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Re: [henshin-user] Match depending on the number of edges
Hi,

one feature that might be useful to implement this are Aggregations. Aggregations can be used to count a number of references of a certain type, just as required in the example: http://www.ckrause.org/2015/11/aggregations-in-henshin.html

However, it might not be possible to implement the full desired behavior in only one rule: the result of counting is only available after the multi-rule used for counting has been matched (which happens chronologically after the matching of the kernel rule, where you already need the count).

You could still implement the behavior by storing the count for each Class1 and later using it for matching. This can be achieved by two rules: The first one counts for each Class1 the number of its Class2 references, and stores that number into an auxiliary object (e.g. a UML annotation, or a Trace object from Henshin's built-in generic Trace meta-model [1]). There should be one such auxiliary object created for each Class1. The second rule takes the desired number of Class2 references as an input parameter, and matches it against the numbers stored in the auxiliary objects.

It's certainly a verbose way to do it. Having counting as a language feature would be an interesting research topic of its own.

[1] https://wiki.eclipse.org/Henshin_Trace_Model

Best regards,
Daniel

Am 26.10.2017 um 17:28 schrieb Zschaler, Steffen:

I see. You may need a higher-order transformation for this, generating the specific rules you want to match. I don’t think you can get this out of the box.

 

Steffen

 

Dr. rer. nat. Steffen Zschaler AHEA

Senior Lecturer

 

King's College London

Department of Informatics

 

Email szschaler@xxxxxxx

Phone +44 (020) 7848 1513

WWW   http://www.steffen-zschaler.de/

 

From: henshin-user-bounces@xxxxxxxxxxx [mailto:henshin-user-bounces@xxxxxxxxxxx] On Behalf Of Juergen Freund
Sent: 26 October 2017 13:54
To: henshin-user@xxxxxxxxxxx
Subject: Re: [henshin-user] Match depending on the number of edges

 

Thank you for your immediate answer.

 

 

I see, I did not declare my matter clearly. Sorry for that.

 

Sure I can match that by explicitly define a rule where Class1 is connected to exactly 2 Class2.

 

What I had in my was more in the direction by making it some kind of generic with for example attribute conditions and input parameters.

 

Sorry for the inconvenience. I hope now it's clearer what I meant.

 

 

Best,

Jürgen

 

-- 

Dipl.-Ing. Jürgen Freund

Arbeitsgruppe Ähnlichkeitsmechanik

 

Telefon: +49 (0)711 685 69530

 

Postadresse:

Universität Stuttgart

Institut für Statik und Dynamik der Luft- und Raumfahrtkonstruktionen

Pfaffenwaldring 27 - Zimmer 01.002

70569 Stuttgart

 

On Thu, 2017-10-26 at 12:34 +0000, Zschaler, Steffen wrote:

That’s exactly what Graph Rules are for. You can just write down exactly the situation that you are after.

 

Steffen

 

Dr. rer. nat. Steffen Zschaler AHEA

Senior Lecturer

 

King's College London

Department of Informatics

 

Email szschaler@xxxxxxx

Phone +44 (020) 7848 1513

WWW   http://www.steffen-zschaler.de/

 

From: henshin-user-bounces@xxxxxxxxxxx [mailto:henshin-user-bounces@xxxxxxxxxxx] On Behalf Of Juergen Freund
Sent: 26 October 2017 13:19
To: Henshin Project user discussions <henshin-user@xxxxxxxxxxx>
Subject: [henshin-user] Match depending on the number of edges

 

Hello Henshin users and developers,

 

 

I just wanted to ask if it possible to construct matching rules which match certain patterns dependent on their number of connected edges?

 

As example:

 

My class diagram:

 

Class1 -- [*] Class2

 

My input model:

 

Class1 connected to 3 Class2.

Class1 -- [3] Class2

 

Class1 connected to 2 Class2.

Class1 -- [2] Class2

 

 

Now I want my rules only to match the pattern where Class1 only has 2 Class2 members.

 

 

Best,

Jürgen

 

 

--

Dipl.-Ing. Jürgen Freund

Arbeitsgruppe Ähnlichkeitsmechanik

 

Telefon: +49 (0)711 685 69530

 

Postadresse:

Universität Stuttgart

Institut für Statik und Dynamik der Luft- und Raumfahrtkonstruktionen

Pfaffenwaldring 27 - Zimmer 01.002

70569 Stuttgart

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