static public function notNull($value, $message = null, $propertyPath = null)
        {
            if ($value === null) {
                $message = $message ?: sprintf(
                    'Value "%s" is null, but non null value was expected.',
                    static::stringify($value)
                );

                throw static::createException($value, $message, static::VALUE_NULL, $propertyPath);
            }
        }