Eclipse Community Forums: GMT (Generative Modeling Technologies)

Help

Home

Home » Archived » GMT (Generative Modeling Technologies) » EVL 'one' operator

Show: Today's Messages :: Show Polls :: Message Navigator

EVL 'one' operator [message #381762]

Sat, 29 March 2008 19:49

Andrew Lawson

Messages: 12
Registered: July 2009

Junior Member

Does EVL have the 'one' operator to act on collections when you are
interested in a condition appearing only once?

Report message to a moderator

Re: [Epsilon] EVL 'one' operator [message #381763 is a reply to message #381762]

Sat, 29 March 2008 20:45

Dimitrios Kolovos

Messages: 1776
Registered: July 2009

Senior Member

Hi Andrew,

There is the 'exists' operation: e.g. Sequence{1,2,4}.exists(i|i=1)
returns true.

Please remember to prefix message subjects with [Epsilon] in the future :)

Cheers,
Dimitrios

Andrew Lawson wrote:
> Does EVL have the 'one' operator to act on collections when you are
> interested in a condition appearing only once?
>
>

Report message to a moderator

Re: [Epsilon] EVL 'one' operator [message #381764 is a reply to message #381763]

Sat, 29 March 2008 23:41

Andrew Lawson

Messages: 12
Registered: July 2009

Junior Member

Hi Dimitrios,

Is want to say that something exists, but only once? I want to test that
in a collection an attribute is set to true but only for one member of the
collection. In OCL you would replace 'exists' with 'one', is there anything
like this in EVL?

Cheers,
Andrew

"Dimitrios Kolovos" <dskolovos@gmail.com> wrote in message
news:fsm9ou$hkf$1@build.eclipse.org...
> Hi Andrew,
>
> There is the 'exists' operation: e.g. Sequence{1,2,4}.exists(i|i=1)
> returns true.
>
> Please remember to prefix message subjects with [Epsilon] in the future
> :)
>
> Cheers,
> Dimitrios
>
>
> Andrew Lawson wrote:
>> Does EVL have the 'one' operator to act on collections when you are
>> interested in a condition appearing only once?

Report message to a moderator

Re: [Epsilon] EVL 'one' operator [message #381765 is a reply to message #381764]

Sun, 30 March 2008 00:43

Dimitrios Kolovos

Messages: 1776
Registered: July 2009

Senior Member

Hi Andrew,

I see. I'm afraid there is no such operation currently in EOL. Could you
please open an enhancement feature in the bugzilla? As a temporary
workaround you can use the select() operation and check the size of the
returned result: e.g. Sequence{1,2,3}.select(i|i=1).size() = 1

Cheers,
Dimitrios

Andrew Lawson wrote:
> Hi Dimitrios,
>
> Is want to say that something exists, but only once? I want to test that
> in a collection an attribute is set to true but only for one member of the
> collection. In OCL you would replace 'exists' with 'one', is there anything
> like this in EVL?
>
> Cheers,
> Andrew
>
>
> "Dimitrios Kolovos" <dskolovos@gmail.com> wrote in message
> news:fsm9ou$hkf$1@build.eclipse.org...
>> Hi Andrew,
>>
>> There is the 'exists' operation: e.g. Sequence{1,2,4}.exists(i|i=1)
>> returns true.
>>
>> Please remember to prefix message subjects with [Epsilon] in the future
>> :)
>>
>> Cheers,
>> Dimitrios
>>
>>
>> Andrew Lawson wrote:
>>> Does EVL have the 'one' operator to act on collections when you are
>>> interested in a condition appearing only once?
>
>

Report message to a moderator

Re: [Epsilon] EVL 'one' operator [message #381949 is a reply to message #381765]

Wed, 16 April 2008 09:13

Dimitrios Kolovos

Messages: 1776
Registered: July 2009

Senior Member

On a follow-up to this, the one() operation has been added in version
1.3.3 which was released yesterday.

Cheers,
Dimitrios

Dimitrios Kolovos wrote:
> Hi Andrew,
>
> I see. I'm afraid there is no such operation currently in EOL. Could you
> please open an enhancement feature in the bugzilla? As a temporary
> workaround you can use the select() operation and check the size of the
> returned result: e.g. Sequence{1,2,3}.select(i|i=1).size() = 1
>
> Cheers,
> Dimitrios
>
> Andrew Lawson wrote:
>> Hi Dimitrios,
>>
>> Is want to say that something exists, but only once? I want to test
>> that in a collection an attribute is set to true but only for one
>> member of the collection. In OCL you would replace 'exists' with
>> 'one', is there anything like this in EVL?
>>
>> Cheers,
>> Andrew
>>
>>
>> "Dimitrios Kolovos" <dskolovos@gmail.com> wrote in message
>> news:fsm9ou$hkf$1@build.eclipse.org...
>>> Hi Andrew,
>>>
>>> There is the 'exists' operation: e.g. Sequence{1,2,4}.exists(i|i=1)
>>> returns true.
>>>
>>> Please remember to prefix message subjects with [Epsilon] in the
>>> future :)
>>>
>>> Cheers,
>>> Dimitrios
>>>
>>>
>>> Andrew Lawson wrote:
>>>> Does EVL have the 'one' operator to act on collections when you are
>>>> interested in a condition appearing only once?
>>
>>

Report message to a moderator