public function salesruleValidatorProcess(Varien_Event_Observer $observer)
    {

        /* @var $quote Mage_Sales_Model_Quote */
        $quote = $observer->getEvent()->getQuote();

        /* @var $item Mage_Sales_Model_Quote_Item */
        $item = $observer->getEvent()->getItem();

        /* @var $rule Mage_SalesRule_Model_Rule */
        $rule = $observer->getEvent()->getRule();


        /*if ($rule->getSimpleAction() != C4B_Freeproduct_Model_Consts::ADD_GIFT_ACTION
            || $item->getIsFreeProduct()
            || $rule->getIsApplied())
        {
            return;
        }*/

        if ($rule->getSimpleAction() != C4B_Freeproduct_Model_Consts::ADD_GIFT_ACTION
            || $item->getIsFreeProduct())
        {
            return;
        }

          $item->geQty();

        try {
            //$qty = (int)$rule->getDiscountAmount();
            $qty = $item->geQty();
            //$skus = static::_getSkuList($rule->getGiftSku());
            $skus = static::_getSkuList( /*< Get your sku here for item having Id $item->getId() > */);

            foreach ($skus as $sku) {
                /** @var Mage_Sales_Model_Quote_Item $freeItem */
                $freeItem = static::_getFreeQuoteItem($rule->getId(), $sku, $item->getStoreId(), $qty);
                $quote->addItem($freeItem);
                $freeItem->setApplyingRule($rule);
            }

            //$rule->setData('is_applied', true);
        } catch (RuntimeException $e) {
            Mage::logException($e);
        }
    }