toByteStream() public method

Write this message to a {@link Swift_InputByteStream}.
public toByteStream ( Swift_InputByteStream $is )
$is Swift_InputByteStream
 /**
  * Write this message to a {@link Swift_InputByteStream}.
  *
  * @param Swift_InputByteStream $is
  */
 public function toByteStream(Swift_InputByteStream $is)
 {
     if (empty($this->headerSigners) && empty($this->bodySigners)) {
         parent::toByteStream($is);
         return;
     }
     $this->saveMessage();
     $this->doSign();
     parent::toByteStream($is);
     $this->restoreMessage();
 }