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OCL Query format [message #494775]

Mon, 02 November 2009 15:42

pkojo

Messages: 27
Registered: October 2009

Junior Member

Hi,

This is a query which gives number of classes in a model:
getModel().allOwnedElements()->select(oclIsTypeOf(Class))->size()

Now I want to write this query in another format
context uml::Model::findClass()
body{
allOwnedElements()->select(oclIsTypeOf(Class))->size()
}

is this a right way to write above query, or any one has any other solution for this.

Thanks in advance,

pkojo

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Re: OCL Query format [message #494897 is a reply to message #494775]

Tue, 03 November 2009 06:57

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi pkojo

What you are trying to do looks to be quite conventional, so it is
unclear why you need help.

If you have not tried your example, you should try it before asking for
help.

If you have tried your example, you should clearly explain what problems
you are having.

Since the syntax of body is "body optionalName : oclExpression" rather
than "body optionalName { oclExpression }" it seems clear that you have
not tried your example. The { following body should give you an obvious
syntax error to discuss.

Regards

Ed Willink

pkojo wrote:
> Hi,
>
> This is a query which gives number of classes in a model:
> getModel().allOwnedElements()->select(oclIsTypeOf(Class))->size()
>
> Now I want to write this query in another format context
> uml::Model::findClass()
> body{
> allOwnedElements()->select(oclIsTypeOf(Class))->size()
> }
>
> is this a right way to write above query, or any one has any other
> solution for this.
>
> Thanks in advance,
>
> pkojo
>

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Re: OCL Query format [message #494943 is a reply to message #494897]

Tue, 03 November 2009 10:51

pkojo

Messages: 27
Registered: October 2009

Junior Member

Hi Ed,

I tried query on OCL Interpreter Console, to count classes using
getModel().allOwnedElements()->select(oclIsTypeOf(Class))->size()
This works fine, when I use this query with context key word it gives me errors. I am very new to OCL and trying to understand how it works, I havent found any documentation which gives me hint where I use OCL query with context key word and where not.
In OCL documentation all queries are defined with context key word, if I tried same on OCL interpreter it does not work and it complains about the context key word.

Therefore I tried to compare my above query in context format like this:

context uml::Model::findClass()
body{
allOwnedElements()->select(oclIsTypeOf(Class))->size()
}

It will definitely complain about context keyword on OCL console.
Please little bit explain or refer me any material which explains where we can use context and where we cant.

I am sorry, I am beginner and my question is very basic, I hope you do not mind.

regards,
pokojo

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