/// <summary>
/// Accept an incoming invitation by adding it to "acceptedInvitations" and marking it as accepted
/// from the perspective of this Person.
/// </summary>
/// <param name="invitation">Non-null incoming invitation to accept.</param>
public void AcceptInvitation(Invitation invitation)
{
// Add the invitation to the accepted list
acceptedInvitations.Add(invitation);
// Modify the invitation acceptance state
invitation.UpdateStatus(this, InvitationStatus.Accepted);
}
/// <summary>
/// Deletes an incoming invitation, whether it is accepted or pending. Marks the invitation
/// as rejected by this Person.
/// </summary>
/// <param name="invitation">The non-null incoming invitation to delete.</param>
public void DeleteIncomingInvitation(Invitation invitation)
{
// Remove the invitation (from both list if it has been accepted, otherwise it is only removed
// from the incoming invitations list)
incomingInvitations.Remove(invitation);
acceptedInvitations.Remove(invitation);
// Change the acceptance state of the invitation to "rejected"
invitation.UpdateStatus(this, InvitationStatus.Rejected);
}