/**
  * Get the tax rate for an item to an address. If address is null,
  * a default address should be used.
  * 
  * @param  Product    $product The product to calulate tax for
  * @param  Address    $address The address delvered to
  * @return Collection          The tax rates to be applied
  * @throws AddressNotSetException If no address given or default address set
  */
 public function getProductTaxRates(Product $product, Address $address = null)
 {
     if ($address === null) {
         $address = $this->_defaultAddress;
     }
     if (!$address) {
         throw new \LogicException('No address given and no default address set. Either provide an address or ensure a default address is set on the loader.');
     }
     return $this->_taxResolver->getTaxRates($product->getType()->getName(), $address);
 }