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From "Christophe Lombart" <christophe.lomb...@gmail.com>
Subject Re: Using Collections - OCM
Date Fri, 26 Oct 2007 12:17:09 GMT
On 10/26/07, Kaizer <Kaizers@mastek.com> wrote:
>
>
> I had missed out the "extends" attribute for the derived class. It works
> fine
> on adding it. Also, from where can i get more info on using the
> discriminator property?


from the code :-(  I would like to start the doc but I don't  know if the
new confluence stuff are ready.

Thanks!
> Kaizer
>
>
>
> Christophe Lombart wrote:
> >
> > The property discriminator contains the classname. Maybe the some
> > collection
> > descriptor are not using it correctly.
> > If you have no time, I will check this week-end otherwise if you found
> > something, you can send us a patch (in jira).
> >
> > Thanks,
> > Christophe
> >
> > On 10/26/07, Kaizer <Kaizers@mastek.com> wrote:
> >>
> >>
> >> Thanks a lot! I am using the discriminator approach. In fact i was
> >> thinking
> >> of writing my own CollectionConverter wherein I would save the object
> by
> >> taking the class of the item being stored rather than from the
> >> "elementClassName" attribute. But the problem would be that while
> >> retrieving
> >> the object, I wouldnt have the class name to instantiate.
> >> Thanks again!
> >>
> >> Regards
> >> Kaizer
> >>
> >>
> >>
> >> Christophe Lombart wrote:
> >> >
> >> > Sorry for the delay I was very busy this week.
> >> >
> >> > Which inheritance strategy are you using ? Are you using the a
> >> > discriminator
> >> > or a different node type per Class ?
> >> >
> >> > There are 2 possibilities :
> >> >
> >> > 1/ Using a different node type per class in the hierarchy, here is a
> >> > example
> >> > from the unit test. The implement-descriptor is not mandatory.
> >> >
> >> > <class-descriptor
> >> > className="
> >> org.apache.jackrabbit.ocm.testmodel.inheritance.impl.FolderImpl"
> >> > jcrType="ocm:folderimpl"
> >> >
> >> > extend="
> >> org.apache.jackrabbit.ocm.testmodel.inheritance.impl.CmsObjectImpl"
> >> > discriminator="false"  >
> >> >   <implement-descriptor
> >> > interfaceName="org.apache.jackrabbit.ocm.testmodel.interfaces.Folder"
> >> > />
> >> >    <collection-descriptor fieldName="children" proxy="true"
> >> > autoUpdate="false"
> >> >
> >> > elementClassName="
> >> org.apache.jackrabbit.ocm.testmodel.inheritance.impl.CmsObjectImpl"
> >> >
> >> > collectionConverter="
> >>
> org.apache.jackrabbit.ocm.manager.collectionconverter.impl.NTCollectionConverterImpl
> >> "
> >> > />
> >> > </class-descriptor >
> >> >
> >> >
> >> > 2/ Using a discriminator (discriminator =true). It  can be used when
> >> you
> >> > are
> >> > using the same node type for the complete class hierarchy. There is
> no
> >> > unit
> >> > tests on collection-descriptor with a discriminator. So, I will write
> a
> >> > new
> >> > unit test for this use cases and I will give some feedback. So maybe
> >> there
> >> > are some bug for this kind of situation.
> >> >
> >> > Again sorry for the delay.
> >> >
> >> > br,
> >> > Christophe
> >> >
> >> > On 10/24/07, Kaizer <Kaizers@mastek.com> wrote:
> >> >>
> >> >>
> >> >> Hi,
> >> >>
> >> >> I have a class A which has a collection of objects of type B. I have
> >> made
> >> >> the corresponding definitions in the mapping xml. However, If i
> create
> >> a
> >> >> class C which extends B and save objects of type C in the list and
> >> then
> >> >> try
> >> >> to retrieve them, I always get an instance of B as the
> >> >> ObjectConverterImpl
> >> >> always creates a new instance of the "elementClassName" defined in
> the
> >> >> mapping (which would be B in this case). How can i achieve the
> storage
> >> >> and
> >> >> retrieval in this scenario?Would I require a custom
> >> CollectionConverter?
> >> >>
> >> >> Thanks.
> >> >>
> >> >> Regards
> >> >> Kaizer
> >> >> --
> >> >> View this message in context:
> >> >>
> http://www.nabble.com/Using-Collections---OCM-tf4683858.html#a13384206
> >> >> Sent from the Jackrabbit - Users mailing list archive at Nabble.com.
> >> >>
> >> >>
> >> >
> >> >
> >>
> >> --
> >> View this message in context:
> >> http://www.nabble.com/Using-Collections---OCM-tf4683858.html#a13422253
> >> Sent from the Jackrabbit - Users mailing list archive at Nabble.com.
> >>
> >>
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Using-Collections---OCM-tf4683858.html#a13423421
> Sent from the Jackrabbit - Users mailing list archive at Nabble.com.
>
>

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