code: public void addDirectedRoute(final LocalTrustGraphNode from, final LocalTrustGraphNode to) {
          from.getRoutingTable().addNeighbor(to.getId());
      }
docs: Add a directed trust graph link between two nodes.
  
  Note: Although this is useful for testing adverse conditions,
  relationships must be symmetric for the normal functioning of
  the algorithm.  An advertising node must trust another node to
  send to it, and that same node must trust the sender in order
  to forward the message (find the next hop for the message).
  
  @param from the node that is trusting
  @param to the node that is being trused by the node 'from'