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Concat collection [message #899617]

Wed, 01 August 2012 15:10

Matthias N

Messages: 66
Registered: June 2012

Member

Hi,
I have a class A which can have multiple references to class B

What I want to do is, to concatenate all referenced names.

When I use the following command

self.VVCase__vvSubject->asSequence().name

I get:

'name1'
'name2'
'name3'

But what I want to have sth like this:

'name1, name2, name3'

How can I achive this with OCL ?! I found an example with "->iterate()", however my OCL sais "cannot find operation iterate() for the type (OrderedSet(VVCase)).

thanks

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Re: Concat collection [message #899622 is a reply to message #899617]

Wed, 01 August 2012 15:31

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

I often use iterate for exactly this purpose. It works.

Without seeing your code there is no chance of telling why it doesn't
work for you.

Regards

Ed Willink

On 01/08/2012 16:10, Matthias N wrote:
> Hi,
> I have a class A which can have multiple references to class B
>
> What I want to do is, to concatenate all referenced names.
>
> When I use the following command
>
> self.VVCase__vvSubject->asSequence().name
>
> I get:
>
> 'name1'
> 'name2'
> 'name3'
>
>
> But what I want to have sth like this:
> 'name1, name2, name3'
>
>
> How can I achive this with OCL ?! I found an example with
> "->iterate()", however my OCL sais "cannot find operation iterate()
> for the type (OrderedSet(VVCase)).
>
>
> thanks

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Re: Concat collection [message #899678 is a reply to message #899617]

Wed, 01 August 2012 18:49

Matthias N

Messages: 66
Registered: June 2012

Member

I am using the GMF Framework with OCL. Should "iterate" work ?!

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Re: Concat collection [message #899711 is a reply to message #899678]

Thu, 02 August 2012 04:36

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

And what did my reply say?

Yes. You have to provide an example to get further help ...

Regards

Ed Willink

On 01/08/2012 19:49, Matthias N wrote:
> I am using the GMF Framework with OCL. Should "iterate" work ?!

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Re: Concat collection [message #899773 is a reply to message #899711]

Thu, 02 August 2012 10:03

Matthias N

Messages: 66
Registered: June 2012

Member

Okay, I modelled the following with Ecore

+--------+
| root   |
+--------+
    <>
    |
    | 
+--------+        dogs * +-------+
| Person | <>----------- |  Dog  |
+--------+               +-------+

I populated the model with 3 dogs.

I use the interactive OCL console, e.g. context Person: self.dogs->size() results to 3.

When I input

self.dogs->

, auto-completion gives me

includes
includesAll
including
indexOf
insertAt
intersection
isEmpty
isUnique

no iterate ;(

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Re: Concat collection [message #899788 is a reply to message #899617]

Thu, 02 August 2012 11:20

Matthias N

Messages: 66
Registered: June 2012

Member

finally I got it.
Don't know why the auto-completion is not showing iterate, however it works:

dogs->iterate(iterator: Dog; result : String = '' | result.concat(iterator.name))

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Re: Concat collection [message #899813 is a reply to message #899773]

Thu, 02 August 2012 12:37

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Which release are you using?

Completion assist was ropy in Indigo. It's much better in Juno. Works
for me in Juno.

[Not even JDT is perfect on Completion assist; it is only a guide of
likely candidates.]

Regards

Ed Willink

On 02/08/2012 11:03, Matthias N wrote:
> Okay, I modelled the following with Ecore
>
>
> +--------+
> | root |
> +--------+
> <>
> |
> | +--------+ dogs * +-------+
> | Person | <>----------- | Dog |
> +--------+ +-------+
>
> I populated the model with 3 dogs.
>
> I use the interactive OCL console, e.g. context Person:
> self.dogs->size() results to 3.
>
> When I input self.dogs->, auto-completion gives me
>
> includes
> includesAll
> including
> indexOf
> insertAt
> intersection
> isEmpty
> isUnique
>
> no iterate ;(

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