public BuildParcelChain()
{
_rootChain = new InsuranceDepartment();
IDepartmentChain dep2 = new MailDepartment();
IDepartmentChain dep3 = new RegularDepartment();
IDepartmentChain dep4 = new HeavyDepartment();
_rootChain.SetNext(dep2);
dep2.SetNext(dep3);
dep3.SetNext(dep4);
}
public void SetNext(IDepartmentChain c)
{
_nextInChain = c;
}