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Using a integer iterator [message #1101426]

Wed, 04 September 2013 08:52

Federico Toledo
Messages: 93
Registered: April 2012
Location: Ciudad Real, Spain

Member

Hi everyone!

I need to iterate a certain number of times, according with the integer value of an attribute.

Let's say that I have an object 'A' with an attribute 'int_att', and I'd like to create as many 'B' as indicated by this attribute.

I found a solution, but I want to know if there is a better way, because I was looking in the documentation and in the forum with no luck.

First I create a collection to have something to iterate

helper def : getCollectionFrom1to(i:Integer) : Collection(Integer) = 
	if i>1 
        then 
             thisModule.getCollectionFrom1to(i-1)->including(i) 
        else 
             Sequence{1} 
        endif;

Then I iterate this collection doing what I need

for (it in thisModule.getCollectionFrom1to(A.int_att)) {
     thisModule.createB(A);
}

Thank you in advance for any feedback

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Re: Using a integer iterator [message #1101455 is a reply to message #1101426]

Wed, 04 September 2013 09:26

Ed Willink
Messages: 3446
Registered: July 2009

Senior Member

Hi

The idiom is

Sequence{1..N}->....

Regards

Ed Willink

On 04/09/2013 13:52, Federico Toledo wrote:
> Hi everyone!
>
> I need to iterate a certain number of times, according with the
> integer value of an attribute.
> Let's say that I have an object 'A' with an attribute 'int_att', and
> I'd like to create as many 'B' as indicated by this attribute.
> I found a solution, but I want to know if there is a better way,
> because I was looking in the documentation and in the forum with no luck.
>
> First I create a collection to have something to iterate
>
> helper def : getCollectionFrom1to(i:Integer) : Collection(Integer) =
> if i>1 then
> thisModule.getCollectionFrom1to(i-1)->including(i) else
> Sequence{1} endif;
>
>
> Then I iterate this collection doing what I need
>
> for (it in thisModule.getCollectionFrom1to(A.int_att)) {
> thisModule.createB(A);
> }
>
>
>
> Thank you in advance for any feedback

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Re: Using a integer iterator [message #1101469 is a reply to message #1101455]

Wed, 04 September 2013 09:51

Federico Toledo
Messages: 93
Registered: April 2012
Location: Ciudad Real, Spain

Member

I guess it is not implemented because it does not compile...
thank you!

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Re: Using a integer iterator [message #1102458 is a reply to message #1101469]

Thu, 05 September 2013 15:46

Dennis Wagelaar
Messages: 100
Registered: September 2012

Senior Member

Op 04-09-13 15:51, Federico Toledo schreef:
> I guess it is not implemented because it does not compile...
> thank you!

You're right: ATL syntax does not support the OCL range idiom, so ATL cannot
parse it. For regular ATL, your solution is fine.

Note that ATL/EMFTVM introduces a separate operation for including ranges into
a Collection, which is implemented lazily: Collection::includingRange(start :
Integer, end : Integer) : Collection. It does not actually store the whole
range of numbers, but just generates numbers as the collection is evaluated.

Regards,
Dennis

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