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delete an element from model [message #1015896]

Mon, 04 March 2013 08:27

Joshua Yang

Messages: 11
Registered: October 2012

Junior Member

Hi,
I'm quiet new to GFM and I have some problems
How could I delete an element from the data model?
I get the element by the way below:

URI fileUri = URI.createFileURI(modelFilePath); 
ResourceSet resourceSet  = new ResourceSetImpl(); 
			
Resource resource = resourceSet.getResource(fileUri, true);
EList<EObject> eList = resource.getContents();
EObject eObject = eList.get(0);
Model fmToolModel = (Model)eObject;
xxElement x = fmToolModel.get...

what is the best way to delete the element and the links with it?
Deleting only the x while not deleting the links may cause errors that the file could not open.

Giving me the code is what i expected...

Thanks~

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Re: delete an element from model [message #1015914 is a reply to message #1015896]

Mon, 04 March 2013 09:19

Andreas Muelder

Messages: 73
Registered: July 2011

Member

Hi Joshua,

when do you want to delete the semantic model element? Is there some user interaction involved? Basically, you should delete the model element via the Editingdomain using commands to support undo / redo, for example the DestroyElementCommand.

To delete the links, it is important how your model is structured. If the links eContainer is the element you deleted, it will be deleted automatically. If not, there are some hooks like GMFs EditHelper#getDestroyDependentsCommand you could use.

Maybe you can explain your use case in more detail?

Best regards,

Andreas

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Re: delete an element from model [message #1015918 is a reply to message #1015914]

Mon, 04 March 2013 09:28

Joshua Yang

Messages: 11
Registered: October 2012

Junior Member

maybe it could be another question since I find that right click pop menu contains
the command to delete selected element("DestroyElementCommand" as you mentoned).

The problem may be is this:

how to call the command in a pop menu?

Thank you for the quick reply~^_^

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Re: delete an element from model [message #1015920 is a reply to message #1015918]

Mon, 04 March 2013 09:32

Andreas Muelder

Messages: 73
Registered: July 2011

Member

IOperationHistory history = OperationHistoryFactory.getOperationHistory();
history.execute(new DestroyElementCommand(new DestroyElementRequest(toDelete, false)), new NullProgressMonitor(), null);

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Re: delete an element from model [message #1015922 is a reply to message #1015920]

Mon, 04 March 2013 09:39

Joshua Yang

Messages: 11
Registered: October 2012

Junior Member

is DestroyElementCommand a generated class or ...

it looks as if that not fits my situation well...

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Re: delete an element from model [message #1015925 is a reply to message #1015922]

Mon, 04 March 2013 09:42

Andreas Muelder

Messages: 73
Registered: July 2011

Member

No, it is a runtime class.
Add a plugin dependency to org.eclipse.gmf.runtime.emf.type.core.

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Re: delete an element from model [message #1015937 is a reply to message #1015925]

Mon, 04 March 2013 10:32

Joshua Yang

Messages: 11
Registered: October 2012

Junior Member

sorry to reply so late
but the code throws exception...

Could you please give a helping hand?

org.eclipse.core.commands.ExecutionException: While executing the operation, an exception occurred
at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:521)
	at edu.fudan.fdsplc.feature.configuration.model.feature.configuration.presentation.ConfigurationEditor.generateAppModel(ConfigurationEditor.java:469)
	at edu.fudan.fdsplc.feature.configuration.model.feature.configuration.presentation.ConfigurationEditor.access$6(ConfigurationEditor.java:403)
	at edu.fudan.fdsplc.feature.configuration.model.feature.configuration.presentation.ConfigurationEditor$4.widgetSelected(ConfigurationEditor.java:197)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
...
Caused by: java.lang.NullPointerException
	at org.eclipse.emf.workspace.AbstractEMFOperation.inheritedOptions(AbstractEMFOperation.java:252)

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Re: delete an element from model [message #1015954 is a reply to message #1015937]

Mon, 04 March 2013 11:58

Andreas Muelder

Messages: 73
Registered: July 2011

Member

In GMF, it is very important to change the model only via the Editingdomain.
Do not load the model element that you want to delete with a new resourceset.
Instead, load it via your EditingDomain. You can receive it from your active editor,
DiagramDocumentEditor#getEditingDomain() or even better from the selected object TransactionUtil.getEditingdomain(selectedelement);

From your Editing domain you can get the resource set via getResourceSet().

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Re: delete an element from model [message #1015955 is a reply to message #1015954]

Mon, 04 March 2013 12:05

Joshua Yang

Messages: 11
Registered: October 2012

Junior Member

the problem here is
the model i want to change is not the one opened in the editor...

what i want to do is actually like this:
load a model , change the content ,and save it to another file,
while the file my current editor opened is with no relationship with what i did

[Updated on: Mon, 04 March 2013 12:26]

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Re: delete an element from model [message #1015962 is a reply to message #1015954]

Mon, 04 March 2013 12:30

Joshua Yang

Messages: 11
Registered: October 2012

Junior Member

Hi,Andreas

The code finally executed wihout any error.However it does not gose as i wished.

Here gose my code:

ResourceSet resourceSet  = new ResourceSetImpl();
TransactionalEditingDomain domainx = TransactionalEditingDomain.Factory.INSTANCE.createEditingDomain(resourceSet);
Resource res = domainx.loadResource(fileUri.path());
xxxImpl toDelete = (xxxImpl)((xxxModelImpl)res.getContents().get(0)).getXXX().get(0);

IOperationHistory history = OperationHistoryFactory.getOperationHistory();
DestroyElementRequest desRequest = new DestroyElementRequest(toDelete, true);
history.execute(new DestroyElementCommand(desRequest), new NullProgressMonitor(), null);

The code delete the element indeed,while the edgs goes still. it causes the problem that i can not open the file any more.

What should I do ,Could you please give a helping hand?

[Updated on: Mon, 04 March 2013 15:40]

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