Examples of com.hp.hpl.jena.sparql.engine.QueryIterator

com.hp.hpl.jena.sparql.engine.QueryIterator
Root of query iterators in ARQ.

        return new QueryIterPath(opPath.getTriplePath(), input, execCxt) ;
    }


    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) ;
    }

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    }


    protected QueryIterator execute(OpPropFunc opPropFunc, QueryIterator input) {
        Procedure procedure = ProcEval.build(opPropFunc.getProperty(), opPropFunc.getSubjectArgs(),
                                             opPropFunc.getObjectArgs(), execCxt) ;
        QueryIterator qIter = exec(opPropFunc.getSubOp(), input) ;
        return new QueryIterProcedure(qIter, procedure, execCxt) ;
    }

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        // the results.


        if (false) {
            // If needed, applies to OpDiff and OpLeftJoin as well.
            List<Binding> a = all(input) ;
            QueryIterator qIter1 = new QueryIterPlainWrapper(a.iterator(), execCxt) ;
            QueryIterator qIter2 = new QueryIterPlainWrapper(a.iterator(), execCxt) ;


            QueryIterator left = exec(opJoin.getLeft(), qIter1) ;
            QueryIterator right = exec(opJoin.getRight(), qIter2) ;
            QueryIterator qIter = new QueryIterJoin(left, right, execCxt) ;
            return qIter ;
        }
        QueryIterator left = exec(opJoin.getLeft(), input) ;
        QueryIterator right = exec(opJoin.getRight(), root()) ;
        QueryIterator qIter = new QueryIterJoin(left, right, execCxt) ;
        return qIter ;
    }

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        return qIter ;
    }


    // Pass iterator from one step directly into the next.
    protected QueryIterator execute(OpSequence opSequence, QueryIterator input) {
        QueryIterator qIter = input ;


        for (Iterator<Op> iter = opSequence.iterator(); iter.hasNext();) {
            Op sub = iter.next() ;
            qIter = exec(sub, qIter) ;
        }

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        }
        return qIter ;
    }


    protected QueryIterator execute(OpLeftJoin opLeftJoin, QueryIterator input) {
        QueryIterator left = exec(opLeftJoin.getLeft(), input) ;
        QueryIterator right = exec(opLeftJoin.getRight(), root()) ;
        QueryIterator qIter = new QueryIterLeftJoin(left, right, opLeftJoin.getExprs(), execCxt) ;
        return qIter ;
    }

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        QueryIterator qIter = new QueryIterLeftJoin(left, right, opLeftJoin.getExprs(), execCxt) ;
        return qIter ;
    }


    protected QueryIterator execute(OpConditional opCondition, QueryIterator input) {
        QueryIterator left = exec(opCondition.getLeft(), input) ;
        QueryIterator qIter = new QueryIterOptionalIndex(left, opCondition.getRight(), execCxt) ;
        return qIter ;
    }

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        QueryIterator qIter = new QueryIterOptionalIndex(left, opCondition.getRight(), execCxt) ;
        return qIter ;
    }


    protected QueryIterator execute(OpDiff opDiff, QueryIterator input) {
        QueryIterator left = exec(opDiff.getLeft(), input) ;
        QueryIterator right = exec(opDiff.getRight(), root()) ;
        return new QueryIterDiff(left, right, execCxt) ;
    }

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    protected QueryIterator execute(OpMinus opMinus, QueryIterator input) {
        Op lhsOp = opMinus.getLeft() ;
        Op rhsOp = opMinus.getRight() ;


        QueryIterator left = exec(lhsOp, input) ;
        QueryIterator right = exec(rhsOp, root()) ;


        Set<Var> commonVars = OpVars.visibleVars(lhsOp) ;
        commonVars.retainAll(OpVars.visibleVars(rhsOp)) ;


        return new QueryIterMinus(left, right, commonVars, execCxt) ;

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        return new QueryIterMinus(left, right, commonVars, execCxt) ;
    }


    protected QueryIterator execute(OpDisjunction opDisjunction, QueryIterator input) {
        QueryIterator cIter = new QueryIterUnion(input, opDisjunction.getElements(), execCxt) ;
        return cIter ;
    }

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        return cIter ;
    }


    protected QueryIterator execute(OpUnion opUnion, QueryIterator input) {
        List<Op> x = flattenUnion(opUnion) ;
        QueryIterator cIter = new QueryIterUnion(input, x, execCxt) ;
        return cIter ;
    }

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