public function setStream($stream = null)
    {
        // String passed in? Try converting it to a stream
        if (is_string($stream)) {
            $stream = @fopen($stream, 'a');
        }

        // Make sure the stream is a resource
        if (!is_resource($stream)) {
            throw new \InvalidArgumentException('Invalid Stream');
        }

        // Store it
        $this->stream = $stream;

        // Afford chaining
        return $this;
    }