NodeFunction::process

public function process(EntityBase $entity)
{
	$functionObject = FunctionsFabric::createInstance($this->functionName);
	if ($functionObject instanceof FunctionsFunctionBase)
	{
		$arguments = $functionObject->onPrepareParameters($entity, $this->parameters);
		return $functionObject->calculate($arguments);
	}
	else
	{
		return "";
	}
}