public IMobilePlan GetPlan(string planName)
{
IMobilePlan plan = NullObject.Instance();
switch (planName)
{
case "1":
{
plan = new TalkTooMuch28();
break;
}
case "2":
{
plan = new TalkTooMuch100();
break;
}
case "3":
{
plan = new PostPaidSaver();
break;
}
case "4":
{
plan = new PostPaidExclusive();
break;
}
default:
{
break;
}
}
return(plan);
}
static NullObject()
{
instance = new NullObject();
}
