private TraversalDescription traversalDescription(GraphDatabaseService db) {
return db.traversalDescription()
.breadthFirst()
.uniqueness(NODE_GLOBAL)
.relationships(withName("FRIEND"))
.evaluator(
new Evaluator() {
@Override
public Evaluation evaluate(Path path) {
if (path.length() == 4) {
return Evaluation.INCLUDE_AND_PRUNE;
}
return Evaluation.EXCLUDE_AND_CONTINUE;
}
});
}
public Iterable<Node> getFriends(String name) {
ResourceIterable<Node> users = db.findNodesByLabelAndProperty(USER, "name", name);
Node startNode = IteratorUtil.single(users);
return traversalDescription.traverse(startNode).nodes();
}