/// <summary>
/// Adds a new edge
/// </summary>
/// <param name="u">source vertex</param>
/// <param name="v">target edge</param>
/// <returns>added edge</returns>
/// <exception cref="ArgumentNullException">u or v is a null reference</exception>
public virtual IEdge AddEdge(IVertex u, IVertex v)
{
if (u == null)
{
throw new ArgumentNullException("u");
}
if (v == null)
{
throw new ArgumentNullException("v");
}
// check if u,v in vertex set
if (!ContainsVertex(u))
{
throw new ArgumentException("graph does not contain u");
}
if (!ContainsVertex(v))
{
throw new ArgumentException("graph does not contain v");
}
// add edge
if (Parent != null)
{
IEdge e = Parent.AddEdge(u, v);
Wrapped.AddEdge(e);
return(e);
}
else
{
return(Wrapped.AddEdge(u, v));
}
}
/// <summary>
/// Adds an existing edge to the cluster
/// </summary>
/// <param name="e">edge to add</param>
public virtual void AddEdge(IEdge e)
{
if (e == null)
{
throw new ArgumentNullException("e");
}
if (Parent != null && !Parent.ContainsEdge(e))
{
Parent.AddEdge(e);
}
Wrapped.AddEdge(e);
}