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[ATL] Avoid duplicate entries in target model [message #959271]

Fri, 26 October 2012 15:31

Tomás Ruiz-López

Messages: 12
Registered: October 2012
Location: Dallas

Junior Member

Dear community members,

I am pretty new to ATL but I have already done some successful experiments with it. However, I'm having a concern with my last experiment. When I am applying a transformation rule, I am obtaining duplicated instances in the target model. This is due to the fact that several instances of the source model map to the same instance of the target model, but add some new contents to it.

Nevertheless, what I obtain is that a new instance in the target model is created for each source element. Is there any possible way to check if the target element has already been created, and if so, take it and add it some extra features? I know the semantics of QVT Relations work like that, but I would like to know how this works on ATL.

I hope to be clear. Any help would be appreciated.

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Re: [ATL] Avoid duplicate entries in target model [message #960037 is a reply to message #959271]

Sat, 27 October 2012 05:53

Ed Willink

Messages: 6001
Registered: July 2009

Senior Member

Hi

Please use the ATL newsgroup/forum for ATL discussion.

This is a FAQ; you will find many answers.

I'm not an ATL user, so I cannot remember the exact syntax, but there is
an idiom specifically for this problem. Read the documentation.

Regards

Ed Willink

On 26/10/2012 20:32, Tomás Ruiz-López wrote:
> Dear community members,
>
> I am pretty new to ATL but I have already done some successful
> experiments with it. However, I'm having a concern with my last
> experiment. When I am applying a transformation rule, I am obtaining
> duplicated instances in the target model. This is due to the fact that
> several instances of the source model map to the same instance of the
> target model, but add some new contents to it.
>
> Nevertheless, what I obtain is that a new instance in the target model
> is created for each source element. Is there any possible way to check
> if the target element has already been created, and if so, take it and
> add it some extra features? I know the semantics of QVT Relations work
> like that, but I would like to know how this works on ATL.
>
> I hope to be clear. Any help would be appreciated.

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