public function getDataItemStreamWrapper(string $key): \BearFramework\App\IDataItemStreamWrapper
    {
        return new \BearFramework\App\FileDataItemStreamWrapper($key, $this->dir);
    }
public function getDataItemStreamWrapper(string $key): \BearFramework\App\IDataItemStreamWrapper
    {
        return new \BearFramework\App\FileDataItemStreamWrapper($key, $this->dir);
    }
public function getDataItemStreamWrapper ( string $ key ) : \ BearFramework \ App \ IDataItemStreamWrapper { return new \ BearFramework \ App \ FileDataItemStreamWrapper ( $ key , $ this -> dir ) ; }
Returns a DataItemStreamWrapper for the key specified.

@param string $key The data item key.
@return \BearFramework\App\IDataItemStreamWrapper
Returns a DataItemStreamWrapper for the key specified .