Sure, I recognize that java is behaving as expected. But surely this is
not the first time this has come up.
I would have imagined many people want to do this, and for us, we'd
rather avoid clone/copy because we expect to do it a lot.
Thanks.
R
-----Original Message-----
From: Jay Goldman [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 14, 2004 5:46 AM
To: [EMAIL PROTECTED]
Subject: Re: [castor-user] [XML] Inheritance and mapping the base class.
Since java objects (unlike c++ objects) do not change their type when
they are 'cast' the castor behavior is correct. In fact, the cast is
essentially meaningless - at runtime you have a Something or a
SomeOtherThing not simply a Base. You could obviously create a Base
instance using the object you have (via clone or copy constructor on
Base) and then marshall this instance.
Jay
-----Original Message-----
From: Rick Ross [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 14, 2004 1:11 AM
To: [EMAIL PROTECTED]
Subject: [castor-user] [XML] Inheritance and mapping the base class.
Hi. I have some base classes I use for a group of classes. Something
like:
public class Base {
// a bunch of bean style getters and setters.
}
public class Something extends Base {
// different getters and setters
}
public class SomeOtherThing extends Base {
// you get the picture...
}
When objects are instantiated, they are always instantiated as Something
or SomeOtherThing objects. When I go to marshall them, I always cast
them into Base objects because that is all I want marshalled. However, I
always get the fields from Something and SomeOtherThing.
In fact, in the xml output, the class attribute is always the fully
qualified class name of the instantiated class, not the base class.
I have tried a mapping and using the "extends" attribute, but that did
not work either. In that case, the output had something like
some-other-thing as the class name, which I seem to recall is a castor
name mangling convention.
I thought I could do this in the mapping :
<class name="SomeOtherThing" extends="Base" />
<class name="Base">
... all of my mapping for the base class fields here. </class>
Can anyone offer a bit of insight? Am I just missing the concept or
missing a setting?
Thanks
Rick
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