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Only one Edge between two nodes [message #1707173]

Wed, 02 September 2015 14:52

Eclipse User

Hello,

I'am working on an extended Version of Petri Nets (new edge types, new nodes).

I've implemented the needed creation Tools but now I can create two edges with the same source and target. Is there an easy way to restrict it or do I have to use Condition Expressions in the creation tool?

EMF diagram and an example are attached.

Thank you in advance!
Best regards,
Alex

Attachment: Beispiel.JPG
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Attachment: EMF.JPG
(Size: 45.78KB, Downloaded 229 times)

[Updated on: Wed, 02 September 2015 14:54] by Moderator

Re: Only one Edge between two nodes [message #1707919 is a reply to message #1707173]

Thu, 10 September 2015 10:06

Eclipse User

Le 02/09/2015 20:52, Alexander Schledewitz a écrit :
> Hello,
>
> I'am working on an extended Version of Petri Nets (new edge types, new
> nodes).
>
> EMF:
>
I guess you forgot the image here ...
>
> I've implemented the needed creation Tools but now I can create two
> edges with the same source and target. Is there an easy way to restrict
> it or do I have to use Condition Expressions in the creation tool?
> Example:
.... and here
>
>
> Thank you in advance!
> Best regards,
> Alex

Re: Only one Edge between two nodes [message #1707977 is a reply to message #1707919]

Fri, 11 September 2015 03:39

Eclipse User

Le 10/09/2015 16:06, Laurent Fasani a écrit :
> Le 02/09/2015 20:52, Alexander Schledewitz a écrit :
>> Hello,
>>
>> I'am working on an extended Version of Petri Nets (new edge types, new
>> nodes).
>>
>> EMF:
>>
> I guess you forgot the image here ...
>>
>> I've implemented the needed creation Tools but now I can create two
>> edges with the same source and target. Is there an easy way to restrict
>> it or do I have to use Condition Expressions in the creation tool?
>> Example:
> ... and here
>>
>>
>> Thank you in advance!
>> Best regards,
>> Alex
>
oups sorry. The images were attached but i could not see it from
thunderbird.
Yes, use the precondition and use preSource/preSourceView and
preTarget/preTarget to make a condition on what you are about to select.

Regards
Laurent

Re: Only one Edge between two nodes [message #1709147 is a reply to message #1707977]

Thu, 24 September 2015 09:10

Eclipse User

Thank you, it worked Smile

Re: Only one Edge between two nodes [message #1743626 is a reply to message #1709147]

Sat, 17 September 2016 05:42

Eclipse User

Hello,

I have a similar problem. I have tried to fix it by:

aql:preTarget.differs(preSource.outgoings -> filter(target))
or
aql:(preSource.outgoings -> filter (target)) -> excludes (preTarget)

But it doesn't work.
Does anybody have a hint, where I am thinking wrong?

Cheers, Xing

[Updated on: Sat, 17 September 2016 09:29] by Moderator

Re: Only one Edge between two nodes [message #1743635 is a reply to message #1743626]

Sat, 17 September 2016 08:42

Eclipse User

Hi

You provide no repro so ...

Have you checked the source syntax errors? "filter" takes an OclType argument and "target" does not look like a type.

The isUnique iteration can help make uniqueness constraints readable.

Regards

Ed Willink

Re: Only one Edge between two nodes [message #1743638 is a reply to message #1743635]

Sat, 17 September 2016 09:30

Eclipse User

Hello Ed,

thanks for the answer.
I was referring to the example EMF from above.

But now I fixed it by:

aql:not(preSource.outgoings.target->exists(s | s = preTarget))

Is that ok, or is it not very elegant?

Do I put it in the Node Representation Precondition or the Node Creation Representation?
Because when I go with the curser over the ? of the Node Representation Precondition, it also says "Prevent Creation of the Element", but that is referring to the view, is that correct?

Cheers, Xing

Re: Only one Edge between two nodes [message #1744872 is a reply to message #1743638]

Sat, 01 October 2016 03:14

Eclipse User

Hello,

I am referring in the following to Alexander's EMF model.
The expression I presented in my last post works perfectly.

But I still get an error:

Description: Feature outgoings not found in EClass EObject
Location Problem: EMF Problem

Can I just ignore it? Because it does work exactly how I want it to work. So obviously my expression and therefore "outgoings" must be working, so it mus be found somewhere. And the error does not effect me.

Thank you
Xing

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