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Subject: Re: [betwixt] Betwixt mapping of generic lists with instances of
	an interface
From: robert burrell donkin <robertburrelldonkin@blueyonder.co.uk>
To: Jakarta Commons Users List <commons-user@jakarta.apache.org>
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Date: Thu, 18 May 2006 23:23:18 +0100
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i've committed a change in the default mapping for lists. please build
from the latest code. i've updated the website with some documentation
but it'll take a while to sync and you may be better looking at the unit
tests. see src/test/org/apache/commons/betwixt/poly/TestPolyList.java.

- robert

On Wed, 2006-05-17 at 22:21 +0100, robert burrell donkin wrote:
> On Thu, 2006-05-11 at 14:22 +0200, Holger Haag wrote:
> > Hi all,
> > 
> > I'm trying to figure out how (or if) it is possible to handle lists
> > containing instances of an interface.
> > 
> > Sample:
> > 
> > // the interface
> > public interface MyInterface {
> >   ..
> > }
> > 
> > // an implementation
> > public class MyImpl1 implements MyInterface {
> >   ..
> > }
> > 
> > // an implementation
> > public class MyImpl2 implements MyInterface {
> >   ..
> > }
> > 
> > // the list containing instances of MyInterface
> > public class MyList extends java.util.List<MyInterface> {
> >   ..
> > }
> > 
> > 
> > A serialized sample should look like the following
> > 
> > <list>
> >   <!-- serialized instance of MyImpl1 -->
> >   <impl1>
> >   </impl1>
> >   
> >   <!-- serialized instance of MyImpl2 -->
> >   <impl2>
> >   </impl2>
> >   
> >   <!-- serialized instance of MyImpl1 -->
> >   <impl1>
> >   </impl1>
> > </list>
> > 
> > 
> > I think this is currently not possible via betwixt (pls. correct me if I am
> > wrong) 
> > since all list items will be named "myinterface" or so thus loosing the
> > proper type information.
> 
> <snip>
> 
> > So the question boils down to how to setup polymorphic mapping for generic
> > lists. 
> > http://jakarta.apache.org/commons/betwixt/guide/reading.html only details
> > how to do this for a container, but nothing about lists/collections.
> 
> there are two parts to this problem: the first is configuring
> polymorphic mappings so that the reading works. the second is persuading
> betwixt to write the right names. it's easiest to attack them
> separately.
> 
> the documentation should give a reasonable description about how to
> setup the multi mapping so that the reading works. 
> 
> the second problem is covered in
> http://jakarta.apache.org/commons/betwixt/guide/derived.html. you may
> need to switch mapping derivation to introspection time. 
> 
> the only wrinkle is that it might be difficult to configure a list
> (rather than a container). i'm not ATM whether this will be a problem or
> not. i'll try to find time tomorrow to try this out.
> 
> - robert
> 
> 
> 
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