public Edge addUndirectionalEdge(Edge e)
{
Vertex origin = e.getOrigin();
Vertex destination = e.getDestination();
origin.addOutEdge(e);
destination.addOutEdge(e);
origin.addInEdge(e);
destination.addInEdge(e);
//Add, if missing vertices
if (!vertices.ContainsKey(origin.getId()))
{
vertices.Add(origin.getId(), origin);
}
if (!vertices.ContainsKey(destination.getId()))
{
vertices.Add(destination.getId(), destination);
}
if (!edges.Contains(e))
{
edges.Add(e);
}
return(e);
}