// build the RoutingAlgorithm object using the data from the
// "ProgramInput" object (network, traffic matrix, selected
// algorithms). From the traffic matrix we find the commodities, 
// and we create a DAG for each such commodity in the routing
// table.

*operation* RoutingAlgorithm* build()
*wrapper* ProgramInput
  (@
     Node_List* nodelist;
     Network* net = get_network()->rebuild_network(nodelist);
     Ring* ring = net->create_ring();
     Commodity_List* commodities = get_traffic()->find_commodities(nodelist, ring);
     RoutingTable* rtable = commodities->build_routing_table(ring);
     return_val = new RoutingAlgorithm(net,
				       ring,
				       rtable,
				       get_init(),
				       get_prox(),
				       get_prob(),
				       get_flow(),
				       get_util(),
				       get_max_iter());
   @)