在訊息格式之間轉碼

private static final String NEW_FORMAT = "JMS:text";

public boolean(MessageContext context) throws MessageContextException
{
  try
  {
    SIMessageContext msgCtx  = (SIMessageContext)context;
    SIMessage        msg     = msgCtx.getMessage();
    DataGraph        newDg   = msg.getNewDataGraph(NEW_FORMAT);

    msg.setDataGraph(newDg,NEW_FORMAT);
    return true;
  }
  catch(Exception e)
  {
    // Reroute the original message to the exception destination
    MessageContextException mce = 
      new MessageContextException("Unable to transcode to "+NEW_FORMAT",e);
    throw mce;
  }
}