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OCL constraint: blank character in a string [message #533329]

Thu, 13 May 2010 08:14

Eclipse User

Hi there,

I have a trouble in an OCL constraint that checks the blank characters in a string. I cannot write a constraint using the operations defined on OCL String. Following constraint is not working either. Could anyone help me?

 " not (self.name->includes(' ')) "

....

[Updated on: Thu, 13 May 2010 08:15] by Moderator

Re: OCL constraint [message #533765 is a reply to message #533329]

Sun, 16 May 2010 16:43

Eclipse User

Originally posted by: Alexander.Igdalov.gmail.com

Hi Esin,

I would recommend you to write this operation in Java. Refer to
"Customizing the Environment" section of the OCL Developer Guide (in
Help) for details.

Your statement
> " not (self.name->includes(' ')) "

doesn't check for spaces but converts a String (i.e. self.name) to a Set
of Strings containing one element (self.name) and attempts to find a
String equal to ' '.

HTH,
- Alex.

esin wrote:
> Hi there,
>
> I have a trouble in an OCL constraint that checks the blank characters
> in a string. I cannot write a constraint using the operations defined on
> OCL String. Following constraint is not working either. Could anyone
> help me?
>
>
> " not (self.name->includes(' ')) "
>
>
> ...

Re: OCL constraint [message #533773 is a reply to message #533329]

Sun, 16 May 2010 17:20

Eclipse User

Hi esin

OCL 2.2 adds

String::characters() : Sequence(String)

which breaks a String up into one chaacer per String allowing you to do
what you want.

Unfortunately MDT/OCL does not yet support this function. Should be in
MDT/OCL 4.0.0.

For now, as Alex suggested, you need Java, which will also be much
easier in MDT/OCL 4.0.0.

Regards

Ed Willink

On 13/05/2010 13:14, esin wrote:
> Hi there,
>
> I have a trouble in an OCL constraint that checks the blank characters
> in a string. I cannot write a constraint using the operations defined on
> OCL String. Following constraint is not working either. Could anyone
> help me?
>
>
> " not (self.name->includes(' ')) "
>
>
> ....

Re: OCL constraint [message #533921 is a reply to message #533329]

Mon, 17 May 2010 09:28

Eclipse User

Hi, all,

A less pleasant-looking alternative to Java is:

(1..self.name.size())->collect(i |
self.name.substring(i, i))->excludes(' ')

which basically includes an expansion of the OCL 2.2 characters() operation.

:-)

Christian

On 13/05/10 08:14 AM, esin wrote:
> Hi there,
>
> I have a trouble in an OCL constraint that checks the blank characters
> in a string. I cannot write a constraint using the operations defined on
> OCL String. Following constraint is not working either. Could anyone
> help me?
>
>
> " not (self.name->includes(' ')) "
>
>
> ...

Re: OCL constraint [message #533935 is a reply to message #533921]

Mon, 17 May 2010 10:06

Eclipse User

Originally posted by: Alexander.Igdalov.gmail.com

Cool! That's what an expert advice is!

Christian W. Damus wrote:
> Hi, all,
>
> A less pleasant-looking alternative to Java is:
>
> (1..self.name.size())->collect(i |
> self.name.substring(i, i))->excludes(' ')
>
> which basically includes an expansion of the OCL 2.2 characters()
> operation.
>
> :-)
>
> Christian
>
>
> On 13/05/10 08:14 AM, esin wrote:
>> Hi there,
>>
>> I have a trouble in an OCL constraint that checks the blank characters
>> in a string. I cannot write a constraint using the operations defined on
>> OCL String. Following constraint is not working either. Could anyone
>> help me?
>>
>>
>> " not (self.name->includes(' ')) "
>>
>>
>> ...
>

Re: OCL constraint [message #533946 is a reply to message #533921]

Mon, 17 May 2010 10:27

Eclipse User

Hi all,

Thanks for your replies. With the helps of all you, i solved my problem. And here is the solution:

Sequence{1..self.name.size()}->collect(i |self.name.substring(i, i))->excludes(' ')

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