protected function _prepareValidate(Mage_Checkout_Model_Cart $cart)
{
$cart->setData('all_items', $cart->getQuote()->getAllItems());
if ($cart->getQuote()->isVirtual()) {
$address = $cart->getQuote()->getBillingAddress();
} else {
$address = $cart->getQuote()->getShippingAddress();
}
foreach ($cart->getQuote()->getAllItems() as $item) {
$ruleIdOption = $item->getOptionByCode('aw_afptc_rule');
if (null === $ruleIdOption) {
continue;
}
$address->setTotalQty($cart->getItemsQty() - $item->getQty());
$address->setBaseSubtotal($address->getBaseSubtotal() - $item->getBaseRowTotal());
$address->setWeight($address->getWeight() - $item->getWeight());
}
return $this;
}