Hi,
I don't quite understand what you are trying to accomplish (attention span of a
tootsie fly), but here are some notes:
1. Look at AbstractStep.prepareTraveserForNextStep()
2. B_O_…Traverser specify the requirements that the Traverser satisfies:
B_O_P_S_SE_SL_Traverser =
Bulk+Object+Path+Sack+SideEffect+SingleLoop. In other words, a very meaty
traverser, indeed.
What do you want "// What to do?" to do?
Marko.
http://markorodriguez.com
On Jul 1, 2015, at 11:32 AM, pieter-gmail <[email protected]> wrote:
> Hi,
>
> I am trying to optimize queries with 'as' in it.
>
> Currently I can optimize consecutive VertexStep and EdgeVertexStep
> (without labels) by combining them into one step.
>
> Now I am trying to achieve the same but with 'as' in the traversal.
>
> e.g.
>
> Vertex a1 = g.addVertex(T.label, "A", "name", "a1");
> Vertex b1 = g.addVertex(T.label, "B", "name", "b1");
> Vertex b2 = g.addVertex(T.label, "B", "name", "b2");
> Edge e1 = a1.addEdge("outB", b1);
> Edge e2 = a1.addEdge("outB", b2);
>
> g.tx().commit();
>
> GraphTraversal<Vertex, Map<String, Element>> traversal = g.traversal()
> .V(a1)
> .outE("outB")
> .as("e")
> .inV()
> .as("B")
> .select("e", "B");
>
> I combine all consecutive VertexStep, EdgeVertexStep into one step,
> execute one query and with the result I can construct the labeled edge
> ("e") and vertices ("B").
>
> So far in the combined step I have all the information, but alas what now?
>
> public class SqlgVertexStepCompiled<S extends SqlgElement, E extends
> SqlgElement> extends FlatMapStep<S, E> {
>
> ...
>
> @Override
> protected Traverser<E> processNextStart() {
> while (true) {
> if (this.iterator.hasNext()) {
> Pair<E, Map<String, Object>> next = this.iterator.next();
> E e = next.getLeft();
> Map<String, Object> labeledObjects = next.getRight();
> for (String label : labeledObjects.keySet()) {
> //What to do
> this.head.path().extend(labeledObjects.get(label), label);
> }
> return this.head.split(e, this);
> } else {
> this.head = this.starts.next();
> this.iterator = this.flatMapCustom(this.head);
> }
> }
> }
>
> ...
>
> Any pointers?
>
> btw, what does all those strange traverser names mean,
> B_O_P_S_SE_SL_Traverser...
>
> Thanks
> Pieter
