public V getEnd(E e) {
		if (isTopDown) {
			return e.getEnd();
		}
		return e.getStart();
	}
Gets the vertex at the end of the given edge, where the 'end' of the edge depends on the
start vertex.

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