Hi Robert,
thanks for the patch, TestPolyList works nicely, also if I adapt it 1:1 to
my environment. However, I failed in setting up a container which holds such
a list, e.g.:
<container>
<mylist>
<myimpl1/>
<myimpl2/>
</mylist>
</container>
I tried
OverrideCollectiveTypeStategy strategy = new
OverrideCollectiveTypeStategy();
strategy.overrideNotCollective(MyList.class);
but that wouldn't work either.
Is there a chance that you can set up another Testcase like
TestPolyListContainer ?? I find that working test cases are the best way to
provide samples.
Rgds
Holger
robert burrell donkin wrote:
>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.
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