I'd like to traverse all the nodes within a specific depth using traversal
framework.
The start node (userNode) is uo.
TraversalDescription friendsTraversal = graphDb.traversalDescription()
.evaluator(Evaluators.excludeStartPosition())
.evaluator(Evaluators.toDepth(4))
.depthFirst()
.relationships(DynamicRelationshipType.withName("KNOWS"))
.uniqueness(Uniqueness.RELATIONSHIP_GLOBAL);
for (Node currentNode : friendsTraversal.traverse(userNode).nodes())
// userNode: uo
traversedNodes += currentNode.getProperty("name") + " ";
System.out.println(String.format("%s [TRAVERSES, depth %d] %s",
userNodeName, depth, traversedNodes));
The result is as follows.
uo [TRAVERSES, depth 4] uu ux GG uo QP QQ QA
Question 1. How come uo is included in the traversed nodes in spite of
excluding the start position by calling
evaluator(Evaluators.excludeStartPosition()).
Question 2. How come KX is not included in the traversed nodes though it's
4 depths away from the uo node.
My expected nodes traversed are { uu, ux, QP, GG, QQ, KX }.
The node topology is shown below. The blue edges are KNOWS edges.
<https://lh4.googleusercontent.com/-Thm847nTmVE/U8fcNrB6HBI/AAAAAAAABw8/WrY_ZM5P-JQ/s1600/image2013-12-18+10-55-30.png>
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