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Removing EList element doesn't kill References from Other Objects [message #519328]

Mon, 08 March 2010 14:19

El Mariachi

Messages: 11
Registered: February 2010

Junior Member

Hi there! I'm having a real annoying Problem.

Let's imagine the following very simple ecore diagram called Mdl:

http://www.monsterup.com/upload/1268056978130.png

Let's consider a B object is referencing an A object. If a remove A from the ArrayOfA, the B object is still referencing the removed A object.

code example :

//========================================//

Root oRoot = MdlFactory.eInstance.createRoot();
A oA = MdlFactory.eInstance.createA();
B oB = MdlFactory.eInstance.createB();

oRoot.getArrayOfA.add(oA);
oRoot.getArrayOfB.add(oB);
oB.setRefA(oA );

oRoot.getArrayOfA().remove(oA );

if(oB.getRefA() != null)
System.out.println("Still Existing!!!");
else
System.out.println("Deleted");

//========================================//

In this case, the removed object A, still exist for object B.
So is there something to configure in the genmodel to change this behavior?

Is there a way to found all the EObjects refrenced by an EObject?

Thanks!

Emiliano El Mariachi

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Re: Removing EList element doesn't kill References from Other Objects [message #519349 is a reply to message #519328]

Mon, 08 March 2010 10:08

Ed Merks

Messages: 33137
Registered: July 2009

Senior Member

Comments below.

El Mariachi wrote:
> Hi there! I'm having a real annoying Problem.
>
> Let's imagine the following very simple ecore diagram called Mdl:
>
> http://www.monsterup.com
>
> Let's consider a B object is referencing an A object. If a remove A
> from the ArrayOfA, the B object is still referencing the removed A
> object.
>
> code example :
> //========================================//
>
> Root oRoot = MdlFactory.eInstance.createRoot();
> A oA = MdlFactory.eInstance.createA();
> B oB = MdlFactory.eInstance.createB();
>
> oRoot.getArrayOfA.add(oA);
> oRoot.getArrayOfB.add(oB);
> oB.setRefA(oA );
>
> oRoot.getArrayOfA().remove(oA );
>
> if(oB.getRefA() != null)
> System.out.println("Still Existing!!!");
> else
> System.out.println("Deleted");
>
> //========================================//
>
> In this case, the removed object A, still exist for object B.
> So is there something to configure in the genmodel to change this
> behavior?
No.
>
> Is there a way to found all the EObjects refrenced by an EObject?
A delete command normally finds all references and removes them. A
remove command doesn't do that though. EcoreUtil.delete is the
non-command way to do this. Have a look in DeleteCommand how it uses a
cross referencer to find all references to clean them all up.
>
> Thanks!

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Removing EList element doesn't kill References from Other Objects [message #519672 is a reply to message #519349]

Tue, 09 March 2010 16:28

El Mariachi

Messages: 11
Registered: February 2010

Junior Member

Thanks a lot, the delete command is working fine.
I simply wrote the following code :

EcoreUtil.delete(m_oA);
instead of
oRoot.getArrayOfA().remove(oA );

All the objects referencing oA are now null as expected.

Thanks!!!

Emiliano El Mariachi

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