src/main/java/org/jboss/util/graph/Vertex.java
public void addIncomingEdge(Vertex<T> from, int cost)
   {
      Edge<T> out = new Edge<T>(this, from, cost);
      incomingEdges.add(out);
   }
public void addIncomingEdge(Vertex<T> from, int cost)
   {
      Edge<T> out = new Edge<T>(this, from, cost);
      incomingEdges.add(out);
   }
Add an incoming edge starting at from

@param from - the starting vertex
@param cost the edge cost