BasketBuilder::preliminaryDataPreparation

public function preliminaryDataPreparation()
{
	foreach($this->formData["PRODUCT"] as $basketCode => $productData)
	{
		if(!$this->checkProductData($productData))
		{
			throw new BuildingException();
		}

		if(self::isBasketItemNew($basketCode))
		{
			$basketInternalId = intval(mb_substr($basketCode, 1));

			if($basketInternalId > $this->maxBasketCodeIdx)
				$this->maxBasketCodeIdx = $basketInternalId;

			// by the way let's mark rows for update data if need
			if($this->isNeedUpdateNewProductPrice()) //???is it right for edit orders
			{
				$this->needDataUpdate[] = $basketCode; //???is it needed by new orders
				unset($this->formData["PRODUCT"][$basketCode]["PROVIDER_DATA"]);
				unset($this->formData["PRODUCT"][$basketCode]["SET_ITEMS_DATA"]);
			}
		}
	}

	/*
	 * Because of one of discounts, require that the first product must be the most expencsve.
	 * If we want to save the sorting of the products we must use field "SORT" - fill it earlier
	 * and use it during layout.
	*/

	sortByColumn($this->formData["PRODUCT"], array("BASE_PRICE" => SORT_DESC, "PRICE" => SORT_DESC), '', null, true);
	return $this;
}