public Collection<V> getSuccessors(GDirectedGraph<V, E> graph, V v) {
		if (isTopDown) {
			return graph.getSuccessors(v);
		}
		return graph.getPredecessors(v);
	}
Gets all child vertices of the given vertex, depending upon the direction of the 
navigator.

@param graph the graph
@param v the vertex 
@return the vertices
Ghidra/Framework/Graph/src/main/java/ghidra/graph/algo/GraphNavigator.java