Search code examples
javatinkerpoptinkerpop3

Can I get a Vertex instead of an Element out of this GraphTraversal?

I am using Tinkerpop3 Gremlin against the reference TinkerGraph implementation.

I am attempting to .next() a Vertex out this Traversal:

graph.V().has(T.label, "link").has("url", url).next();

Unfortunately, I am only able to get an Element from next(). When I assign the output of next() into a Vertex, I get:

error: incompatible types: Element cannot be converted to Vertex

How can I get a Vertex?

I've looked at the docs and see that V() returns GraphTraversal<Vertex,Vertex>. The has() steps are signed default <E2 extends Element> GraphTraversal<S,E2>, which I thought would preserve the GraphTraveral<Vertex, Vertex> but next() yields only Element. Not sure what to do next.

Thank you.

Solution

  • Well - you could always do this:

    Vertex v = g.V().has(T.label, "link").<Vertex>has("name", url).next();

    and simply explicitly type the last step.