转换 GraphTraversal <vertex, map<object, list> &gt; 进入Java8 stream</vertex,>

Question

I have a result of a query to graphDB which returns GraphTraversal<Vertex, Map<Object, List>> values . By using the default methods values.iterate().toStream() it should return a Stream of Stream<Map<Object, List>> which I can handle as Java8 stream, but for some reason, it does not work, repeat, by using the default methods from gemlin API to get the stream.

Note: By using a while I can iterate over it, that's fine, but I need to do some more complex operations that will be simplified by using Java8 Streams , but, as I said, is not working, even using tinkerpop default methods. Any idea?

There are no errors, but the stream is empty for some reason.

Answer 1

When you call iterate() it returns a GraphTraversal and you can then call toStream() on that, but it will always be empty. You should omit the iterate() if you intend to return values to your Stream . In short, simply do values().toStream() .