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Defining queries in AQL? [message #1714049]

Mon, 09 November 2015 14:51

Wilbert Alberts

Messages: 209
Registered: June 2010

Senior Member

Hi,

I did some steps in migrating the acceleo services in an editor to AQL.

In general that process went rather smooth. However I encountered one situation where I saw an advantage of the Acceleo services over (the current implementation of) AQL.

In order to represent attributes of a class like concept, I created an Acceleo query providing the textual representing. However, that representation could become rather complex which resulted into decomposing the query into multiple ones.

Example:

[query public getRepresentation(c : MultiplicityConstant) : String = 
c.name + ' = ' + c.value.getExprRepr()
/]

[query public getExprRepr(e: Expression) : String = 
if (e=null) or (e.oclIsUndefined())
then
    'undefined'
else
    if e.oclIsTypeOf(IntegerLiteral) 
        ...
    endif
endif
/]

Then I invoke getRepresentation() from my VSP.

If I would like to do things like this using AQL, I need the ability to define AQL modules that contain queries like described above.

Are there any plans to support something like this?

Greetings,
Wilbert.

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Re: Defining queries in AQL? [message #1714142 is a reply to message #1714049]

Tue, 10 November 2015 08:45

Florian Barbin

Messages: 270
Registered: August 2010

Senior Member

Hi Wilbert,

The purpose of AQL is to provide a "lightweight" Query Language for
interpreted expressions. AQL is a sub-part of Acceleo project and is not
intended to replace it as a Model To Text implementation.
For really complex queries, I recommend you to delegate the job to an
external java service.

Regards,

--
Florian - Obeo

Need training or professional services for Sirius?
http://www.obeodesigner.com/sirius

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Re: Defining queries in AQL? [message #1714186 is a reply to message #1714142]

Tue, 10 November 2015 14:57

Wilbert Alberts

Messages: 209
Registered: June 2010

Senior Member

Hi Florian,

Thanks for your answer. I understand the positioning of AQL a little bit better now. Still I appreciate the ability to express certain queries in OCL over the ability to code them into java. Luckily that remains possible (for the time being).

Greetings,
Wilbert.

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