Examples with QuerySolutionMap org.apache.jena.query.QuerySolutionMap used on opensource projects

Example 11 with QuerySolutionMap

use of org.apache.jena.query.QuerySolutionMap in project jena by apache.

the class TestAPI method testInitialBindings5.

/**
 * Initial binding substitution happens before optimization so initial bindings can make a semantically always false query into one that can return true
 */
@Test
public void testInitialBindings5() {
    // From JENA-500
    Query query = QueryFactory.create("ASK\n" + "WHERE {\n" + "    FILTER (?a = <http://constant>) .\n" + "}");
    // System.out.println(Algebra.optimize(Algebra.compile(query)).toString());
    Model model = ModelFactory.createDefaultModel();
    model.add(OWL.Thing, RDF.type, OWL.Class);
    QuerySolutionMap initialBinding = new QuerySolutionMap();
    initialBinding.add("a", ResourceFactory.createResource("http://constant"));
    try (QueryExecution qExec = QueryExecution.model(model).query(query).initialBinding(initialBinding).build()) {
        boolean result = qExec.execAsk();
        assertTrue(result);
    }
}

Example 12 with QuerySolutionMap

use of org.apache.jena.query.QuerySolutionMap in project rdf2neo by Rothamsted.

the class RdfDataManager method getCyNode.

/**
 * Uses the underlining TDB and mapping queries to create a new {@link CyNode} instance.
 *
 * @param nodeRes the RDF/Jena resource correspnding to the Cypher node. This provides the ?iri paramter in the queries below.
 * @param labelsSparql the node labels query, which is usually taken from {@link CyNodeLoadingHandler#getLabelsSparql()}.
 * @param propsSparql the node properties query, which is usually taken from {@link CyNodeLoadingHandler#getNodePropsSparql()}.
 */
public CyNode getCyNode(Resource nodeRes, String labelsSparql, String propsSparql) {
    ensureOpen();
    Model model = this.dataSet.getDefaultModel();
    QuerySolutionMap params = new QuerySolutionMap();
    params.add("iri", nodeRes);
    CyNode cyNode = new CyNode(nodeRes.getURI());
    // The node's labels
    if (labelsSparql != null) {
        // If it's omitted, it will get the default label.
        Query qry = this.queryCache.getUnchecked(labelsSparql);
        Function<String, String> labelIdConverter = this.getCyNodeLabelIdConverter();
        boolean wasInTnx = dataSet.isInTransaction();
        if (!wasInTnx)
            dataSet.begin(ReadWrite.READ);
        try {
            QueryExecution qx = QueryExecutionFactory.create(qry, model, params);
            qx.execSelect().forEachRemaining(row -> cyNode.addLabel(this.getCypherId(row.get("label"), labelIdConverter)));
        } finally {
            if (!wasInTnx && dataSet.isInTransaction())
                dataSet.end();
        }
    }
    // and the properties
    this.addCypherProps(cyNode, propsSparql);
    return cyNode;
}

Example 13 with QuerySolutionMap

use of org.apache.jena.query.QuerySolutionMap in project jena by apache.

the class TestAPI method testInitialBindingsConstruct2.

@Test
public void testInitialBindingsConstruct2() {
    QuerySolutionMap init = new QuerySolutionMap();
    init.add("o", m.createLiteral("x1"));
    String qs = "CONSTRUCT { ?s ?p ?o } WHERE { ?s ?p ?o }";
    try (QueryExecution qExec = QueryExecution.model(m).query(qs).initialBinding(init).build()) {
        Model r = qExec.execConstruct();
        assertTrue("Empty model", r.size() > 0);
        Property p1 = m.createProperty(ns + "p1");
        assertTrue("Empty model", r.contains(null, p1, init.get("x1")));
    }
}

Example 14 with QuerySolutionMap

use of org.apache.jena.query.QuerySolutionMap in project jena by apache.

the class TestAPI method testInitialBindings1.

@Test
public void testInitialBindings1() {
    QuerySolutionMap init = new QuerySolutionMap();
    init.add("o", m.createLiteral("y1"));
    String qs = "SELECT * {?s ?p ?o}";
    try (QueryExecution qExec = QueryExecution.model(m).query(qs).initialBinding(init).build()) {
        int count = queryAndCount(qExec);
        assertEquals("Initial binding didn't restrict query properly", 1, count);
    }
}

Example 15 with QuerySolutionMap

use of org.apache.jena.query.QuerySolutionMap in project jena by apache.

the class TestAPI method testInitialBindings2.

@Test
public void testInitialBindings2() {
    QuerySolutionMap init = new QuerySolutionMap();
    init.add("z", m.createLiteral("zzz"));
    String qs = "SELECT * {?s ?p ?o}";
    try (QueryExecution qExec = QueryExecution.model(m).query(qs).initialBinding(init).build()) {
        int count = queryAndCount(qExec);
        assertEquals("Initial binding restricted query improperly", 3, count);
    }
}