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Home » Archived » M2M (model-to-model transformation) » [QVTO] building OCL Query in qvto

[QVTO] building OCL Query in qvto [message #468027]

Mon, 03 August 2009 13:04

Eclipse User

Hello,
I know that QVT uses OCL to qurey its models..
I am trying to build an OCL Query to select some elements from a UML
model.

I am using something like that.. :
Model.objects()[Class]-> select ( c: Class | c.name='myClass');

However, the expression inside the select statemetn will depend on some
input taken from the user. I tried storing the expression "c: Class |
c.name='myClass'" in a variable and use the variable inside the select
statement like this:

var exp=c: Class | c.name='myClass';
Model.objects()[Class]-> select ( exp);

but it didnt work..

Also I tried using the query package from the OCL metamodel but I keep
getting error message when i try to declare a variable of that type
(OCL::query::Query)

Any help will be appretiated..

Thanks..

Re: [QVTO] building OCL Query in qvto [message #468065 is a reply to message #468027]

Mon, 03 August 2009 17:18

Eclipse User

Hi mary ,

See some replies in-line, below.

Regards,
Sergey

mary wrote:
> Hello,
> I know that QVT uses OCL to qurey its models..

QVTo metamodel is built on top of OCL metamodel and provides OCL
extensions with side effects. QVTo metamodel utilize Ecore binding of
generic OCL metamodel from org.eclipse.ocl plug-in.

> I am trying to build an
> OCL Query to select some elements from a UML model.
> I am using something like that.. :
> Model.objects()[Class]-> select ( c: Class | c.name='myClass');
>
> However, the expression inside the select statemetn will depend on some
> input taken from the user. I tried storing the expression "c: Class |
> c.name='myClass'" in a variable and use the variable inside the select
> statement like this:
> var exp=c: Class | c.name='myClass';
> Model.objects()[Class]-> select ( exp);
>
> but it didnt work..

As far as I understand you'd like to declare some sort of closure object.
What about using simple helper for that purpose like:

helper Class::isMyClass() : Boolean = self.name = 'myClass';

so that it can be used in select operation like:

main() {
Model.objects()[Class]->select(isMyClass());
}

However I didn't quite catch what do you by "will depend on some input
taken from the user". Is that input comes from configuration property?
Or from some model element? And how that requirement should be reflected
in script composition?

> Also I tried using the query package from the OCL metamodel but I keep
> getting error message when i try to declare a variable of that type
> (OCL::query::Query)

Query class comes from old OCL metamodel (with
'http://www.eclipse.org/OCL2/1.0.0/ocl' NsURI). You can declare
appropriate modeltype and create Query object as follows:

modeltype ocl2 uses "http://www.eclipse.org/OCL2/1.0.0/ocl";
transformation MyTransformation();
main() {
var v := object ocl2::_query::Query {};
}

But it's useless since there's no way to specify query text.

Possible solution it to wrap handling of Query object with some
black-box Java library. However I don't see reasons to use it in place
of regular helpers.

>
> Any help will be appretiated..
>
> Thanks..
>
>
>
>
>
>

Re: [QVTO] building OCL Query in qvto [message #468086 is a reply to message #468065]

Mon, 03 August 2009 23:30

Eclipse User

Hi Sergey,

Thanks for your reply ..

What i mean by user input is that it will be taken from an element in the
user model. (a tagged value)
So the constraint is going to depend on that value. for instance in the
previous example the OCL constraint self.name='myClass' is going to be
different depending on the value of the tagged value.
for example it can be self.ownedattribute=**** or self.operation=****

I think the helper method wont be useful since self.name='myClass' is
going to be read from a model element and stored in a variable.. so if i
put

helper Class::isMyClass() : Boolean = expression;

and i define expression as a variable:

var expression:= self.name = 'myClass';

The value of the OCL expression will be evaluated right away, and not
evaluated in the helper method?

About the query object i was quite surprised that there is no way to
specify the query text..What is the use of the query object in this case?

Also about the use of java as black-box, I was looking for some examples
that shows how we can call java methods from qvt but unfortunately i
couldn't find any... can u give me some examples or references.?

Thanks again..
Mary,

Re: [QVTO] building OCL Query in qvto [message #468134 is a reply to message #468086]

Tue, 04 August 2009 06:32

Eclipse User

This is a multi-part message in MIME format.
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Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Content-Transfer-Encoding: 7bit

Hi mary ,

See some replies in-line, below.

Regards,
Sergey

mary wrote:
> Hi Sergey,
>
> Thanks for your reply ..
>
> What i mean by user input is that it will be taken from an element in
> the user model. (a tagged value)
> So the constraint is going to depend on that value. for instance in the
> previous example the OCL constraint self.name='myClass' is going to be
> different depending on the value of the tagged value.
> for example it can be self.ownedattribute=**** or self.operation=****

You mean that constraint in your case might be an arbitrary OCL expression?
You can consider using derived feature that is annotated with OCL to
provide the required value/behavior in workspace models.
User model can define some feature (attribute, operation) annotated with
OCL expression text that will be later evaluated by QVTo.
Attached QVTo project contains an example of defining and using such
features.

>
> I think the helper method wont be useful since self.name='myClass' is
> going to be read from a model element and stored in a variable..
> so if i put
>
> helper Class::isMyClass() : Boolean = expression;
>
> and i define expression as a variable:
> var expression:= self.name = 'myClass';
>
> The value of the OCL expression will be evaluated right away, and not
> evaluated in the helper method?

I see. There's no way to explicitly create and evaluate OCL expression
from the text string directly in QVTo source.

>
> About the query object i was quite surprised that there is no way to
> specify the query text..What is the use of the query object in this case?

I suspect that it was not intended to be used as model element. Rather
it might be used as interface for OCL expression evaluation from Java.
However for such case it's better look at org.eclipse.ocl.Query class
and its descendants.

>
> Also about the use of java as black-box, I was looking for some examples
> that shows how we can call java methods from qvt but unfortunately i
> couldn't find any... can u give me some examples or references.?

That was answered a few posts above. Look at
http://www.eclipse.org/newsportal/article.php?id=4560&gr oup=eclipse.modeling.m2m#4560

>
> Thanks again.. Mary,
>
>
>

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Re: [QVTO] building OCL Query in qvto [message #468246 is a reply to message #468134]

Tue, 04 August 2009 12:28

Eclipse User

Hi Sergey,
Thank you again for your help.

However, the attached file seems to be courpted.. When i opened it, it was
not readable.. Can you please try to send it again..?
Mary

Re: [QVTO] building OCL Query in qvto [message #468271 is a reply to message #468246]

Tue, 04 August 2009 14:45

Eclipse User

This is a multi-part message in MIME format.
--------------050709010105040106030503
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Content-Transfer-Encoding: 7bit

Repeated.
It's zipped Eclipse project. Save and unzip it.

mary wrote:
> Hi Sergey, Thank you again for your help.
> However, the attached file seems to be courpted.. When i opened it, it
> was not readable.. Can you please try to send it again..?
> Mary
>
>

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Re: [QVTO] building OCL Query in qvto [message #468300 is a reply to message #468271]

Tue, 04 August 2009 19:17

Eclipse User

again its not working. when i extract, it generates only one file called
qvto2 and when i open this file i only find garbage.. "non readable" :(

BTW, is the black-box support available for older versions of qvto ? i am
using version 1.0.1. ?

Re: [QVTO] building OCL Query in qvto [message #468411 is a reply to message #468300]

Wed, 05 August 2009 08:55

Eclipse User

mary wrote:
> again its not working. when i extract, it generates only one file called
> qvto2 and when i open this file i only find garbage.. "non readable" :(

Could you please mail me to 'sboyko at borland dot com' so that I send
this plug-in.

>
> BTW, is the black-box support available for older versions of qvto ? i
> am using version 1.0.1. ?

Yes, version 1.0.1 supports black-box as well.
But that implementation requires some metainfo declared in Java library
sources. Also extension point for library registration was changes since
1.0.1. I'd better move to latest 2.0.0 version.

That old format described in post
http://dev.eclipse.org/newslists/news.eclipse.modeling.m2m/m sg02375.html

>
>
>
>

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