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ATL to EMFTVM migration problems [message #1836257]

Sat, 26 December 2020 21:17

Burak Karaduman

Messages: 84
Registered: July 2018

Member

Dear All,

I wrote my code in ATL and I am trying to adapt it to EMFTVM. However, it generates lots of problems, I was able to solve some of them.

rule TaskToProcess {
from
pim: PIM!Task (

)
to
processthread: PSM!Process (
Name <- pim.Name,
hasSensor <- pim.sense,
)
}

In the first phase, the following problem was generated.

org.eclipse.m2m.atl.emftvm.util.VMException: java.lang.IllegalArgumentException: Cannot assign 6f89b64:PSM!Sensor to multi-valued field Process_Thread::hasSensor ...

Then, I tried to modify the line from ( hasSensor <- pim.sense ) to (hasSensor <- Sequence{pim.sense}). I solved many problems using Sequence{}. However, new problem was also generated.


org.eclipse.m2m.atl.emftvm.util.VMException: java.lang.IllegalArgumentException: Cannot add/remove OclUndefined to/from multi-valued field Process_Thread::hasSensor ...

Some elements do not have to be added to the model and Oclundefined is generated because of this. How can overcome this problem? Is there a better way to adapt ATL code to EMFTVM code?

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Re: ATL to EMFTVM migration problems [message #1836284 is a reply to message #1836257]

Mon, 28 December 2020 10:22

Dennis Wagelaar

Messages: 589
Registered: September 2012
Location: Belgium

Senior Member

You also need to cover the case of pim.sense being OclUndefined (null), which should assign an empty Sequence instead of Sequence{OclUndefined}.

I've added an example with an ATL library you can use to wrap single values in ATL Collections at https://github.com/dwagelaar/atl.examples/tree/main/ATLSingleToMultiProperty

Cheers,
Dennis

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