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Iterating GMF diagram [message #725051]

Tue, 13 September 2011 15:39

Eclipse User

Hi,

I am trying to iterate through elements modeled in diagram. What is the best way to approach that?

Thanks.

Jan

Re: Iterating GMF diagram [message #725055 is a reply to message #725051]

Tue, 13 September 2011 15:55

Eclipse User

Resource.getAllContents can be quite handy.

On 13/09/2011 12:39 PM, janpojer wrote:
> Hi,
>
> I am trying to iterate through elements modeled in diagram. What is
> the best way to approach that?
>
> Thanks.
>
> Jan

Re: Iterating GMF diagram [message #725056 is a reply to message #725055]

Tue, 13 September 2011 16:13

Eclipse User

But does that get the actual modelled element (if i want to erase it)?

Re: Iterating GMF diagram [message #725059 is a reply to message #725056]

Tue, 13 September 2011 16:18

Eclipse User

This is how I iterate the diagram resource:

try {
	for (Iterator<Object> iter = EcoreUtil.getAllContents(res, true); iter.hasNext();) {
		EObject eObject = (EObject) iter.next();
		sw.doSwitch(eObject);
	}
} catch (RuntimeException e) {
	FnDiagramEditorPlugin.getInstance().logError("Element initialization failed", e); 
}

And I am trying to figure out how to remove certain items from the resource (or add) based on some external conditions.

Thanks

Re: Iterating GMF diagram [message #725073 is a reply to message #725056]

Tue, 13 September 2011 17:19

Eclipse User

The graphical elements have references to the underlying model; it's not
clear if you keep both in the same resource or in separate resources.
You'll want to use commands if you're planning to make changes to the
diagram or the model.

On 13/09/2011 1:13 PM, janpojer wrote:
> But does that get the actual modelled element (if i want to erase it)?
>

Re: Iterating GMF diagram [message #725082 is a reply to message #725073]

Tue, 13 September 2011 17:48

Eclipse User

I have only one diagram file, so i persume that all necessary info is in one resource file. I am able to create custom command. What i struggle with is to get the proper view of the iterated elements from resource file so i can pass that to the command and erase it.

Re: Iterating GMF diagram [message #725087 is a reply to message #725082]

Tue, 13 September 2011 17:58

Eclipse User

So the code you're show will definitely visit every diagram element and
also every element of your model. Looking at the serialized XMI should
give you a good sense of the hierarchical structure over which you're
iterating...

On 13/09/2011 2:48 PM, janpojer wrote:
> I have only one diagram file, so i persume that all necessary info is
> in one resource file. I am able to create custom command. What i
> struggle with is to get the proper view of the iterated elements from
> resource file so i can pass that to the command and erase it.

Re: Iterating GMF diagram [message #725088 is a reply to message #725087]

Tue, 13 September 2011 18:30

Eclipse User

Right, I can see the structure... i have there the emf domain elements:

core.fn.impl.RequiredPortImpl@1c4fe21 (name: Challenge/Response CAS/DME_Signal_RQ_0, id: 996f0adc-2337-4524-976c-c8264d11978f)

and the gmf elements (the notation):

org.eclipse.gmf.runtime.notation.impl.NodeImpl@15687d9 (visible: true, type: 2003, mutable: false)

My question is how to remove both the notation and the domain element at once.

Or in oder words how to remove the domain element along with its gmf notation in the diagram...

[Updated on: Tue, 13 September 2011 18:31] by Moderator

Re: Iterating GMF diagram [message #725089 is a reply to message #725088]

Tue, 13 September 2011 18:39

Eclipse User

Your question is slowly evolving...

I'm not an expert on how GMF is implemented. I imagine there's some
type of remove/delete command (as there is in EMF.Edit) that's invoked
when you do this the normal way in the generated editor. You'll need to
learn how to create such commands and execute them in the editor's
command stack. Maybe it's better if you ask such a question directly
(after looking at documentation and using Google) rather than as part of
an evolving "iterating GMF diagram" question...

On 13/09/2011 3:30 PM, janpojer wrote:
> Right, I can see the structure... i have there the emf domain elements:
> core.fn.impl.RequiredPortImpl@1c4fe21 (name: Challenge/Response
> CAS/DME_Signal_RQ_0, id: 996f0adc-2337-4524-976c-c8264d11978f)
> and the gmf elements the notation:
> org.eclipse.gmf.runtime.notation.impl.NodeImpl@15687d9 (visible: true,
> type: 2003, mutable: false)
> My question is how to remove both the notation and the domain element
> at once.
>
> Or in oder words how to remove the domain element along with its gmf
> notation in the diagram...

Re: Iterating GMF diagram [message #725093 is a reply to message #725089]

Tue, 13 September 2011 18:59

Eclipse User

Thanks,

I tried, but noone answered so i tried more global approach.

Re: Iterating GMF diagram [message #725094 is a reply to message #725093]

Tue, 13 September 2011 19:09

Eclipse User

Helpful people seem to be in short supply around here. Best you try to
help yourself by looking at how things work under the covers.

On 13/09/2011 3:59 PM, janpojer wrote:
> Thanks,
>
> I tried, but noone answered so i tried more global approach.
>
>

Re: Iterating GMF diagram [message #725200 is a reply to message #725059]

Wed, 14 September 2011 04:14

Eclipse User

On 13/09/2011 22:18, janpojer wrote:
> This is how I iterate the diagram resource:
>
>
> try {
> for (Iterator<Object> iter = EcoreUtil.getAllContents(res, true);
> iter.hasNext();) {
> EObject eObject = (EObject) iter.next();
> sw.doSwitch(eObject);
> }
> } catch (RuntimeException e) {
> FnDiagramEditorPlugin.getInstance().logError("Element initialization
> failed", e); }

I think you'd rather first get your root semantic element by retrieving
it from DiagramEditPart.resolveSemanticElement() - you can access the
DiagramEditPart either using iterating on getParent from any EditPart,
either by retrieving it from your GraphicalViewer - and then process it.

> And I am trying to figure out how to remove certain items from the
> resource (or add) based on some external conditions.

You should use the DeleteCommand for that, otherwise, you may cause
inconsistencies.

If you are trying to achieve it without opening an Editor, you should
use the OffscreenEditPartFactory that allows you to perform "normal" GMF
operations without seeing an editor open.

--
http://mickaelistria.wordpress.com
http://twitter.com/#!/mickaelistria
http://www.petalslink.com

Re: Iterating GMF diagram [message #725451 is a reply to message #725200]

Wed, 14 September 2011 16:23

Eclipse User

Thnaks for hints. This is what i managed to put together. it works as expected - meaning that it deletes the particular element.

/**get the graphical viewer*/
		IWorkbenchPart part = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActivePart();
		IDiagramWorkbenchPart diagramPart = (IDiagramWorkbenchPart) part.getAdapter(IDiagramWorkbenchPart.class);
		DiagramEditPart diagramEditPart = diagramPart.getDiagramEditPart();
		
		Diagram diagram = diagramEditPart.getDiagramView();
		
		List<NodeImpl> nodesToDelete = new ArrayList<NodeImpl>();
		for (Object v : diagram.getChildren()) {
			NodeImpl node = (NodeImpl) v;
			for (Object o : node.getChildren()) {
				if (o instanceof NodeImpl) {
					NodeImpl chNode = (NodeImpl) o;
					EObject obj = chNode.basicGetElement();
					if (obj instanceof ProvidedPort) {
						ProvidedPort pp = (ProvidedPort) obj;
						if (pp.getName().equals("Challenge/Response CAS/DME_Signal_RQ_2")) {
							nodesToDelete.add(chNode);
						}
					}
				}
			}
		}
		
		CommandStack stack = viewer.getEditDomain().getCommandStack();
		Command deleteViewCommand = new ICommandProxy(new DeleteCommand( TransactionUtil.getEditingDomain(toDelete), nodesToDelete.get(0)));
		stack.execute(deleteViewCommand);

But!

It only deletes its notation (the element on screen). And not the domain model record. Do I really now have to call

EcoreUtil.remove(EObject);

on the particular object?

Isnt there a way to do that all together? Also when i call the remove method it gives me write transaction error. I have to enclose the remove call into specific block?

Thanks for the final help...

Re: Iterating GMF diagram [message #725472 is a reply to message #725451]

Wed, 14 September 2011 17:08

Eclipse User

Ok,
so I got it. All what needs to be done is to remove the underlaying domain model element with following:

                DeleteAction del = new DeleteAction( TransactionUtil.getEditingDomain(toDelete), true);
		org.eclipse.emf.common.command.Command dCmd =  del.createCommand(objToDelete);
		TransactionUtil.getEditingDomain(toDelete).getCommandStack().execute(dCmd);

And it will remove all needed dependencies.

Thanks to all that helped me out.

[Updated on: Wed, 14 September 2011 17:08] by Moderator

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