Java SPARQLParser类代码示例

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
public void run() throws MalformedQueryException, QueryEvaluationException, NotEnoughResultsException, SailException {
    CloseableIteration<? extends BindingSet, QueryEvaluationException> it = null;

    try {
        // Execute the query.
        final SPARQLParser sparqlParser = new SPARQLParser();
        final ParsedQuery parsedQuery = sparqlParser.parseQuery(sparql, null);
        it = sailConn.evaluate(parsedQuery.getTupleExpr(), null, null, false);

        // Perform the reads.
        if(numReads.isPresent()) {
            read(it, numReads.get() );
        } else {
            readAll(it);
        }
    } finally {
        if(it != null) {
            it.close();
        }
    }
}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
public void testStatementPatternContext() throws Exception {
        String query = "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>\n" +
                " PREFIX ub: <urn:lubm:rdfts#>\n" +
                "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>\n" +
                " SELECT * WHERE\n" +
                " {\n" +
                " GRAPH ub:g1 {\n" +
                "\t?x rdf:type ub:UndergraduateStudent\n" +
                " }\n" +
                " }\n" +
                "";
        QueryParser parser = new SPARQLParser();
        ParsedQuery parsedQuery = parser.parseQuery(query, null);

//        System.out.println(parsedQuery);

        SparqlToPigTransformVisitor visitor = new SparqlToPigTransformVisitor();
        visitor.setTablePrefix(tablePrefix);
        visitor.setInstance(instance);
        visitor.setZk(zk);
        visitor.setUser(user);
        visitor.setPassword(password);
        visitor.meet(new QueryRoot(parsedQuery.getTupleExpr()));
//        System.out.println(visitor.getPigScript());
    }
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
public void testJoin() throws Exception {
        String query = "select * where {\n" +
                "?subj <urn:lubm:rdfts#name> 'Department0'.\n" +
                "?subj <urn:lubm:rdfts#subOrganizationOf> <http://www.University0.edu>.\n" +
                "}";
//        System.out.println(query);
        QueryParser parser = new SPARQLParser();
        ParsedQuery parsedQuery = parser.parseQuery(query, null);

//        System.out.println(parsedQuery);

        SparqlToPigTransformVisitor visitor = new SparqlToPigTransformVisitor();
        visitor.setTablePrefix(tablePrefix);
        visitor.setInstance(instance);
        visitor.setZk(zk);
        visitor.setUser(user);
        visitor.setPassword(password);
        visitor.meet(new QueryRoot(parsedQuery.getTupleExpr()));
//        System.out.println(visitor.getPigScript());
    }
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
public void testMutliReturnJoin() throws Exception {
    String query = "select * where {\n" +
            "?subj <urn:lubm:rdfts#name> 'Department0'.\n" +
            "?subj <urn:lubm:rdfts#subOrganizationOf> ?suborg.\n" +
            "}";
    QueryParser parser = new SPARQLParser();
    ParsedQuery parsedQuery = parser.parseQuery(query, null);

    System.out.println(query);

    SparqlToPigTransformVisitor visitor = new SparqlToPigTransformVisitor();
    visitor.setTablePrefix(tablePrefix);
    visitor.setInstance(instance);
    visitor.setZk(zk);
    visitor.setUser(user);
    visitor.setPassword(password);
    visitor.meet(new QueryRoot(parsedQuery.getTupleExpr()));
    System.out.println(visitor.getPigScript());
}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
public void testMutlipleJoins() throws Exception {
        String query = "select * where {\n" +
                "?subj <urn:lubm:rdfts#name> 'Department0'.\n" +
                "?subj <urn:lubm:rdfts#subOrganizationOf> <http://www.University0.edu>.\n" +
                "?subj <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <urn:lubm:rdfts#Department>.\n" +
                "}";
//        System.out.println(query);
        QueryParser parser = new SPARQLParser();
        ParsedQuery parsedQuery = parser.parseQuery(query, null);

//        System.out.println(parsedQuery);

        SparqlToPigTransformVisitor visitor = new SparqlToPigTransformVisitor();
        visitor.setTablePrefix(tablePrefix);
        visitor.setInstance(instance);
        visitor.setZk(zk);
        visitor.setUser(user);
        visitor.setPassword(password);
        visitor.meet(new QueryRoot(parsedQuery.getTupleExpr()));
//        System.out.println(visitor.getPigScript());
    }
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
@Test
public void createSingleMongoMetadataNode() throws MalformedQueryException {

    MongoDBRdfConfiguration conf = (MongoDBRdfConfiguration) getConf(true);
    Set<RyaURI> propertySet = new HashSet<>();
    propertySet.add(new RyaURI("http://createdBy"));
    conf.setStatementMetadataProperties(propertySet);
    StatementMetadataExternalSetProvider metaProvider = new StatementMetadataExternalSetProvider(conf);
    SPARQLParser parser = new SPARQLParser();
    ParsedQuery pq = parser.parseQuery(query, null);

    List<QueryModelNode> patterns = new ArrayList<>();
    List<StatementMetadataNode<?>> expected = new ArrayList<>();
    Set<StatementPattern> sp = StatementMetadataTestUtils.getMetadataStatementPatterns(pq.getTupleExpr(), propertySet);

    patterns.addAll(StatementPatternCollector.process(pq.getTupleExpr()));
    JoinSegment<StatementMetadataNode<?>> segment = new JoinSegment<>(
            new HashSet<>(patterns), patterns, new HashMap<ValueExpr, Filter>());
    List<StatementMetadataNode<?>> extSets = metaProvider.getExternalSets(segment);

    expected.add(new StatementMetadataNode<>(sp,conf));

    Assert.assertEquals(expected, extSets);

}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
@Test
	public void testReOrderedBasicOptional() throws MalformedQueryException {

		String query = ""//
				+ "SELECT ?e ?c ?l" //
				+ "{" //
				+ "  ?e a ?c . "//
				+ "  OPTIONAL{?e <uri:talksTo> ?l } . "//
				+ "  ?e <http://www.w3.org/2000/01/rdf-schema#label> ?l "//
				+ "}";//

		SPARQLParser parser = new SPARQLParser();
		ParsedQuery pq = parser.parseQuery(query, null);
		System.out.println(pq.getTupleExpr());
		List<TupleExpr> joinArgs = getJoinArgs(pq.getTupleExpr(),
				new ArrayList<TupleExpr>());
//		System.out.println(joinArgs);
		FlattenedOptional optional = (FlattenedOptional) joinArgs.get(0);
		TupleExpr sp1 = joinArgs.get(1);
		TupleExpr sp2 = joinArgs.get(2);

		Assert.assertEquals(false, optional.canRemoveTuple(sp1));
		Assert.assertEquals(false, optional.canAddTuple(sp2));


	}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
@Test
public void testPeriodicNodePlacement() throws MalformedQueryException {
     String query = "prefix function: <http://org.apache.rya/function#> " //n
            + "prefix time: <http://www.w3.org/2006/time#> " //n
            + "prefix fn: <http://www.w3.org/2006/fn#> " //n
            + "select ?obs ?time ?lat where {" //n
            + "Filter(function:periodic(?time, 12.0, 6.0,time:hours)) " //n
            + "Filter(fn:test(?lat, 25)) " //n
            + "?obs <uri:hasTime> ?time. " //n
            + "?obs <uri:hasLattitude> ?lat }"; //n
     
     SPARQLParser parser = new SPARQLParser();
     ParsedQuery pq = parser.parseQuery(query, null);
     TupleExpr te = pq.getTupleExpr();
     te.visit(new PeriodicQueryNodeVisitor());
     
     PeriodicNodeCollector collector = new PeriodicNodeCollector();
     te.visit(collector);
     
     PeriodicQueryNode node2 = new PeriodicQueryNode(12*60*60*1000L, 6*3600*1000L, TimeUnit.MILLISECONDS, "time", new Join());

     Assert.assertEquals(true, periodicNodesEqualIgnoreArg(node2, collector.getPeriodicQueryNode()));
     
}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
@Test
public void testConstructGraph() throws MalformedQueryException, UnsupportedEncodingException {
    String query = "select ?x where { ?x <uri:talksTo> <uri:Bob>. ?y <uri:worksAt> ?z }";

    SPARQLParser parser = new SPARQLParser();
    ParsedQuery pq = parser.parseQuery(query, null);
    List<StatementPattern> patterns = StatementPatternCollector.process(pq.getTupleExpr());
    ConstructGraph graph = new ConstructGraph(patterns);

    QueryBindingSet bs = new QueryBindingSet();
    bs.addBinding("x", vf.createURI("uri:Joe"));
    bs.addBinding("y", vf.createURI("uri:Bob"));
    bs.addBinding("z", vf.createURI("uri:BurgerShack"));
    VisibilityBindingSet vBs = new VisibilityBindingSet(bs,"FOUO");
    Set<RyaStatement> statements = graph.createGraphFromBindingSet(vBs);
    
    RyaStatement statement1 = new RyaStatement(new RyaURI("uri:Joe"), new RyaURI("uri:talksTo"), new RyaURI("uri:Bob"));
    RyaStatement statement2 = new RyaStatement(new RyaURI("uri:Bob"), new RyaURI("uri:worksAt"), new RyaURI("uri:BurgerShack"));
    Set<RyaStatement> expected = Sets.newHashSet(Arrays.asList(statement1, statement2));
    expected.forEach(x-> x.setColumnVisibility("FOUO".getBytes()));
    ConstructGraphTestUtils.ryaStatementSetsEqualIgnoresTimestamp(expected, statements);
}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
private static TupleExpr makeUnchainedQuery(final BenchmarkParams params) throws MalformedQueryException {
    final Queue<String> varQueue= Lists.newLinkedList(variables);
    final SPARQLParser parser = new SPARQLParser();

    final List<String> queryVars = new ArrayList<>();

    // The first statement pattern has two variables.
    queryVars.add( varQueue.remove() );
    queryVars.add( varQueue.remove() );

    // The each extra statement pattern joins with the previous one, so only need one more variable each.
    for(int i = 1; i < params.getQuerySPCount(); i++) {
        queryVars.add( varQueue.remove() );
        queryVars.add( varQueue.remove() );
    }

    final String sparql = buildUnchainedSPARQL(queryVars);
    return parser.parseQuery(sparql, null).getTupleExpr();
}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
/**
    *
    * @param accCon
    *            - connection to a valid Accumulo instance
    * @param tablename
    *            - name of an existing PCJ table
    * @throws MalformedQueryException
    * @throws SailException
    * @throws QueryEvaluationException
    * @throws TableNotFoundException
    * @throws AccumuloSecurityException
    * @throws AccumuloException
    * @throws PCJStorageException
    */
public AccumuloIndexSet(final Configuration conf, final String tablename)
		throws MalformedQueryException, SailException,
                   QueryEvaluationException, TableNotFoundException, AccumuloException, AccumuloSecurityException, PCJStorageException {
       this.tablename = tablename;
	this.accCon = ConfigUtils.getConnector(conf);
	this.auths = getAuthorizations(conf);
       PcjMetadata meta = pcj.getPcjMetadata(accCon, tablename);
	final SPARQLParser sp = new SPARQLParser();
	final ParsedTupleQuery pq = (ParsedTupleQuery) sp.parseQuery(meta.getSparql(), null);

	setProjectionExpr((Projection) pq.getTupleExpr());
	final Set<VariableOrder> orders = meta.getVarOrders();

	varOrder = Lists.newArrayList();
	for (final VariableOrder var : orders) {
		varOrder.add(var.toString());
	}
	setLocalityGroups(tablename, accCon, varOrder);
	this.setSupportedVariableOrderMap(varOrder);
}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
/**
 * Creates a new {@link MongoPcjQueryNode}.
 *
 * @param sparql - sparql query whose results will be stored in PCJ document. (not empty of null)
 * @param pcjId - name of an existing PCJ. (not empty or null)
 * @param pcjDocs - {@link MongoPcjDocuments} used to maintain PCJs in mongo. (not null)
 *
 * @throws MalformedQueryException - The SPARQL query needs to contain a projection.
 */
public MongoPcjQueryNode(final String sparql, final String pcjId, final MongoPcjDocuments pcjDocs) throws MalformedQueryException {
    checkArgument(!Strings.isNullOrEmpty(sparql));
    checkArgument(!Strings.isNullOrEmpty(pcjId));
    this.pcjDocs = checkNotNull(pcjDocs);
    this.pcjId = pcjId;
    final SPARQLParser sp = new SPARQLParser();
    final ParsedTupleQuery pq = (ParsedTupleQuery) sp.parseQuery(sparql, null);
    final TupleExpr te = pq.getTupleExpr();
    Preconditions.checkArgument(PCJOptimizerUtilities.isPCJValid(te), "TupleExpr is an invalid PCJ.");

    final Optional<Projection> projection = new ParsedQueryUtil().findProjection(pq);
    if (!projection.isPresent()) {
        throw new MalformedQueryException("SPARQL query '" + sparql + "' does not contain a Projection.");
    }
    setProjectionExpr(projection.get());
}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
@Test
public void tupleReArrangeTest3() throws MalformedQueryException {

    String queryString = ""//
            + "SELECT ?a ?b ?c ?d ?e ?x ?y" //
            + "{" //
            + " Filter(?c = <uri:label2>)" //
            + " Filter(?x = <uri:somethingFunny>) "//
            + " ?e <uri:laughsAt> ?x ." //
            + " ?e <uri:livesIn> ?y . "//
            + "{ ?a a ?b .  ?a <http://www.w3.org/2000/01/rdf-schema#label> ?c  }"//
            + " UNION { ?a <uri:talksTo> ?d .  ?a <http://www.w3.org/2000/01/rdf-schema#label> ?e  }"//
            + "}";//

    SPARQLParser sp = new SPARQLParser();
    ParsedQuery pq = sp.parseQuery(queryString, null);
    List<TupleExpr> tuples = TupleReArranger.getTupleReOrderings(pq.getTupleExpr());

    Assert.assertEquals(24, tuples.size());

}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
@Test
public void tupleReArrangeTest4() throws MalformedQueryException {

    String queryString = ""//
            + "SELECT ?a ?b ?c ?d ?e ?x ?y" //
            + "{" //
            + " Filter(?c = <uri:label2>)" //
            + " Filter(?x = <uri:somethingFunny>) "//
            + " Filter(?d = <uri:Fred> ) " //
            + " ?e <uri:laughsAt> ?x ." //
            + " ?e <uri:livesIn> ?y . "//
            + "{ ?a a ?b .  ?a <http://www.w3.org/2000/01/rdf-schema#label> ?c  }"//
            + " UNION { ?a <uri:talksTo> ?d .  ?a <http://www.w3.org/2000/01/rdf-schema#label> ?e  }"//
            + "}";//

    SPARQLParser sp = new SPARQLParser();
    ParsedQuery pq = sp.parseQuery(queryString, null);
    TupleExpr te = pq.getTupleExpr();
    new FilterOptimizer().optimize(te, null, null);
    System.out.println(te);
    List<TupleExpr> tuples = TupleReArranger.getTupleReOrderings(te);
    System.out.println(tuples);

    Assert.assertEquals(24, tuples.size());

}
 

import org.openrdf.query.parser.sparql.SPARQLParser; //导入依赖的package包/类
@Test
public void testCost1() throws Exception {

	String q1 = ""//
			+ "SELECT ?f ?m ?d ?h ?i " //
			+ "{" //
			+ "  ?f a ?m ."//
			+ "  ?m <http://www.w3.org/2000/01/rdf-schema#label> ?d ."//
			+ "  ?d <uri:talksTo> ?f . "//
			+ "  ?d <uri:hangOutWith> ?f ." //
			+ "  ?f <uri:hangOutWith> ?h ." //
			+ "  ?f <uri:associatesWith> ?i ." //
			+ "  ?i <uri:associatesWith> ?h ." //
			+ "}";//

	SPARQLParser parser = new SPARQLParser();

	ParsedQuery pq1 = parser.parseQuery(q1, null);

	ThreshholdPlanSelector tps = new ThreshholdPlanSelector(
			pq1.getTupleExpr());
	double cost = tps.getCost(pq1.getTupleExpr(), .6, .4, 0);
	Assert.assertEquals(.7, cost, .01);

}