public function slotToArray($slotName)
    {
        if (!is_string($slotName)) {
            throw new InvalidArgumentTypeException('exception_slotToArray_accepts_only_strings');
        }

        if (!array_key_exists($slotName, $this->slotManagers)) {
            return array();
        }

        $slotManager = $this->slotManagers[$slotName];

        return $slotManager->getBlockManagersCollection()->toArray();
    }