Examples with QueryIterator org.apache.jena.sparql.engine.QueryIterator used on opensource projects

Example 71 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class TestDistinctDataBagLimited method createQueryIter.

@Override
protected QueryIterator createQueryIter(List<Binding> data) {
    QueryIterator qIter = new QueryIterPlainWrapper(data.iterator());
    Context cxt = new Context();
    cxt.set(ARQ.spillToDiskThreshold, 2L);
    return new QueryIterDistinct(qIter, new ExecutionContext(cxt, null, null, null));
}

Example 72 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class TestTableJoin method test.

private void test(Table left, Table right, boolean normalJoin, ExprList exprs, Table expected) {
    ExecutionContext execCxt = new ExecutionContext(ARQ.getContext(), null, null, null);
    QueryIterator leftIter = left.iterator(execCxt);
    QueryIterator qIter = normalJoin ? TableJoin.join(leftIter, right, exprs, execCxt) : TableJoin.leftJoin(leftIter, right, exprs, execCxt);
    // Order issues
    Set<String> vars1 = new HashSet<>();
    vars1.addAll(left.getVarNames());
    vars1.addAll(right.getVarNames());
    TableN results = new TableN(qIter);
    boolean b = TableCompare.equalsByTerm(expected, results);
    if (!b) {
        System.out.println("** Expected");
        System.out.println(expected);
        System.out.println("** Actual");
        System.out.println(results);
    }
    assertTrue(b);
}

Example 73 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class QueryEngineTDB method eval.

@Override
public QueryIterator eval(Op op, DatasetGraph dsg, Binding input, Context context) {
    // Fix DatasetGraph for global union.
    if (context.isTrue(TDB.symUnionDefaultGraph) && !doingDynamicDatasetBySpecialDataset) {
        op = A2.unionDefaultGraphQuads(op);
        Explain.explain("REWRITE(Union default graph)", op, context);
    }
    QueryIterator results = super.eval(op, dsg, input, context);
    results = new QueryIteratorMaterializeBinding(results);
    return results;
}

Example 74 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class LibSDB method findTriples.

/** Find triples, in the default graph or a named graph. */
public static Iterator<Triple> findTriples(DatasetGraph dsg, Node g, Node s, Node p, Node o) {
    if (Var.isVar(g))
        throw new InternalErrorException("Graph node is a variable : " + g);
    final Node vs = varOrConst(s, "s");
    final Node vp = varOrConst(p, "p");
    final Node vo = varOrConst(o, "o");
    // Evaluate as an algebra expression
    Triple triple = new Triple(vs, vp, vo);
    BasicPattern pattern = new BasicPattern();
    pattern.add(triple);
    Op op = (g != null) ? new OpQuadPattern(g, pattern) : new OpBGP(pattern);
    Plan plan = QueryEngineSDB.getFactory().create(op, dsg, BindingRoot.create(), null);
    QueryIterator qIter = plan.iterator();
    Iterator<Binding> iter;
    if (SDB.getContext().isTrue(SDB.streamGraphAPI)) {
        // Assumes iterator closed properly.
        iter = qIter;
    } else {
        // ---- Safe version: 
        List<Binding> x = Iter.toList(qIter);
        Iterator<Binding> qIter2 = x.iterator();
        qIter.close();
        iter = qIter2;
    }
    return Iter.map(iter, (b) -> bindingToTriple(vs, vp, vo, b));
}

Example 75 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class LibSDB method findInQuads.

/** Match a quad pattern (not triples in the default graph) */
public static Iterator<Quad> findInQuads(DatasetGraph dsg, Node g, Node s, Node p, Node o) {
    // If null, create and remember a variable, else use the node.
    final Node vg = varOrConst(g, "g");
    final Node vs = varOrConst(s, "s");
    final Node vp = varOrConst(p, "p");
    final Node vo = varOrConst(o, "o");
    Triple triple = new Triple(vs, vp, vo);
    // Evaluate as an algebra expression
    BasicPattern pattern = new BasicPattern();
    pattern.add(triple);
    Op op = new OpQuadPattern(vg, pattern);
    Plan plan = QueryEngineSDB.getFactory().create(op, dsg, BindingRoot.create(), null);
    QueryIterator qIter = plan.iterator();
    Iterator<Binding> iter;
    if (SDB.getContext().isTrue(SDB.streamGraphAPI)) {
        iter = qIter;
    } else {
        // ---- Safe version: 
        List<Binding> x = Iter.toList(qIter);
        Iterator<Binding> qIter2 = x.iterator();
        qIter.close();
        iter = qIter2;
    }
    return Iter.map(iter, (b) -> bindingToQuad(vg, vs, vp, vo, b));
}