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[xtend] How to write this transformation? [message #516438]

Tue, 23 February 2010 17:42

No real name

Messages: 62
Registered: July 2009

Member

Hi,

I have to models MODEL1 and MODEL2 with class hierarchies like this:
(Classes are in capital letters, references not)

/-------------------------------------\
| MODEL1: |
| ------- |
| FBTYPE1 |
| inputEvents: List<INPUTEVENT> |
| outputEvents: List<OUTPUTEVENT> |
|-------------------------------------|
| MODEL2: |
| ------- |
| FBTYPE2 |
| interfaceList: INTERFACELIST |
| |
| INTERFACELIST |
| eventInputs: EVENTINPUTS |
| eventOutputs: EVENTOUTPUTS |
| |
| EVENTINPUTS |
| event: List<EVENT> |
| |
| EVENTOUTPUTS |
| event: List<EVENT> |
\-------------------------------------/

I'd like to transform an FBTYPE1 into an FBTYPE2 so that the resulting
FBTYPE2 has one EVENT for every INPUTEVENT or OUTPUTEVENT in FBTYPE1.

I started like this:

/----------------------------------------------------------- ---------\
| create functionblocks::FBType this FBTypeToFBType(cakefeed::FBTYPE |
| fbtype): |
| this.setName(fbtype.name) -> |
| this.setInterfaceList(EventsAndVarsToInterfaceList(fBType)) |
| ; |
| |
| create functionblocks::InterfaceList this |
| EventsAndVarsToInterfaceList(cakefeed::FBType fbtype): |
| this.setEventInputs(InputEventsToEventInputs(fbtype)) -> |
| this.setEventOutputs(OutputEventsToEventOutputs(fbtype)) |
| ; |
| |
| create functionblocks::EventInputs this |
| InputEventsToEventInputs(cakefeed::FBType fbtype): |
| this.setEvent(IFInputEventListToEventList(fbtype)) |
| ; |
| |
| create functionblocks::EventOutputs this |
| OutputEventsToEventOutputs(cakefeed::FBType fbtype): |
| this.setEvent(IFOutputEventListToEventList(fbtype)) |
| ; |
\----------------------------------------------------------- ---------/

In this case, IFInputEventListToEventList would create a list
that contains one Event for every IFInputEvent. However, I do
not know how to implement this. My first try looked like this:

/----------------------------------------------------------- ---------\
| create List this IFInputEventListToEventList(cakefeed::FBType |
| fbtype): |
| this.addAll(fbtype.inputEvents.<...>) |
| ; |
\----------------------------------------------------------- ---------/

In <...> I have to somehow transform every IFInputEvent into an Event.
How could this be done?

Maybe there is even a way to get rid of the list transformation and
instead to write something like
'fbtype.inputEvents.forAll(<add the Event that results from transforming
the IFInputEvent to this.event>)'.

Does anyone have an idea?

Thanks in advance,
Matthias

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Re: [xtend] How to write this transformation? [message #516466 is a reply to message #516438]

Wed, 24 February 2010 06:42

Erhard Weinell

Messages: 39
Registered: January 2010
Location: Kassel, Germany

Member

Wouldn't this get the job done?

create INTERFACELIST FBType1ToInterfaceList(FBTYPE1 in):
eventInputs.addAll(in.inputEvents.FBType1ToEventInputs()) ->
...

create EVENTINPUTS FBType1ToEventInputs(FBType1 in):
event.addAll(in.inputEvents.InputEventToEvent();

create EVENT InputEventToEvent(INPUTEVENT in):
...

note, extensions can be called 'on' any type that fits their first
parameter. Plus, collections of these type are iterated implicitly.

Best regards,
Erhard Weinell

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Re: [xtend] How to write this transformation? [message #516731 is a reply to message #516466]

Wed, 24 February 2010 17:38

No real name

Messages: 62
Registered: July 2009

Member

Erhard Weinell wrote:
> note, extensions can be called 'on' any type that fits their first
> parameter. Plus, collections of these type are iterated implicitly.

Oh, I didn't know that. And yes, it works. Thank you very much :)

Regards,
Matthias

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