On Mar 27, 2008, at 2:29 AM, Allen,Eva wrote:
We are working with an entity which sometimes adds new xml elements
without remembering to tell us about them. We would like to be able
to
log a warning whenever we encounter an element that we don't know
about.
Is there any way to do this with digester?
Specifically, we have really simple xml files that in essence, look
like
this:
<xmlrecord>
<good>acceptedValue1< /good>
<good>acceptedValue2</good>
<bad>rejectedValue1< /bad>
.
.
.
</xmlrecord>
and the digester rules file looks like this:
<digester-rules>
<pattern value="xmlrecord">
do some stuff
<pattern value="good">
do more stuff
</pattern>
<pattern value="bad">
do even more stuff
</pattern>
</pattern>
</digester-rules>
All of a sudden one day, we got an "xmlrecord" with an "unworthy"
element (names have been changed here to protect the innocent). We
would have liked to log a warning that we didn't know what to do
with an
unworthy element, but I can find no way to tell digester how to parse
that. I've tried patterns "xmlrecord/*" and "*/*" but neither one of
those works. I've looked at the digester documentation including the
wiki page. Everybody talks about generalized pattern matching but
nobody talks about unknown elements. Is there any way to do this with
digester?
--
Eva Allen
Consulting Software Engineer, OCLC, Inc.
6565 Kilgour Pl., Dublin, OH 43017
614.764.6009 | [EMAIL PROTECTED]
Views contained herein are my own; they do not necessarily reflect
those
of my employer
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Eva,
I am not sure how to do this with the xml based rules
configuration, but you can create a default rule using the digester
directly. To do this,
you need to replace the Rules instance on your digester with a
WithDefaultRulesWrapper and set the default rule to do your logging.
Something like:
Digester digester = new Digester();
// Configure your rules.
...
WithDefaultRulesWrapper defaultRules = new
WithDefaultRulesWrapper(digester.getRules());
defaultRules.add(new LogUnknownElementRule());
digester.setRules(defaultRules);
Now, the LogUnknownElementRule will be called when an element does not
match any of the rules in your rules configuration.
--Christian Trimble
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