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From: Arturo Perez <aperez@hayesinc.com>
Subject: Re: FOP 0.92b Logger
Date: Wed, 5 Jul 2006 14:43:57 +0000 (UTC)
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Heinzer David <heinzer.david <at> wanadoo.fr> writes:

> 
> Thanks a lot everybody for your help ! :)
> Now, with all your advises, I will try to resolve my problem... :)
> It's right log4j is very powerful, I made some examples to understand its use,
> it's relatively easy. But if I understand well, with FOP, the only thing to do
> is to configure the ouput display with configuration of Jakarta, the "abstract
> layer" between FOP and , by example, log4j.
> 
> Arturo, if you always agree, I will be interesting for your code. 
> I thank you in advance.
> 
> Best regards
> 
> Heinzer David
> heinzer.david AT wanadoo.fr
> 


Here's what I do:


// this part goes just before you start the FOP rendering process
Logger fopLogger = Logger.getLogger("org.apache.fop");
NullOutputStream errorOutput = new NullOutputStream();
Appender errorAppender = 
  new WriterAppender(new ActionErrorLayout(errors, infoMsgs), errorOutput);
fopLogger.addAppender(errorAppender);


// this class converts the LoggingEvent into Struts ActionMessage.
class ActionErrorLayout extends Layout {
ActionErrors errors;
ActionMessages messages;

public ActionErrorLayout(ActionErrors errors, ActionMessages infoMsgs) {
      this.errors = errors;
      this.messages = infoMsgs;
}

public String format(LoggingEvent arg0) {
      if (arg0.getLevel() == org.apache.log4j.Level.ERROR) {
             ActionError nextError = new ActionError("error.SAXErrorWrapper",
                                                     arg0.getMessage());
             errors.add(ActionErrors.GLOBAL_ERROR, nextError);
      } else {
             ActionMessage nextMsg = new ActionMessage("error.SAXErrorWrapper",
                                                       arg0.getMessage());
             messages.add(ActionMessages.GLOBAL_MESSAGE, nextMsg);
      }
      return "";
}

public boolean ignoresThrowable() {
      return true;
}

public void activateOptions() {			
}
}


HTH,
arturo



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