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Attaching EObject instance to serialized object [message #474620]

Wed, 05 August 2009 17:11

Eclipse User

I have a situation where I have an existing instance of a model object
(derived from EObject) in which I would like to load the contents of the
same type of object that has been previously persisted to a resource. Is
there a way to accomplish this?

Re: Attaching EObject instance to serialized object [message #478692 is a reply to message #474620]

Thu, 06 August 2009 08:31

Eclipse User

Bryan,

ResourceSet.getEObject should do the trick if you have the URI for the
object you want to reference.

Bryan Banz wrote:
> I have a situation where I have an existing instance of a model object
> (derived from EObject) in which I would like to load the contents of
> the same type of object that has been previously persisted to a
> resource. Is there a way to accomplish this?
>

Re: Attaching EObject instance to serialized object [message #478720 is a reply to message #478692]

Thu, 06 August 2009 10:26

Eclipse User

I'm not sure I described my situation clearly enough. Correct me if I'm wrong, but wont getEObject() just create a new instance of an object from the resource containing it?

What I have is a modeled object that I'm trying to treat as a singleton. On that object I have a method that is sort of a "load from file" in which a URI is passed. So I already have an existing object and I'd like to fill out all its attributes and references so that it "becomes" the object that was persisted to the resource.

I know (I don't think) this would work, but perhaps it would get across what I'm trying to do:

EObject object = resource.getContents().get(0);

this = (MyObjectType)object;

Re: Attaching EObject instance to serialized object [message #478796 is a reply to message #478720]

Thu, 06 August 2009 20:00

Eclipse User

Bryan,

Comments below.

Bryan Banz wrote:
> I'm not sure I described my situation clearly enough. Correct me if
> I'm wrong, but wont getEObject() just create a new instance of an
> object from the resource containing it?
It returns the object contained by the resource.
>
> What I have is a modeled object that I'm trying to treat as a
> singleton. On that object I have a method that is sort of a "load from
> file" in which a URI is passed.
That's what resource sets normally do. I'm not sure I understand how or
why a singleton is doing what you describe.
> So I already have an existing object and I'd like to fill out all its
> attributes and references so that it "becomes" the object that was
> persisted to the resource.
That's what proxies are normally used for.
>
> I know (I don't think) this would work, but perhaps it would get
> across what I'm trying to do:
>
> EObject object = resource.getContents().get(0);
>
> this = (MyObjectType)object;
No matter what you're trying to do, loading a resource into a resource
and getting the object from that resource is the way "load from file" is
normally supported.

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