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How to programmtically add EObject into Resource [message #1830726]

Sat, 01 August 2020 15:25

Qiran Cong

Messages: 26
Registered: November 2019

Junior Member

Hi,
Sometimes the datamodel is incomplete, and I want to programmtically generate a default EObject and add it into Resource.
I know emf provide a Ecore Factory to new a EObject. I did and add that into resource.resourSet.

But, XText seems packaged more things into resource, when I'm trying to follow "The index and the containers", like:
def getVisibleContainers(EObject o) { val index = rdp.getResourceDescriptions(o.eResource) val rd = index.getResourceDescription(o.eResource.URI) cm.getVisibleContainers(rd, index) }...
to get the Visible Eobjects of the resource, none of the generated EObject was returned.
what should I do?

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Re: How to programmtically add EObject into Resource [message #1830727 is a reply to message #1830726]

Sat, 01 August 2020 16:09

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

i am not sure what you want to do with the visible containers
but maybe IDerivedStateComputer is the the thing you are looking for
http://xtextcasts.org/episodes/18-model-optimization

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

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Re: How to programmtically add EObject into Resource [message #1830747 is a reply to message #1830727]

Mon, 03 August 2020 05:37

Qiran Cong

Messages: 26
Registered: November 2019

Junior Member

thank you, I might didn't describe my problem correctly.
I programmitcally generated EObject into resource, and then I want to get it's IEObjectDescription in the resource.
I did below test to get all IEObjectDescriptions of same resource, but get different results. seems li1 only contains the initial EObjects of the model script and it only change when the model script changes. but li2 contains all the EObjects including the new generated one. I want to know the differences between those two methods. thank you!
//for Method1:
@Inject ResourceDescriptionsProvider rdp;
//for Method2:
@Inject IResourceServiceProvider.Registry rspr;

//Method1:
IResourceDescription description = rdp.getResourceDescriptions(resource)
.getResourceDescription(resource.getURI());
List<IEObjectDescription> li1 = new ArrayList<IEObjectDescription>();
for (IEObjectDescription eod : description.getExportedObjects()) {
li1.add(eod);
}
//Method2:
IResourceServiceProvider rdp2 = this.rspr.getResourceServiceProvider(resource.getURI());
IResourceDescription.Manager manager2 = rdp2.getResourceDescriptionManager();
IResourceDescription description2 = manager2.getResourceDescription(resource);
List<IEObjectDescription> li2 = new ArrayList<IEObjectDescription>();
for (IEObjectDescription eod : description2.getExportedObjects()) {
li2.add(eod);
}

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Re: How to programmtically add EObject into Resource [message #1830748 is a reply to message #1830747]

Mon, 03 August 2020 05:43

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

How do you add the stuff?
The first one reads the Xtext index
The second one calculates it new
The proper place to do such m2m is the iderivedstatecomputer

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

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Re: How to programmtically add EObject into Resource [message #1830767 is a reply to message #1830748]

Mon, 03 August 2020 14:52

Qiran Cong

Messages: 26
Registered: November 2019

Junior Member

I didn't mean adding new attribute for metamodel, I just want to generate the default content of the EMF model. I didn't see what's the meaning of using IDerivedStateComputer in my situation.
I add the stuff by using :
//Query is my emf class
Query q = PlatformFactory.eINSTANCE.createQuery();
resource.getResourceSet().getResources().get(0). add(q);

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Re: How to programmtically add EObject into Resource [message #1830771 is a reply to message #1830767]

Mon, 03 August 2020 16:42

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Did you read the linked article ?
Iderivredstate computer allows you to derive state (aka create new objects)
Based on the parsed one.
In you case you would add a query

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

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Re: How to programmtically add EObject into Resource [message #1830779 is a reply to message #1830771]

Mon, 03 August 2020 19:15

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

HI

Like Christian I don't really understand what you want.

Another approach to adding extras to a model is to define a derived property and in your manual implementation of that property's getter you can create it and as much else that you like.

(In QVTd I could use this to autocreate the "this" variable, but in practice I prefer to exert more manual control, so you might look to do it in a controlled rather than automatic fashion. "automatic" can go adrift when you copy.)

Regards

Ed Willink

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