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From: robert burrell donkin <robertburrelldonkin@blueyonder.co.uk>
Subject: Re: [betwixt] Howto serialize the classname when writing XML
Date: Mon, 27 Sep 2004 22:51:12 +0100
To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org>
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On 26 Sep 2004, at 18:59, Christoph Gaffga wrote:

> hi,
>
> I have to output some Exception instances to XML using betwixt, but it
> doesn't seem to be possible to get the class name into the XML result.

yep. it's on the todo...

> First of all it should output the name of the class only, and not 
> introspect
> the whole Class type. This is done well because the type Class is 
> handled as
> a primitive type (see
> TypeBindingStrategy.Default.isStadardPrimitive(Class)).

a concrete example would be useful (so i'm sure i understand you 
correctly)...?

(i'm guessing that you want to map a com.example.SomeException class to 
xml which looks something like:

<exception>
	<message>Mysterious problem</message>
	<class>com.example.SomeException<class>
</exception>)

> But the output of the class name is deactivated in betwixt for whatever
> reason and there is no configuration option for turning it on for some
> classes, or plugging some custom rules in for that.

that's true.

this is related to the derived beans stuff i've been looking at 
recently. i should really add support for writing types (so that 
betwixt supports round tripping for simple attribute typed derived 
beans) so i'll probably take a look at coding this up sometime soonish. 
but it's important that i understand your use case so i make that i 
cover it.

<snip>

> I don't want to output the class property for all beans, I just want 
> to have it for
> all beans derived from java.lang.Throwable.

so, you'll need a coursely grained pluggable strategy. probably also 
want to be able to  override in a betwixt file but that seem like it's 
a secondary priority.

> Does anybody has a hint for me, where to start? I can't get the parent 
> bean
> containing the property 'class' in configureProperty(..) method, only
> PropertyDescriptor, that does not has a context.

i'm happy to take a look at coding this up but i other pots on the boil 
right now so it might take a few days...

- robert


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