Package org.openrdf.query.parser.sparql

Examples of org.openrdf.query.parser.sparql.SPARQLParser

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     * @throws RuntimeException if an error occurs in the SPARQL query engine
     */
    public List<Map<String, Vertex>> executeSparql(String sparqlQuery) throws RuntimeException {
        try {
            sparqlQuery = getPrefixes() + sparqlQuery;
            final SPARQLParser parser = new SPARQLParser();
            final ParsedQuery query = parser.parseQuery(sparqlQuery, null);
            boolean includeInferred = false;
            final CloseableIteration<? extends BindingSet, QueryEvaluationException> results = this.sailConnection.get().evaluate(query.getTupleExpr(), query.getDataset(), new MapBindingSet(), includeInferred);
            final List<Map<String, Vertex>> returnList = new ArrayList<Map<String, Vertex>>();
            try {
                while (results.hasNext()) {
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                "   ?e2 pgm:tail ?friend.\n" +
                "   ?e2 pgm:head ?project.\n" +
                "   ?project prop:name ?name.\n" +
                "}";
        System.out.println(queryStr);
        ParsedQuery query = new SPARQLParser().parseQuery(queryStr, "http://example.org/bogus/");
        CloseableIteration<? extends BindingSet, QueryEvaluationException> results
                = sc.evaluate(query.getTupleExpr(), query.getDataset(), new EmptyBindingSet(), false);
        try {
            count = 0;
            while (results.hasNext()) {
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            URI uriC = sail.getValueFactory().createURI("http://example.org/uriC");
            sc.addStatement(uriA, uriB, uriC);
            sc.commit();
            sc.begin();

            SPARQLParser parser = new SPARQLParser();
            BindingSet bindings = new EmptyBindingSet();
            String baseURI = "http://example.org/bogus/";
            String queryStr;
            ParsedQuery query;
            CloseableIteration<? extends BindingSet, QueryEvaluationException> results;
            int count;
            // s ?p ?o SELECT
            queryStr = "SELECT ?y ?z WHERE { <http://example.org/uriA> ?y ?z }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI y = (URI) set.getValue("y");
                Value z = (Value) set.getValue("z");
                assertNotNull(y);
                assertNotNull(z);
                // System.out.println("y = " + y + ", z = " + z);
            }
            results.close();
            assertTrue(count > 0);

            // s p ?o SELECT using a namespace prefix
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "SELECT ?z WHERE { <" + prefix + "thor> foaf:name ?z }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            languages = new HashSet<String>();
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                Literal z = (Literal) set.getValue("z");
                assertNotNull(z);
                languages.add(z.getLanguage());
            }
            results.close();
            assertTrue(count > 0);
            assertEquals(2, languages.size());
            assertTrue(languages.contains("en"));
            assertTrue(languages.contains("is"));

            // ?s p o SELECT using a plain literal value with no language tag
            queryStr = "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>\n" + "SELECT ?s WHERE { ?s rdfs:comment \"he really knows where his towel is\" }";
            URI fordUri = sail.getValueFactory().createURI(prefix + "ford");
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI s = (URI) set.getValue("s");
                assertNotNull(s);
                assertEquals(s, fordUri);
            }
            results.close();
            assertTrue(count > 0);

            // ?s p o SELECT using a language-specific literal value
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "SELECT ?s WHERE { ?s foaf:name \"Thor\"@en }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI s = (URI) set.getValue("s");
                assertNotNull(s);
                assertEquals(s, thorUri);
            }
            results.close();
            assertTrue(count > 0);

            // The language tag is necessary
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "SELECT ?s WHERE { ?s foaf:name \"Thor\" }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                results.next();
            }
            results.close();
            assertEquals(0, count);

            // ?s p o SELECT using a typed literal value
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>\n" + "SELECT ?s WHERE { ?s foaf:msnChatID \"Thorster123\"^^xsd:string }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI s = (URI) set.getValue("s");
                assertNotNull(s);
                assertEquals(s, thorUri);
            }
            results.close();
            assertTrue(count > 0);

            // The data type is necessary
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>\n" + "SELECT ?s WHERE { ?s foaf:msnChatID \"Thorster123\" }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                results.next();
            }
            results.close();
            assertEquals(0, count);

            // s ?p o SELECT
            // TODO: commented out languages for now
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>\n" + "SELECT ?p WHERE { <" + prefix + "thor> ?p \"Thor\"@en }";
            query = parser.parseQuery(queryStr, baseURI);
            URI foafNameUri = sail.getValueFactory().createURI("http://xmlns.com/foaf/0.1/name");
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                URI p = (URI) set.getValue("p");
                assertNotNull(p);
                assertEquals(p, foafNameUri);
            }
            results.close();
            assertTrue(count > 0);

            // context-specific SELECT
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "SELECT ?z\n" + "FROM <" + prefix + "ctx1>\n" + "WHERE { <" + prefix + "thor> foaf:name ?z }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            languages = new HashSet<String>();
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
                Literal z = (Literal) set.getValue("z");
                assertNotNull(z);
                languages.add(z.getLanguage());
            }
            results.close();
            assertTrue(count > 0);
            assertEquals(2, languages.size());
            assertTrue(languages.contains("en"));
            assertTrue(languages.contains("is"));
            queryStr = "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" + "SELECT ?z\n" + "FROM <http://example.org/emptycontext>\n" + "WHERE { <" + prefix + "thor> foaf:name ?z }";
            query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                results.next();
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        }
    }

    @Test
    public void testJoins() throws Exception {
        SPARQLParser parser = new SPARQLParser();
        BindingSet bindings = new EmptyBindingSet();
        String baseURI = "http://example.org/bogus/";

        SailConnection sc = sail.getConnection();
        try {
            CloseableIteration<? extends BindingSet, QueryEvaluationException> results;
            int count;
            String queryStr = "PREFIX : <urn:com.tinkerpop.blueprints.pgm.oupls.sail.test/>\n" +
                    "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" +
                    "SELECT ?foaf WHERE {\n" +
                    "    :ford foaf:knows ?friend .\n" +
                    "    ?friend foaf:knows ?foaf .\n" +
                    "}";
            ParsedQuery query = parser.parseQuery(queryStr, baseURI);
            results = sc.evaluate(query.getTupleExpr(), query.getDataset(), bindings, false);
            count = 0;
            while (results.hasNext()) {
                count++;
                BindingSet set = results.next();
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                    }
                } finally {
                    results.close();
                }

                SPARQLParser parser = new SPARQLParser();
                CloseableIteration<? extends BindingSet, QueryEvaluationException> sparqlResults;
                String queryString = "SELECT ?x ?y WHERE { ?x <http://tinkerpop.com#knows> ?y }";
                ParsedQuery query = parser.parseQuery(queryString, "http://tinkerPop.com");

                System.out.println("\nSPARQL: " + queryString);
                sparqlResults = sc.evaluate(query.getTupleExpr(), query.getDataset(), new EmptyBindingSet(), false);
                try {
                    while (sparqlResults.hasNext()) {
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            out.close();
        }
    }

    private static ParsedQuery parseQuery(final String query) throws MalformedQueryException {
        SPARQLParser parser = new SPARQLParser();
        String baseURI = "http://example.org/bogusBaseURI/";
        return parser.parseQuery(query, baseURI);
    }
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    public CloseableIteration<? extends BindingSet, QueryEvaluationException> evaluate(final String query)
            throws RippleException {
        ensureOpen();

        SPARQLParser parser = new SPARQLParser();

        boolean useInference = false;
        // FIXME
        String baseURI = "http://example.org/bogusBaseURI/";

        ParsedQuery pq;
        try {
            pq = parser.parseQuery(query, baseURI);
        } catch (MalformedQueryException e) {
            throw new RippleException(e);
        }

        MapBindingSet bindings = new MapBindingSet();
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Related Classes of org.openrdf.query.parser.sparql.SPARQLParser

  • com.tinkerpop.blueprints.impls.sail.SailGraph
  • com.tinkerpop.blueprints.oupls.sail.GraphSailTest
  • com.tinkerpop.blueprints.oupls.sail.pg.PropertyGraphSailTest
  • com.tinkerpop.blueprints.oupls.sail.SailTest
  • edu.rpi.cs.datascience.EarthquakeTweets
  • net.fortytwo.ripple.model.impl.sesame.SesameModelConnection
  • org.openrdf.model.impl.ValueFactoryImpl
  • org.openrdf.query.algebra.QueryModel
  • org.openrdf.query.algebra.TupleExpr
  • org.openrdf.query.Dataset
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