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Difficulty with an ATL expression [message #106539]

Sun, 14 June 2009 17:40

Eclipse User

Originally posted by: oba.informatik.uni-kiel.de

Hallo,

I have the following meta-model subset:

// A class "State" with a reference called "stateArgs"
// to another class "StateArgument":

<eClassifiers xsi:type="ecore:EClass" name="State">
<eStructuralFeatures xsi:type="ecore:EReference" name="cstate"
ordered="false"
eType="#//CState" containment="true"/>
<eStructuralFeatures xsi:type="ecore:EReference" name="stateArgs"
ordered="false"
upperBound="-1" eType="#//StateArgument" containment="true"/>
</eClassifiers>

// The model element "StateArgument" with an attribute "type" whichs
// datatpye is "Pseudo":

<eClassifiers xsi:type="ecore:EClass" name="StateArgument">

<eStructuralFeatures xsi:type="ecore:EAttribute" name="type"
ordered="false" unique="false"
eType="#//Pseudo"/>
</eClassifiers>

// "Pseudo" is an enumaration, where a literal 'final' is.

I simply want to select the "State"s which are of type final.
Namely I try to do something like that:

helper context MM1!State def: isFinal : Boolean =
let cllctn : Collection = collection -> select
(State|State.stateArgs.type = 'final')

if self.stateArgs.oclIsUndefined() then
false
else
for self.allInstancesFrom(MM1:StateArgument)
// This is the point where I don't know how to 'say' "which have the
type final".

I know, this must be quite easy to write down. Anyone any idea? Sorry
for the newbie question.

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Re: Difficulty with an ATL expression [message #106601 is a reply to message #106539]

Mon, 15 June 2009 15:38

Freddy Allilaire

Messages: 130
Registered: July 2009

Senior Member

This is a multi-part message in MIME format.
--------------050000030806070702010006
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 8bit

Hi,

I think you can rewrite your helper isFinal with something similar to this:

helper context MM1!State def: isFinal : Boolean =
if self.stateArgs.oclIsUndefined() then
false
else
self.stateArgs->exist(e | e.type = #final)
endif

Regards,
Freddy

myName a

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