Re: [eclipselink-users] XMLChoiceCollectionMappingn that maps the same x

[Matt MacIvor <matt.macivor@xxxxxxxxxx>]

Hi Magnus,

You're correct that this behavior isn't supported by the 
XMLChoiceCollectionMapping. This looks like (from your classes) that 
this is more of an inheritence use case. With inheritence, a class 
indicator field is used (typically an xsi:type) to indicate which 
subclass to instantiate during unmarshal.

This is configured using the InheritancePolicy on the descriptors for 
these types, and the class indicator values should reference the complex 
types in your schema. For example (assuming BuildingActivityReference is 
the root of your hierarchy, note, Java inheritance doesn't have to exist 
for this to work):

buildingActivityReferenceDescriptor.getInheritancePolicy().setClassIndicatorField("@xml:type");
buildingActivityReferenceDescriptor.getInheritancePolicy().addClassIndicator(BuildingActivityReference.class, 
"building-activity-reference-type");
buildingActivityReferenceDescriptor.getInheritencePolicy().addClassIndicator(TaxationUnitActivityReference.class, 
"taxation-unit-activity-reference-type");
buildingActivityReferenceDescriptor.getInheritencePolicy().setShouldReadSubclasses(true);
...
taxationUnitActivityReferenceDescriptor.getInheritancePolicy().setParentClass(BuildingActivityReference.class);

Then you would just use an XMLCompositeCollectionMapping:

XMLCompositeCollectionMapping mapping = new XMLCompositeCollectionMapping();
mapping.setXPath("ex:exchangeObjectReference");
mapping.setReferenceClass(BuildingActivityReference.class);

Then depending on the value of the xsi:type attribute it would read in 
the appropriate subclass. Your XML would look something like:

<ex:exchangeObjectReference 
xsi:type="taxation-unit-activity-reference-type">
 ...
</ex:exchangeObjectReference>
<ex:exchangeObjectReference 
xsi:type="building-unit-activity-reference-type">
...
</ex:exchangeObjectReference>

I hope that helps, if not, let me know.

-Matt

Magnus Heino wrote:

> Hi.
>
> Is it possible to create a mapping using XMLChoiceCollectionMappingn
> that maps the same xpath to different classes?
>
> Something like:
>
> XMLChoiceCollectionMapping references = new XMLChoiceCollectionMapping();
> references.addChoiceElement("ex:exchangeObjectReference",
> BuildingActivityReference.class);
> references.addChoiceElement("ex:exchangeObjectReference",
> TaxationUnitActivityReference.class);
>
> where it would first try to map it as a BuildingActivityReference, if
> that doesn't work, try a TaxationUnitActivityReference.
>
> Since the addChoiceElement call stores things in a Map, I guess this
> isn't supported. Or should I use some other type of mapping? Or does
> anyone have any suggestions of how I could implement this myself?
>
> Thanks!
>
> /Magnus Heino
> _______________________________________________
> eclipselink-users mailing list
> eclipselink-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>