Imbo\EventListener\ImageVariations::configureStorage PHP Method

    private function configureStorage(array $config)
    {
        if (!isset($config['storage']) || !isset($config['storage']['adapter'])) {
            throw new InvalidArgumentException('Missing storage adapter configuration for the image variations event listener', 500);
        }
        $config = $config['storage'];
        if (is_callable($config['adapter'])) {
            $storageAdapter = $config['adapter']();
        } else {
            if (is_string($config['adapter'])) {
                $storageAdapter = new $config['adapter'](isset($config['params']) ? $config['params'] : null);
            } else {
                $storageAdapter = $config['adapter'];
            }
        }
        if (!$storageAdapter instanceof StorageInterface) {
            throw new InvalidArgumentException('Invalid storage adapter for the image variations event listener', 500);
        }
        $this->storage = $storageAdapter;
    }