Hello,
I couldn't find my specific question in the archives, so I am posting it
here. Please CC any reply as I am not subscribed. I am using ojb-rc6
with a postgreSQL database.
I have an object hierarchy implemented which uses the
"one-table-per-class" approach along with join tables for collections.
Everything works great, but after enabling dynamic proxies on the
collections I am unable to identify the different class instances in the
collection once they are loaded from the DB.
Example: Say I have three classes, Foo, Bar, and Baz. The inheritance is
such that Foo <- Bar <- Baz. Now, I create an object with contains a
collection of "Foo" objects which are populated by a mix of Foo, Bar and
Baz objects. This object is then serialize to the DB.
Here is an outline of how the mapping is structured:
<class-descriptor class="Foo" table="foo">
<extent-class class-ref="Bar" />
<extent-class class-ref="Baz" />
</class-descriptor>
<class-descriptor class="Bar" table="bar" />
<extent-class class-ref="Baz" />
</class-descriptor>
<class-descriptor class="Baz" table="baz" />
<class-descriptor class="MyObject" table="myobj">
<collection-descriptor name = "foos"
element-class-ref = "Foo"
proxy = "true"
auto-retrieve = "true"
indirection-table = "myobj_foos"
>
<fk-pointing-to-this-class column = "myobj_id"/>
<fk-pointing-to-element-class column = "foo_id"/>
</collection-descriptor>
</class-descriptor>
Now, if I load the saved object, the dynamic proxy object are all created
as proxies to an object of type "Foo". I can no longer reflect of the
loaded data or use "instanceof" to identify objects.
So my question is: How can I get at the underlying object type using
dynamic proxies? Is there a standard way to deal with this case?
To be clear, everything works fine without using dynamic proxies.
Thank you in advnace,
-Lucas Scharenbroich
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