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

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


    protected QueryIterator execute(OpFilter opFilter, QueryIterator input) {
        ExprList exprs = opFilter.getExprs() ;


        Op base = opFilter.getSubOp() ;
        QueryIterator qIter = exec(base, input) ;


        for (Expr expr : exprs)
            qIter = new QueryIterFilterExpr(qIter, expr, execCxt) ;
        return qIter ;
    }

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            return input ;
        if (input instanceof QueryIterRoot) {
            input.close() ;
            return opTable.getTable().iterator(execCxt) ;
        }
        QueryIterator qIterT = opTable.getTable().iterator(execCxt) ;
        QueryIterator qIter = new QueryIterJoin(input, qIterT, execCxt) ;
        return qIter ;
    }

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        return qIter ;
    }


    protected QueryIterator execute(OpExt opExt, QueryIterator input) {
        try {
            QueryIterator qIter = opExt.eval(input, execCxt) ;
            if (qIter != null)
                return qIter ;
        } catch (UnsupportedOperationException ex) {}
        // null or UnsupportedOperationException
        throw new QueryExecException("Encountered unsupported OpExt: " + opExt.getName()) ;

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    protected QueryIterator execute(OpList opList, QueryIterator input) {
        return exec(opList.getSubOp(), input) ;
    }


    protected QueryIterator execute(OpOrder opOrder, QueryIterator input) {
        QueryIterator qIter = exec(opOrder.getSubOp(), input) ;
        qIter = new QueryIterSort(qIter, opOrder.getConditions(), execCxt) ;
        return qIter ;
    }

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        qIter = new QueryIterSort(qIter, opOrder.getConditions(), execCxt) ;
        return qIter ;
    }


    protected QueryIterator execute(OpTopN opTop, QueryIterator input) {
        QueryIterator qIter = null ;
        // We could also do (reduced) here as well.
        // but it's detected in TransformTopN and turned into (distinct)
        // there so that code catches that already.
        // We leave this to do the strict case of (top (distinct ...))
        if (opTop.getSubOp() instanceof OpDistinct) {

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        // on the active graph.


        // More intelligent QueryIterProject needed.


        if (input instanceof QueryIterRoot) {
            QueryIterator qIter = exec(opProject.getSubOp(), input) ;
            qIter = new QueryIterProject(qIter, opProject.getVars(), execCxt) ;
            return qIter ;
        }
        // Nested projected : need to ensure the input is seen.
        QueryIterator qIter = new QueryIterProjectMerge(opProject, input, this, execCxt) ;
        return qIter ;
    }

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        QueryIterator qIter = new QueryIterProjectMerge(opProject, input, this, execCxt) ;
        return qIter ;
    }


    protected QueryIterator execute(OpSlice opSlice, QueryIterator input) {
        QueryIterator qIter = exec(opSlice.getSubOp(), input) ;
        qIter = new QueryIterSlice(qIter, opSlice.getStart(), opSlice.getLength(), execCxt) ;
        return qIter ;
    }

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        qIter = new QueryIterSlice(qIter, opSlice.getStart(), opSlice.getLength(), execCxt) ;
        return qIter ;
    }


    protected QueryIterator execute(OpGroup opGroup, QueryIterator input) {
        QueryIterator qIter = exec(opGroup.getSubOp(), input) ;
        qIter = new QueryIterGroup(qIter, opGroup.getGroupVars(), opGroup.getAggregators(), execCxt) ;
        return qIter ;
    }

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//        List<Node> x = Iter.toList(graphNameNodes) ;
//        graphNameNodes = x.iterator() ;
//        System.out.println(x) ;
        
        QueryIterator current = new QueryIterGraphInner(
                                               outerBinding, graphNameNodes, 
                                               opGraph, getExecContext()) ;
        return current ;
    }

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        qIter = new QueryIterGroup(qIter, opGroup.getGroupVars(), opGroup.getAggregators(), execCxt) ;
        return qIter ;
    }


    protected QueryIterator execute(OpDistinct opDistinct, QueryIterator input) {
        QueryIterator qIter = exec(opDistinct.getSubOp(), input) ;
        qIter = new QueryIterDistinct(qIter, execCxt) ;
        return qIter ;
    }

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