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[EMF Compare] what about cross-references of a merged eObject ? [message #137012]

Tue, 09 June 2009 11:56

Chetan Kumar

Messages: 44
Registered: July 2009

Member

Hi,

I am doing some trails on EMF Compare with the EMF ExtLibrary example.
When we select an object from the right-side to copy on to the left-side
(using the Compare UI) ... the cross-references of the old object are not
reflected on its copy.

Let's say there are 2 library instances.
Litrary01 (leftside): no books
Library02: has a book which is associated with an author.
When i copy the book from right to left, the author is not included. It
seems fine but infact i feel the merge can be more smart in copying the
cross-references of the copy object to the destination tree.

Does EMF Compare provide such a merge functionality off the shelf ? or
can we use an extension-point to tweak only this part of the merge.

- Chetan Kumar

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Re: [EMF Compare] what about cross-references of a merged eObject ? [message #137072 is a reply to message #137012]

Tue, 09 June 2009 16:27

Laurent Goubet

Messages: 1902
Registered: July 2009

Senior Member

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Hi Chetan,

This behavior is intentional. We don't copy cross references to non
existing objects (some people might want it, some others not as all use
cases don't apply to one case or the other).

If you copy the book, its reference towards an author is not copied
alongside it. If you then copy the author, the reference should be
restored as it should.

You can tweak this part of the merge by overriding the existing mergers
(see extension point org.eclipse.emf.compare.diff.mergerprovider ).

Laurent Goubet
Obeo

Chetan Kumar a

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Re: [EMF Compare] what about cross-references of a merged eObject ? [message #137248 is a reply to message #137072]

Sun, 14 June 2009 18:07

Chetan Kumar

Messages: 44
Registered: July 2009

Member

Hello Laurent,

Thank you for yer response.
That makes sense.

laurent Goubet wrote:

> Hi Chetan,

> This behavior is intentional. We don't copy cross references to non
> existing objects (some people might want it, some others not as all use
> cases don't apply to one case or the other).

> If you copy the book, its reference towards an author is not copied
> alongside it. If you then copy the author, the reference should be
> restored as it should.

> You can tweak this part of the merge by overriding the existing mergers
> (see extension point org.eclipse.emf.compare.diff.mergerprovider ).

> Laurent Goubet
> Obeo

> Chetan Kumar a écrit :
>> Hi,
>>
>> I am doing some trails on EMF Compare with the EMF ExtLibrary example.
>> When we select an object from the right-side to copy on to the left-side
>> (using the Compare UI) ... the cross-references of the old object are
>> not reflected on its copy.
>>
>> Let's say there are 2 library instances.
>> Litrary01 (leftside): no books
>> Library02: has a book which is associated with an author. When i copy
>> the book from right to left, the author is not included. It seems fine
>> but infact i feel the merge can be more smart in copying the
>> cross-references of the copy object to the destination tree.
>>
>> Does EMF Compare provide such a merge functionality off the shelf ? or
>> can we use an extension-point to tweak only this part of the merge.
>>
>> - Chetan Kumar
>>
>>

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