protected function unserializeObject(array $value)
    {
        $className = $value[self::CLASS_IDENTIFIER_KEY];
        unset($value[self::CLASS_IDENTIFIER_KEY]);

        if (isset($value[self::MAP_TYPE])) {
            unset($value[self::MAP_TYPE]);
            unset($value[self::SCALAR_VALUE]);
        }

        if ($className[0] === '@') {
            return self::$objectMapping[substr($className, 1)];
        }

        if (!class_exists($className)) {
            throw new SerializerException('Unable to find class '.$className);
        }

        return (null === ($obj = $this->unserializeDateTimeFamilyObject($value, $className)))
            ? $this->unserializeUserDefinedObject($value, $className) : $obj;
    }