Module_Storage::__construct

public function __construct($config_name = null)
{
    if (null===$config_name)
    {
        $config_name = Storage::DEFAULT_CONFIG_NAME;
    }

    if (is_array($config_name))
    {
        $this->config = $config_name;
    }
    else
    {
        $this->config = Core::config('storage.' . $config_name);
    }

    if (!isset($this->config['driver']))
    {
        $this->config['driver'] = Storage::DRIVER_FILE;
    }

    $driver = 'Storage_Driver_' . $this->config['driver'];
    if (!class_exists($driver, true))
    {
        throw new Exception(__('The :type driver :driver does not exist', array(':type'=>'Storge',':driver'=>$this->config['driver'])));
    }

    $this->driver = new $driver($this->config['driver_config']);

    # 设置前缀
    if ($this->config['prefix'])
    {
        $this->driver->set_prefix($this->config['prefix']);
    }
}