Hi,
The Unmarshaller.setReuseObjects(boolean) also applies when graphs of
objects are stored? Some time ago, I posted a similar problem, and a
suggested solution was a mapping file using "reference" and "identity" in
conjunction... but I found it was not straight forward (I may be doing
something wrong), since it seemed to be necessary to add a method to my
classes to provide and objectID. Below I include a very basic mapping file
to ilustrate this.
1) is this the right aproach? Should I use set Unmarshaller.ReuseObjects
instead?
2)Is there any way to avoid modifying my classes adding an extra method?
<!DOCTYPE databases PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN"
"http://castor.exolab.org/mapping.dtd";>
<mapping>
<!-- Mapping for Person -->
<class name="castortest.Person" identity="id">
<field name="id" type="string" >
<bind-xml node="attribute"/>
</field>
<field name="name" type="string">
<bind-xml node="attribute" />
</field>
<field name="friend" type="castortest.Person">
<bind-xml node="attribute" reference="true"/>
</field>
</class>
</mapping>
Thanks a lot!
Hans
----- Original Message -----
From: "Keith Visco" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, February 27, 2002 5:45 AM
Subject: Re: [castor-dev] Question: Marshalling/Unmarshalling Object
Structures...
>
>
> "Quinn, Kim John" wrote:
> >
> > Hello everyone,
> >
> > Testing out Castor for potential use and so far think its great but I
have a
> > 2 questions:
> >
> > Let's say for instance I have the following structure:
> >
> > Class A, with 2 children B and C...so
> >
> > --Person
> > |
> > |--1---*-->ContactMethod
> > |
> > |--1---*-->Address
> >
> > I create a new instance, fill the values for all objects, store it, then
> > marshall it out to XML...that works fine.
> >
> > QUESTION 1: Now, I want to unmarshall the XML "back into" this
> > structure....do I have to manually iterate the children because only my
root
> > object is getting "updated?" The children are all being inserted as
new.
> >
>
> You might want to try the CVS version...I added initial support for
> Unmarshaller#setReuseObjects(boolean) which, when set to true, will
> try to reuse exising objects within the tree. Simple tests are working
> for me. I haven't had a chance to do extensive testing....
>
> --Keith
>
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