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[news.eclipse.modeling.gmt] Re: [Epsilon]cloning a model element in EOL
This is the approach I have adopted, yet I was wondering if there is any way of copying the references and attributes without having to do that one-by-one, in a more generic manner. But I suppose that is far more practical for immediate use.

Thank you very much,
Kimon

O/H Dimitrios Kolovos έγραψε: 
Hi Kimon,

Say you have

class A {
  attr String a1;
  ref A[*] referenced;
  val A[*] contained[*];
}

To create a copy you should define an operation like this:

operation A createCopy() {
  var n : new A;
  n.a1 := self.a1;
  n.referenced := self.referenced;
  for (contained in self.contained) {
    n.contained.add(contained.createCopy());
  }
  return n;
}

Now if you need to have a generic operation that creates a copy of any element, you should use EMF reflection - but in this case it is simpler (and safer) to just use the EcoreUtil.copy method mentioned previously.

Cheers,
Dimitris

Kimon Polychroniadis wrote:
So, let's suppose there is model element A of type TypeOfA , and I wish to create a copy.
Isn't it possible to create a copy in a more 'manual' manner, with the following the steps below:

1. create a new element e.g. B := new TypeOfA;

2. copy A's attributes and feature values one by one (looping through the attributes and features of A, B(.

3. move B in the container of choice.

However, I am not sure as to how I should reference the atttributes and features of A (and their values).

I realise the solution (if feasible) is a bit 'brute force' but it's a relatively small model I 've got, so I don't think performance would be an issue.

Thanks,
Kimon

O/H Dimitrios Kolovos έγραψε: 
Hi Kimon,

Thanks for submitting https://bugs.eclipse.org/bugs/show_bug.cgi?id=246352

I'll look into it shortly.

Cheers,
Dimitris

Dimitrios Kolovos wrote: 
Hi Kimon,

There is currently no built-in operation for copying model elements in EOL; however this seems to be a useful addition. Could you please open a feature request in the bugzilla?

As a temporary workaround you can use the (static) EcoreUtil.copy(EObject eObject) method which does exactly that. You'll need to create a new Epsilon tool and add a copy(EObject) operation that delegates to the respective operation of the EcoreUtil class.

Cheers,
Dimitris

Kimon Polychroniadis wrote: 
Hi,

I am trying to copy an element of my model in another container in the
model. For example I got element A in container C1 and I want to make a
copy of A (e.g. B) in another container (e.g. C2). So the goal is to
have A in C1 and B in C2, wiht A and B being identical.

However, I noticed that the ':= ' operator moves the object rather
copying it. I also thought of using the clone() command, manipulating the element as a Collection, no result. Is there a more rational way of doing this?

Thank you in advance,
Kimon