+std::string TARIFF_IMPL::TariffChangeIsAllowed(const TARIFF & to) const
+{
+time_t timeout = GetChangePolicyTimeout();
+if (stgTime > timeout && timeout != 0)
+ return "";
+switch (GetChangePolicy())
+ {
+ case TARIFF::ALLOW:
+ return "";
+ case TARIFF::TO_CHEAP:
+ if (to.GetFee() < GetFee())
+ return "";
+ else
+ return "New tariff '" + to.GetName() + "' is more expensive than current tariff '" + GetName() + "'. The policy is '" + TARIFF::ChangePolicyToString(GetChangePolicy()) + "'.";
+ case TARIFF::TO_EXPENSIVE:
+ if (to.GetFee() >= GetFee())
+ return "";
+ else
+ return "New tariff '" + to.GetName() + "' is more cheap than current tariff '" + GetName() + "'. The policy is '" + TARIFF::ChangePolicyToString(GetChangePolicy()) + "'.";
+ case TARIFF::DENY:
+ return "Current tariff '" + GetName() + "', new tariff '" + to.GetName() + "'. The policy is '" + TARIFF::ChangePolicyToString(GetChangePolicy()) + "'.";
+ }
+}
+//-----------------------------------------------------------------------------