Examples with BNodeGenerator org.openrdf.query.algebra.BNodeGenerator used on opensource projects

Example 1 with BNodeGenerator

use of org.openrdf.query.algebra.BNodeGenerator in project incubator-rya by apache.

the class ConstructConsequentVisitor method recordConsequent.

private void recordConsequent(ProjectionElemList variables, List<ExtensionElem> extensionElements) {
    Map<String, Value> bindings = new ConcurrentHashMap<>();
    Map<String, Value> values = new ConcurrentHashMap<>();
    Set<String> queryBnodes = new HashSet<>();
    Set<String> projectedBnodes = new HashSet<>();
    for (ExtensionElem ee : extensionElements) {
        if (ee.getExpr() instanceof ValueConstant) {
            bindings.put(ee.getName(), ((ValueConstant) ee.getExpr()).getValue());
        } else if (ee.getExpr() instanceof BNodeGenerator) {
            queryBnodes.add(ee.getName());
        }
    }
    for (ProjectionElem var : variables.getElements()) {
        String sourceName = var.getSourceName();
        String targetName = var.getTargetName();
        Value constValue = bindings.get(sourceName);
        if (constValue != null) {
            values.put(targetName, constValue);
        } else if (queryBnodes.contains(sourceName)) {
            projectedBnodes.add(targetName);
        }
    }
    Var subjVar = new Var(SUBJECT_VAR_NAME, values.get(SUBJECT_VAR_NAME));
    Var predVar = new Var(PREDICATE_VAR_NAME, values.get(PREDICATE_VAR_NAME));
    Var objVar = new Var(OBJECT_VAR_NAME, values.get(OBJECT_VAR_NAME));
    subjVar.setAnonymous(projectedBnodes.contains(SUBJECT_VAR_NAME));
    predVar.setAnonymous(projectedBnodes.contains(PREDICATE_VAR_NAME));
    objVar.setAnonymous(projectedBnodes.contains(OBJECT_VAR_NAME));
    StatementPattern sp = new StatementPattern(subjVar, predVar, objVar);
    consequentStatementPatterns.add(sp);
}

Example 2 with BNodeGenerator

use of org.openrdf.query.algebra.BNodeGenerator in project incubator-rya by apache.

the class MultiProjectionEvaluator method make.

/**
 * Make a {@link MultiProjectionEvaluator} that processes the logic of a {@link MultiProjection}.
 *
 * @param multiProjection - Defines the projections that will be processed. (not null)
 * @param bNodeIdFactory - Creates the IDs for Blank Nodes. (not null)
 * @return A {@link MultiProjectionEvaluator} for the provided {@link MultiProjection}.
 */
public static MultiProjectionEvaluator make(final MultiProjection multiProjection, final BNodeIdFactory bNodeIdFactory) {
    requireNonNull(multiProjection);
    // Figure out if there are extensions.
    final TupleExpr arg = multiProjection.getArg();
    final Optional<Extension> extension = (arg instanceof Extension) ? Optional.of((Extension) arg) : Optional.empty();
    // If there are, iterate through them and find any blank node source names.
    final Set<String> blankNodeSourceNames = new HashSet<>();
    if (extension.isPresent()) {
        for (final ExtensionElem elem : extension.get().getElements()) {
            if (elem.getExpr() instanceof BNodeGenerator) {
                blankNodeSourceNames.add(elem.getName());
            }
        }
    }
    // Create a ProjectionEvaluator for each projection that is part of the multi.
    final Set<ProjectionEvaluator> projections = new HashSet<>();
    for (final ProjectionElemList projectionElemList : multiProjection.getProjections()) {
        projections.add(new ProjectionEvaluator(projectionElemList, extension));
    }
    return new MultiProjectionEvaluator(projections, blankNodeSourceNames, bNodeIdFactory);
}

Example 3 with BNodeGenerator

use of org.openrdf.query.algebra.BNodeGenerator in project incubator-rya by apache.

the class ConstructConsequentVisitorTest method testBNode.

@Test
public void testBNode() {
    Extension extension = new Extension(new SingletonSet(), new ExtensionElem(new Var("x"), "x"), new ExtensionElem(new BNodeGenerator(), "z"));
    Projection projection = new Projection(extension, new ProjectionElemList(new ProjectionElem("x", "subject"), new ProjectionElem("y", "predicate"), new ProjectionElem("z", "object")));
    ConstructConsequentVisitor visitor = new ConstructConsequentVisitor();
    projection.visit(visitor);
    Set<StatementPattern> expected = Sets.newHashSet(new StatementPattern(s(null), p(null), anon(o(null))));
    Assert.assertEquals(expected, visitor.getConsequents());
}