public ItemSpec AddSpec(ItemSpec spec)
{
// todo: the cloning behaviour of the ItemSpec is a bit, confusing.
lock (this)
{
// if the spec is already available, then return the old one and don't add this new one
var duplicate = GetDuplicate(spec);
if (duplicate != null)
{
return(duplicate);
}
var id = ++_nextSpec;
spec = spec.Clone(id);
_specs.Add(id, spec);
}
OnItemAdded(spec);
return(spec);
}