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[Acceleo]Collections of Collections on Queries [message #500602]

Thu, 26 November 2009 21:44

Eclipse User

Hi

Is it possible to use collections of collections as return of a query? i've tried the code below, but the type 'Sequence(Sequente(T))' is Invalid.

[query public packages2(input : MetaComponent) : Sequence(Sequence(T)) =
input.properties->iterate(item : Property; res : Sequence(Sequence(String)) = Sequence{Sequence{}} | res->append(
item.type.ancestors(Package)->iterate(pack : Package; retur : Sequence(String) = Sequence{} | retur->append(pack.name))
)) /]

And what about the initialization of a collection of collection? i've tried 'Sequence{Sequence{}}', but i dont know if it is right.

thanks

[Updated on: Fri, 27 November 2009 08:58] by Moderator

Re: Collections of Collections on Queries [message #500640 is a reply to message #500602]

Fri, 27 November 2009 04:33

Eclipse User

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Hi Andre,

You can initialize sequences containing Sequence like you described here
: "Sequence{Sequence{'a', 'b'}, Sequence{'c'}}" is perfectly legal.

However, the current implementation of OCL will prevent you from using
Sequences typed with Sequences : "Sequence(Sequence(String))" is
illegal. That means you cannot define Acceleo queries returning such
sequences, and you cannot cast to them either "Sequence{Sequence{'a',
'b'}, Sequence{'c'}}.oclAsType(Sequence(Sequence(String)))" will fail in
compilation error.

Laurent Goubet
Obeo

Andre wrote:
> Hi
>
> Is it possible to use collections of collections as return of a query?
> i've tried the code below, but the type 'Sequence(Sequente(T))' is Invalid.
>
> [query public packages2(input : MetaComponent) : Sequence(Sequence(T)) =
> input.properties->iterate(item : Property; res :
> Sequence(Sequence(String)) = Sequence{Sequence{}} | res->append(
> item.type.ancestors(Package)->iterate(pack : Package; retur :
> Sequence(String) = Sequence{} | retur->append(pack.name))
> )) /]
>
>
> And what about the initialization of a collection of collection? i've
> tried 'Sequence{Sequence{}}', but i dont know if it is right.
>
> thanks
>

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Re: Collections of Collections on Queries [message #500687 is a reply to message #500640]

Fri, 27 November 2009 09:10

Eclipse User

Hi Laurent

is it possible to call a query A inside of a query B?

something like:
[query queryA(s : String) : String = s.concat(';') /]
[query queryB(s : Sequence(T) ) : Sequence(T) =
s->iterate( item : String; ret : Sequence(String) = Sequence{} | ret->append ( queryA(item.toString()) )) /]

When i do this, an error occours on query B:
Invalid Operation Signature (queryA(String))

thanks

Re: Collections of Collections on Queries [message #500696 is a reply to message #500687]

Fri, 27 November 2009 09:41

Eclipse User

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Andre,

This is possible, and should work as you did. The only potential
explanation I see is that the compiler mixes up a custom "String"
classifier you have in your metamodel (or the UML "String" for that
matter) with the OCL String.

In this :
"queryA(s : String)" if you ctrl+click on "String", does it open the
"oclstdlib.ecore" model on "String"?

and same question on
"item.toString()" : which "toString()" is called? Is its return type the
same "String" as just above?

If none of what I say makes sense to you, could you provide us with the
module that fails to compile?

Laurent Goubet
Obeo

Andre wrote:
> Hi Laurent
>
> is it possible to call a query A inside of a query B?
>
> something like:
> [query queryA(s : String) : String = s.concat(';') /]
> [query queryB(s : Sequence(T) ) : Sequence(T) = s->iterate( item :
> String; ret : Sequence(String) = Sequence{} | ret->append (
> queryA(item.toString()) )) /]
>
> When i do this, an error occours on query B: Invalid Operation Signature
> (queryA(String))
>
> thanks
>

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--------------060204080005070409050606--

Re: Collections of Collections on Queries [message #500789 is a reply to message #500696]

Sat, 28 November 2009 13:34

Eclipse User

Laurent

"queryA(s : String)" if you ctrl+click on "String", does it open the
"oclstdlib.ecore" model on "String"?
Yes, it is.

The problem was solved by calling oclAsType(String), instead of toString(). The code below is working:

[query queryA(s : String) : String = s /]
[query queryB(seq : Sequence(T) ) : Sequence(T) =
seq->iterate( item; ret : Sequence(String) = Sequence{} | ret->append ( queryA(item.oclAsType(String)) )) /]

thanks a lot,

Re: Collections of Collections on Queries [message #500794 is a reply to message #500789]

Sat, 28 November 2009 14:53

Eclipse User

Hi

Based on this problem and other tests, i've concluded that on queries like these, when a query calls another, the error message is always 'Invalid Operation Signature', even when there is another type of error subsequent on the query. So, the developer thinks that the problem is on the call to the other query, when it isn't.

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