
      model2 = Iterations.asSet(con2.getStatements(null, null, null, true));
    } finally {
      con2.close();
    }

    return ModelUtil.isSubset(model1, model2);
  }
Exemplo n.º 26
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  /**
   * Evaluates the SPARQL SELECT query from the specified query pair on the repository.
   *
   * @param query Query pair.
   * @return Query result set.
   * @throws RepositoryException If no connection could be established, or connection fails.
   * @throws MalformedQueryException On query-related errors.
   * @throws QueryEvaluationException On query-related errors.
   */
  public SparqlResultSet query(QueryPair query)
      throws RepositoryException, MalformedQueryException, QueryEvaluationException {
    RepositoryConnection conn = repo.getConnection();
    TupleQuery tq = conn.prepareTupleQuery(QueryLanguage.SPARQL, query.getSparqlQuery());
    SparqlResultSet ret =
        new SparqlResultSet(tq.evaluate(), query.getName(), query.getSparqlEntityIdVariables());
    conn.close();

    return ret;
  }
Exemplo n.º 27
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 public RepositoryConnection getConnection() {
   if (this.connection.get() == null) {
     try {
       this.connection.set(repository.getConnection());
       this.connection.get().setAutoCommit(false);
     } catch (RepositoryException e) {
       throw new IllegalStateException(e);
     }
   }
   return connection.get();
 }
  /**
   * Compares two models defined by the default context of two repositories and returns the
   * difference between the first and the second model (that is, all statements that are present in
   * rep1 but not in rep2). Blank node IDs are not relevant for model equality, they are mapped from
   * one model to the other by using the attached properties. Note that the method pulls the entire
   * default context of both repositories into main memory. Use with caution.
   *
   * <p><b>NOTE: this algorithm is currently broken; it doesn't actually map blank nodes between the
   * two models.</b>
   *
   * @return The collection of statements that is the difference between rep1 and rep2.
   */
  public static Collection<? extends Statement> difference(Repository rep1, Repository rep2)
      throws RepositoryException {
    Collection<Statement> model1 = new HashSet<Statement>();
    Collection<Statement> model2 = new HashSet<Statement>();

    RepositoryConnection con1 = rep1.getConnection();
    try {
      Iterations.addAll(con1.getStatements(null, null, null, false), model1);
    } finally {
      con1.close();
    }

    RepositoryConnection con2 = rep2.getConnection();
    try {
      Iterations.addAll(con2.getStatements(null, null, null, false), model2);
    } finally {
      con2.close();
    }

    return difference(model1, model2);
  }
Exemplo n.º 29
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 /**
  * Import RDF data from a file
  *
  * @param location of file (/path/file) with RDF data
  * @param format RDF format of the string (used to select parser)
  */
 public void addFile(String filepath, RDFFormat format) {
   try {
     RepositoryConnection con = currentRepository.getConnection();
     try {
       con.add(new File(filepath), "", format);
     } finally {
       con.close();
     }
   } catch (Exception e) {
     e.printStackTrace();
   }
 }
Exemplo n.º 30
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  /**
   * Runs a SPARQL UPDATE query as specified.
   *
   * @param sparqlString Query string.
   * @throws RepositoryException
   * @throws MalformedQueryException
   * @throws QueryEvaluationException
   * @throws UpdateExecutionException
   */
  public void plainSparqlUpdate(String sparqlString)
      throws RepositoryException, MalformedQueryException, QueryEvaluationException,
          UpdateExecutionException {

    RepositoryConnection conn = repo.getConnection();

    Update query = conn.prepareUpdate(QueryLanguage.SPARQL, sparqlString);

    query.execute();

    conn.close();
  }