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succesive "collect" [message #483218]

Mon, 31 August 2009 15:57

debutante

Messages: 6
Registered: July 2009

Junior Member

Good afternoon,

can we applicate two succesive "collect" like this

"classes <-
DSLC!StructureElement.allInstances()->collect(e|e.chapiter='true')- >collect(c
| thisModule.SE2C(c) )"

thank you

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Re: succesive "collect" [message #483448 is a reply to message #483218]

Tue, 01 September 2009 15:47

William Piers

Messages: 301
Registered: July 2009

Senior Member

Hello,

In fact, collect() will return a Sequence of Sequences. So to iterate
over all elements, despite the fact that they are contained by sub
sequences, you have to call the flatten() function first (see
http://wiki.eclipse.org/ATL/User_Guide#Sequence_data_type_op erations for
details).

e.g. in your case:

classes <- DSLC!StructureElement.allInstances()
-> collect(e|e.chapiter) -> flatten()
-> collect(c | thisModule.SE2C(c) )

Best regards,

William

debutante a écrit :
> Good afternoon,
>
> can we applicate two succesive "collect" like this
>
> "classes <-
> DSLC!StructureElement.allInstances()->collect(e|e.chapiter='true')- >collect(c
> | thisModule.SE2C(c) )"
>
> thank you
>

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Re: succesive "collect" [message #483504 is a reply to message #483448]

Tue, 01 September 2009 19:03

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi William

The specification for an OCL collect is that it flattens to a non-unique
variant of the individual returns.

Regards

Ed Willink

William Piers wrote:
> Hello,
>
> In fact, collect() will return a Sequence of Sequences. So to iterate
> over all elements, despite the fact that they are contained by sub
> sequences, you have to call the flatten() function first (see
> http://wiki.eclipse.org/ATL/User_Guide#Sequence_data_type_op erations for
> details).
>
> e.g. in your case:
>
> classes <- DSLC!StructureElement.allInstances()
> -> collect(e|e.chapiter) -> flatten()
> -> collect(c | thisModule.SE2C(c) )
>
> Best regards,
>
> William
>
> debutante a écrit :
>> Good afternoon,
>>
>> can we applicate two succesive "collect" like this
>>
>> "classes <-
>> DSLC!StructureElement.allInstances()->collect(e|e.chapiter='true')- >collect(c
>> | thisModule.SE2C(c) )"
>>
>> thank you
>>

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