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EMF Compare get Object Attributes [message #1062893]

Tue, 11 June 2013 05:27

des 627
Messages: 15
Registered: March 2013

Junior Member

Hi there.
I've been working on my project with EMF Compare and for my purpose I need to get the name of the Object where there is a difference between two textual models.

I'd really appreciate any help from you.

Regards.

[Updated on: Thu, 13 June 2013 13:28]

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Re: EMF Compare get Object Attributes [message #1063429 is a reply to message #1062893]

Thu, 13 June 2013 03:25

Laurent Goubet
Messages: 1583
Registered: July 2009

Senior Member

Hi,

I have no idea what you're trying to achieve, but I guess what you want is to retrieve info about the target of a diff. With EMF Compare 1, you will have to cast to the proper diff type (ModelElementChangeRightTarget, ModelElementChangeLeftTarget, ...), use the getter for the target element (getRightElement, getLeftElement, ...) and navigate from that element to the info you seek : getClass(), getName(), etc.

You should switch to EMF Compare 2, since exploiting the comparison result is much easier now :

IComparisonScope scope = EMFCompare.createDefaultScope(resourceSet1, resourceSet2);
Comparison comparison = EMFCompare.builder().build().compare(scope);

List<Diff> differences = comparison.getDifferences();
for (Diff diff : differences) {
	if (diff instanceof ReferenceChange) {
		EObject changed = ((ReferenceChange)diff).getValue();
		System.out.println("Changed EObject '" + changed.getName() + "' of type : " + changed.getClass());
	}
}

Laurent Goubet
Obeo

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Re: EMF Compare get Object Attributes [message #1066102 is a reply to message #1063429]

Sun, 30 June 2013 12:54

Hans 17
Messages: 2
Registered: June 2013

Junior Member

Hi guys.

I also have some question about this topic. In my case I need to get the 2 objects where there was a change on different attributes. But until now everything seems to be workless.

[Updated on: Thu, 18 July 2013 11:48]

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Re: EMF Compare get Object Attributes [message #1066353 is a reply to message #1066102]

Tue, 02 July 2013 05:35

Laurent Goubet
Messages: 1583
Registered: July 2009

Senior Member

Hans,

You may want to look at a few java tutorials before trying to tackle Eclipse plugin development.

What you have here is a very basic exception, which tells you (straight from the documentation of "ClassCastException") :
Quote:

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. For example, the following code generates a ClassCastException:
Object x = new Integer(0);
System.out.println((String)x);

In this case, you are trying to cast a reference order changed as an UpdateAttribute, while "UpdateAttribute" has no relation to a ReferenceChange whatsoever.

Laurent Goubet
Obeo

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Re: EMF Compare get Object Attributes [message #1070761 is a reply to message #1066353]

Thu, 18 July 2013 11:54

Hans 17
Messages: 2
Registered: June 2013

Junior Member

Laurent thanks a lot for your replay and explanation, actually I feel a little embarrassed...

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