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Undo a Merge [message #1768831]

Mon, 24 July 2017 04:24

Eclipse User

Hello there,

i need to undo a already completed merge. How can i do that?

This is my code:

Registry createStandaloneInstance = IMerger.RegistryImpl.createStandaloneInstance();
IMerger highestRankingMerger = createStandaloneInstance.getHighestRankingMerger(diff);
highestRankingMerger.copyLeftToRight(diff, null);

Now i want to undo the merge. how can i do that? The EMF-Compare Editor is able to achieve this.

Thank you,
Simon

Edit: I probably found a way with help of an ChangeRecorder. Is there a different way? Or is this the best one?

[Updated on: Mon, 24 July 2017 09:20] by Moderator

Re: Undo a Merge [message #1768948 is a reply to message #1768831]

Tue, 25 July 2017 03:46

Eclipse User

I tryed it and it worked. the problem is, that if i make more changes and then reroll them all the egeneric-refernce is lost. any help plz?

Re: Undo a Merge [message #1769859 is a reply to message #1768948]

Fri, 04 August 2017 05:09

Eclipse User

Hi Simon,

The EMF Compare editor uses the help of an IEditingDomain to implement its un/redo actions. That is the most efficient (and less bug-prone) way to achieve this and is probably what you should strive for. I am not sure IEditingDomains can be used standalone since I never had to implement that, you might want to ask on the EMF forum if you don't manage to make it work on your use case.

Laurent Goubet
Obeo

Re: Undo a Merge [message #1771033 is a reply to message #1769859]

Mon, 21 August 2017 07:37

Eclipse User

Hello Laurent, thanks for your response.

i know how to use undo and redo actions with EMF/CommandStack. The problem is, that the merger wont provide or use a command to change the model. Thats the reason i cant undo it.

Re: Undo a Merge [message #1771179 is a reply to message #1771033]

Tue, 22 August 2017 12:09

Eclipse User

Hi Simon,

you are right, the merger modifies the model directly. Have a look at org.eclipse.emf.compare.ide.ui.internal.structuremergeviewer.actions.MergeAction, org.eclipse.emf.compare.domain.impl.EMFCompareEditingDomain and org.eclipse.emf.compare.command.impl.MergeCommand.MergeCommand to see how the merge operation is wrapped within a command that can be undone and redone.

For your usecase, it'd probably be enough to create a change recorder and re-use MergeCommand. You can then undo the merge command based on the change recorder.

Hope this helps!

Best wishes,

Philip

Re: Undo a Merge [message #1771777 is a reply to message #1771179]

Wed, 30 August 2017 06:24

Eclipse User

Hello Phillip, than you for your response.

i tryed to create a MergeCommand but i am not sure about the parameters. i always get a NPE if i try to execute the command.

Can you give me a better explanation for the constructor parameters then the actucal java doc provides?

Thank you

Edit: i got it work. Problem is now, that if i save my model, i get the following error: The object 'org.eclipse.emf.ecore.impl.EGenericTypeImpl@3a199b9a (expression: ?)' is not contained in a resource.

I know that this means that there is an eobject that has still a refernce from the model put is not contained in any parent anymore so the model cant be saved.

[Updated on: Wed, 30 August 2017 07:19] by Moderator

Re: Undo a Merge [message #1771831 is a reply to message #1771777]

Thu, 31 August 2017 04:08

Eclipse User

Hi Simon,

I assume this means you've merged a difference without merging all of its dependencies (or that a post-processor on the model removed one such dependency). I don't really know what kind of merge could give you a dangling EGenericType though...

Could you check that you're merging all differences and not just part of them?

Laurent Goubet
Obeo

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