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

Example 51 with QueryIterator

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

the class OpExecutor method execute.

protected QueryIterator execute(OpProcedure opProc, QueryIterator input) {
    Procedure procedure = ProcEval.build(opProc, execCxt);
    QueryIterator qIter = exec(opProc.getSubOp(), input);
    // Delay until query starts executing.
    return new QueryIterProcedure(qIter, procedure, execCxt);
}

Example 52 with QueryIterator

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

the class QueryIterGraph method nextStage.

@Override
protected QueryIterator nextStage(Binding outerBinding) {
    DatasetGraph ds = getExecContext().getDataset();
    // Is this closed?
    Iterator<Node> graphNameNodes = makeSources(ds, outerBinding, opGraph.getNode());
    //        List<Node> x = Iter.toList(graphNameNodes) ;
    //        graphNameNodes = x.iterator() ;
    //        System.out.println(x) ;
    QueryIterator current = new QueryIterGraphInner(outerBinding, graphNameNodes, opGraph, getExecContext());
    return current;
}

Example 53 with QueryIterator

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

the class QueryIterService method nextStage.

@Override
protected QueryIterator nextStage(Binding outerBinding) {
    Op op = QC.substitute(opService, outerBinding);
    boolean silent = opService.getSilent();
    QueryIterator qIter;
    try {
        qIter = Service.exec((OpService) op, getExecContext().getContext());
        // This iterator is materialized already otherwise we may end up
        // not servicing the HTTP connection as needed.
        // In extremis, can cause a deadlock when SERVICE loops back to this server.
        // Add tracking.
        qIter = QueryIter.makeTracked(qIter, getExecContext());
    } catch (RuntimeException ex) {
        if (silent) {
            Log.warn(this, "SERVICE <" + opService.getService().toString() + ">: " + ex.getMessage());
            // Return the input
            return QueryIterSingleton.create(outerBinding, getExecContext());
        }
        throw ex;
    }
    // Need to put the outerBinding as parent to every binding of the service call.
    // There should be no variables in common because of the OpSubstitute.substitute 
    QueryIterator qIter2 = new QueryIterCommonParent(qIter, outerBinding, getExecContext());
    return qIter2;
}

Example 54 with QueryIterator

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

the class QueryIterUnion method nextStage.

@Override
protected QueryIterator nextStage(Binding binding) {
    QueryIterConcat unionQIter = new QueryIterConcat(getExecContext());
    for (Op subOp : subOps) {
        subOp = QC.substitute(subOp, binding);
        QueryIterator parent = QueryIterSingleton.create(binding, getExecContext());
        QueryIterator qIter = QC.execute(subOp, parent, getExecContext());
        unionQIter.add(qIter);
    }
    return unionQIter;
}

Example 55 with QueryIterator

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

the class EvaluatorSimple method slice.

@Override
public Table slice(Table table, long start, long length) {
    QueryIterator qIter = table.iterator(getExecContext());
    qIter = new QueryIterSlice(qIter, start, length, getExecContext());
    return new TableN(qIter);
}