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[ATL] Consolidate multiple input elements into one output element [message #519320]

Mon, 08 March 2010 14:09

Marten Sijtema

Messages: 67
Registered: November 2009

Member

Hello!

I have troubles getting my head around the following problem:

Suppose i have:

-input metamodel mmA
-output metamodel mmB

mmA contains an element A, so an instance of mmA (=mA) can have multiple A elements. I would like to transform this to 1 B element, consolodating (ie. union) attributes etc. from the A's.

What is the best strategy for doing something like this? Because selecting on A yields multiple matches, but i want, for multiple matches, 1 'to' clause.

Hope someone can help me out with this.

My company: Sytematic, building business software from models.

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Re: [ATL] Consolidate multiple input elements into one output element [message #521935 is a reply to message #519320]

Fri, 19 March 2010 11:31

No real name

Messages: 1
Registered: March 2010

Junior Member

Hi Marten, hi all,

I have the same problem, I need to consolidate multiple input elements into one output variable (a string having input elements attached by means of the + symbol), do you know now how to dolve it, I will wonder if you can help me, please, is very important and urgent.
thak you very much in advance.
my email is raul.mazo@hotmail.com

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Re: [ATL] Consolidate multiple input elements into one output element [message #521949 is a reply to message #519320]

Fri, 19 March 2010 07:26

Vincent MAHE

Messages: 129
Registered: July 2009

Senior Member

Marten Sijtema a écrit :
> Hello!
>
> I have troubles getting my head around the following problem:
>
> Suppose i have:
>
> -input metamodel mmA
> -output metamodel mmB
>
> mmA contains an element A, so an instance of mmA (=mA) can have multiple
> A elements. I would like to transform this to 1 B element, consolodating
> (ie. union) attributes etc. from the A's.
>
> What is the best strategy for doing something like this? Because
> selecting on A yields multiple matches, but i want, for multiple
> matches, 1 'to' clause.
>
> Hope someone can help me out with this.

As ATL is declarative, think through SET approach.

You want:
{a1, a2, ... an} -> {b}

so you may try writing a rule using 'allInstances' which gives you a set
as input of the rule and then 'each' function on it to compute 'b'....
--
Cordialement

Vincent MAHÉ

Ingénieur plate-forme - Cesar/Artemisia - Équipe Espresso
IRISA-INRIA, Campus de Beaulieu, 35042 Rennes cedex, France
Tél: +33 (0) 2 99 84 71 00, Fax: +33 (0) 2 99 84 71 71

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Re: [ATL] Consolidate multiple input elements into one output element [message #524498 is a reply to message #519320]

Thu, 01 April 2010 07:55

Marten Sijtema

Messages: 67
Registered: November 2009

Member

I fixed it. I created a helper that queries over the source model, and puts the result of this query in a sequence. The helper is called from the using { } section of a normal rule, and the result is put in a variable, and then added to an element from the 'to' section.

thanks for the help.

My company: Sytematic, building business software from models.

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