Examples with TableUnit org.apache.jena.sparql.algebra.table.TableUnit used on opensource projects

Example 1 with TableUnit

use of org.apache.jena.sparql.algebra.table.TableUnit in project jena by apache.

the class Eval method evalDS.

static Table evalDS(OpDatasetNames opDSN, Evaluator evaluator) {
    Node graphNode = opDSN.getGraphNode();
    if (graphNode.isURI()) {
        if (evaluator.getExecContext().getDataset().containsGraph(graphNode)) {
            return new TableUnit();
        } else // WRONG
        {
            return new TableEmpty();
        }
    }
    if (!Var.isVar(graphNode))
        throw new ARQInternalErrorException("OpDatasetNames: Not a URI or variable: " + graphNode);
    DatasetGraph dsg = evaluator.getExecContext().getDataset();
    Iterator<Node> iter = dsg.listGraphNodes();
    List<Binding> list = new ArrayList<>((int) dsg.size());
    for (; iter.hasNext(); ) {
        Node gn = iter.next();
        Binding b = BindingFactory.binding(Var.alloc(graphNode), gn);
        list.add(b);
    }
    QueryIterator qIter = new QueryIterPlainWrapper(list.iterator(), evaluator.getExecContext());
    return TableFactory.create(qIter);
}