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How to get an EObject from an EObjectNode [message #1010446]

Sun, 17 February 2013 10:10

Andrea Sindico

Messages: 266
Registered: November 2010

Senior Member

n an independent ViewPart I managed to get the EObjectNode selected in the OutlineView. I now need to get the EObject it refers to but I can't see how.

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Re: How to get an EObject from an EObjectNode [message #1010452 is a reply to message #1010446]

Sun, 17 February 2013 10:32

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

have a look at org.eclipse.xtext.ui.editor.outline.impl.AbstractOutlineNode.readOnly(IUnitOfWork<T, EObject>)

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: How to get an EObject from an EObjectNode [message #1010469 is a reply to message #1010452]

Sun, 17 February 2013 11:52

Andrea Sindico

Messages: 266
Registered: November 2010

Senior Member

I have seen the object selected in the outline is a AbstractOutlineNode.
I can't see how to use the readonly method to get the related EObject. I understand from some blogs i found on the Internet that IUnitOfWork i used to get an EObject from the DSL editor. Is it exploitable to this purpose as well? How should I used it?

Thanks for your kind help

Regards

Follow me on Twitter @andreasindico

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Re: How to get an EObject from an EObjectNode [message #1010472 is a reply to message #1010469]

Sun, 17 February 2013 12:01

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

No,

i just help you to do work on it.

if you want to process it further.

(1) your iresourcesetprovider to obtain a resourceset for the project
(2) ask the resourceset for a resource with the objects uri (with trimmed fragment)
(3) use to get the object from the resource with org.eclipse.emf.ecore.resource.Resource.getEObject(String) and the fragment

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: How to get an EObject from an EObjectNode [message #1010579 is a reply to message #1010472]

Sun, 17 February 2013 19:01

Andrea Sindico

Messages: 266
Registered: November 2010

Senior Member

This is the answer I was looking for

if (selection instanceof IStructuredSelection) {
        Object first = ((IStructuredSelection)selection).getFirstElement();
        EObjectNode enode = (EObjectNode)first;
        ResourceSet resourceSet = new ResourceSetImpl();
        Resource inResource = resourceSet.getResource(enode.getEObjectURI(),true);
        MyEcoreElement element = (MyEcoreElement)inResource.getEObject(enode.getEObjectURI().fragment());
        //....  
 }

Regards

Follow me on Twitter @andreasindico

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Re: How to get an EObject from an EObjectNode [message #1010603 is a reply to message #1010579]

Sun, 17 February 2013 20:40

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

No. Christian told you about IUnitOfWork, which is fundamental to
correct use of Xtext. (Xtext doesn't use URIs just to make your life
difficult; it's to protect you from unsafe access to the EObjects. The
IUnitOfWork provides the safe access.)

At best your approach requires a model reload; it may not be a loadable URI.

At worst you get a stale copy.

Regards

Ed Willink

On 17/02/2013 19:01, Andrea Sindico wrote:
> This is the answer I was looking for
>
> if (selection instanceof IStructuredSelection) {
> Object first =
> ((IStructuredSelection)selection).getFirstElement();
> EObjectNode enode = (EObjectNode)first;
> ResourceSet resourceSet = new ResourceSetImpl();
> Resource inResource =
> resourceSet.getResource(enode.getEObjectURI(),true);
> MyEcoreElement element =
> (MyEcoreElement)inResource.getEObject(enode.getEObjectURI().fragment());
> //.... }
>
> Regards

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