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Change value of ENum attribute depending on type of class [message #1850614]

Thu, 10 March 2022 08:46

John Henbergs

Messages: 239
Registered: October 2020

Senior Member

Hi,

In the source metamodel I have two classes; OnlineWorker and AwayWorker.
In the target metamodel I have an class "Worker" which has an attribute "status" with EType "Status", where Status is an Enum with two possible values: "Online" and "Away".

Now, when I transform the class OnlineWorker to Worker I want the value of the status (i.e., Enum) in the class Worker to be Online, and when I transform from AwayWorker to Worker I want the value of the status (i.e., Enum) in the class Worker to be Away.

However, I am not sure, how to change or select the right value that should be on the status attribute that has an Enum as Type, depending ono the type of class that is transformed.

Any suggestions would be appreciated!

Thank you!

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Re: Change value of ENum attribute depending on type of class [message #1850618 is a reply to message #1850614]

Thu, 10 March 2022 11:38

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Within a single mapping you may use oclIsKindOf as part of an if expression that selects the required enumeration literal.

Alternatively you may have distinct, ossibly disjuncted, OnlineWorker2Worker and AwayWorker2Worker that differ at least in regard to the enumeration literal.

Which approach you take may depend on the readability and more complex aspects of your problem.

Regards

Ed Willink

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Re: Change value of ENum attribute depending on type of class [message #1850623 is a reply to message #1850618]

Thu, 10 March 2022 13:33

John Henbergs

Messages: 239
Registered: October 2020

Senior Member

Hi Ed,

My idea was to proceed with the second approach that you suggested with two distinct mappings.

However, more specifically, my issue is on how to select a specific enumeration literal.

So if I was to have this mapping:

mapping OnlineWorker :: OnlineWorker2Worker : Worker {
result.status := // here I am not sure how to select the Online enumeration literal
}

Thank you in advance!

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Re: Change value of ENum attribute depending on type of class [message #1850628 is a reply to message #1850623]

Thu, 10 March 2022 19:36

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

The syntax for an enumeration literal is e.g. CollectionKind::SET

Regards

Ed Willink

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