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From "Ivan Diana (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DIGESTER-171) Add DefaultThrowingErrorHandler to Digester API.
Date Thu, 14 Mar 2013 08:58:12 GMT

    [ https://issues.apache.org/jira/browse/DIGESTER-171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13602145#comment-13602145
] 

Ivan Diana commented on DIGESTER-171:
-------------------------------------

Just a note about general use of Error Handler, maybe we can put this info on wiki: 
if parsing of an xml make a fatal error (SEVERITY_FATAL_ERROR), the class com.sun.org.apache.xerces.internal.impl.XMLErrorReporter
on line 388 calls the error handler and then throw ParseException

Bye
Ivan

                
> Add DefaultThrowingErrorHandler to Digester API.
> ------------------------------------------------
>
>                 Key: DIGESTER-171
>                 URL: https://issues.apache.org/jira/browse/DIGESTER-171
>             Project: Commons Digester
>          Issue Type: Improvement
>    Affects Versions: 3.2
>            Reporter: Nick Williams
>            Priority: Minor
>         Attachments: DIGESTER-171.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> The current default error handling behavior is for the SAX parses to NOT throw exceptions
when they occur, but instead to log them to stderr. This is fine and I am not suggesting that
be changed. However, there is a wiki article (http://wiki.apache.org/commons/Digester/FAQ)
that describes the common task of implementing an error handler that throws encountered errors.
> If this is so common, it would seem that including such an error handler in the API would
be a very convenient thing to do.
> I propose that the following class be added to the digester to make it convenient for
anyone to turn on this behavior:
> {code}package org.apache.commons.digester3;
> import org.xml.sax.ErrorHandler;
> import org.xml.sax.SAXException;
> import org.xml.sax.SAXParseException;
> public class DefaultThrowingErrorHandler implements ErrorHandler
> {
>     @Override
>     public void warning(SAXParseException e) throws SAXException
>     {
>         throw e;
>     }
>     @Override
>     public void error(SAXParseException e) throws SAXException
>     {
>         throw e;
>     }
>     @Override
>     public void fatalError(SAXParseException e) throws SAXException
>     {
>         throw e;
>     }
> }{code}
> Furthermore, I propose that the DigesterLoader and Digester classes have setThrowEncounteredSAXErrors(boolean)
methods that set the error handler to the DefaultThrowingErrorHandler..

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