Re: [xsl] Xalan, errors and ErrorListener

[Mike Brown]

[EMAIL PROTECTED] wrote:
> The one problem I see in the above scenario is that the exception gets
> passed to the ErrorListener twice... once as an error and once as a fatal
> error.  I'm not sure how realistically clean this up without a
> hasBeenReported flag on Transformer exception, or just assuming that all
TransformerExceptions have been reported at the top level

OK, the situation is pretty much what I afraid it was.

Here's something I see in Saxon's PreparedStylesheet#prepare(SAXSource),
which does the work for TransformerFactoryImpl#newTemplates(Source):

    } catch (TransformerException err) {
        Throwable cause = err.getException();
        if (cause != null) {
            if (cause instanceof SAXParseException) {
                // details already reported, don't repeat them
                throw new TransformerConfigurationException("Failed to parse 
stylesheet");
            } else if (cause instanceof TransformerConfigurationException) {
                throw (TransformerConfigurationException)cause;
            } else {
                throw new TransformerConfigurationException(cause);
            }
        }
        throw new TransformerConfigurationException(err);
    }

Think this might work in Xalan?

I adapted it to work in my testbed ErrorListener as shown below. Seems to be OK, but 
it's
kinda kludgy since the logic really belongs in the application.

import javax.xml.transform.TransformerException;
import org.xml.sax.SAXException;

public class TransformerErrorListener implements javax.xml.transform.ErrorListener
{

  public void warning( TransformerException te ) throws TransformerException
  {
    System.err.println( formatTransformerException( 0, te ) );
  }

  public void error( TransformerException te ) throws TransformerException
  {
    throw new TransformerException( formatTransformerException( 1, te ) );
  }

  public void fatalError( TransformerException te ) throws TransformerException
  {
    Throwable cause = te.getException();
    if ( cause != null )
    {
      if ( cause instanceof SAXException )
      {
        throw te;
      }
      else
      {
        throw new TransformerException( formatTransformerException( 2, te ) );
      }
    }
    else
    {
      throw new TransformerException( formatTransformerException( 2, te ) );
    }
  }

  public static String formatTransformerException( int errType, TransformerException 
te )
  {
    String[] errorTypes = { "WARNING", "ERROR", "FATAL ERROR" };
    String          msg = te.getMessageAndLocation();
    String msgout = "The XSLT processor reported the following " + errorTypes[errType] 
+ ":\n" + msg;
    return msgout;
  }

}