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Containment reference ETL [message #1835045]

Mon, 23 November 2020 22:42

John Henbergs

Messages: 239
Registered: October 2020

Senior Member

Hi all,

I am writing a M2M transformation with ETL. This is my source model:
index.php/fa/39402/0/

And this is the transformation I wrote:


rule WorldMap2Worldmap
transform g: coronagraphical!WorldMap
to t: coronatextual!WorldMap
{
t.name = g.name;
}

// transformation rule for object country

rule Country2Country
transform g: coronagraphical!Country
to t: coronatextual!Country

{
t.name = g.name;
t.population = g.population;
t.zone = g.zone.getzone();
} 

//operation for enumeration zonelabel

operation Any getzone() {
if (self == coronagraphical!zonelabel#green) {
return coronatextual!zonelabelcolour#green;
}
else if (self = coronagraphical!zonelabel#red) {
return coronatextual!zonelabelcolour#red;
}
else {
return coronatextual!zonelabelcolour#yellow;
}
}

The target model that I get is this:
index.php/fa/39403/0/

So in the source model, countries are children of worldmap, while after the transformation they are siblings. How can I do it so they the countries will be children of worldmap after the transformation?

Thank you!

Attachment: Screenshot 2020-11-23 at 23.38.59.png
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Attachment: Screenshot 2020-11-23 at 23.40.50.png
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Re: Containment reference ETL [message #1835065 is a reply to message #1835045]

Tue, 24 November 2020 08:38

Dimitris Kolovos

Messages: 2163
Registered: July 2009
Location: York, UK

Senior Member

Hi,

[1] should help. Unfortunately, screenshots are not ideal for sharing models/metamodels (for example I can't tell if your World class in the target metamodel has a containment reference for countries). Going forward, you may want to consider sharing minimal running examples instead [2].

Thanks,
Dimitris

[1] https://www.eclipse.org/epsilon/doc/etl/#source-elements-resolution
[2] https://www.eclipse.org/epsilon/doc/articles/minimal-examples/

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Re: Containment reference ETL [message #1835071 is a reply to message #1835065]

Tue, 24 November 2020 10:12

John Henbergs

Messages: 239
Registered: October 2020

Senior Member

Hi Dimitris, thank you for your answer!

The WorldMap in the target metamodel, does have a containment reference for countries.

I will provide some more detailed screenshots in the following.
This is the source metamodel.

index.php/fa/39406/0/

And this is the target metamodel.

index.php/fa/39407/0/

As you can see, the containment reference is in both of them. I believe the issue is in how I write the transformations.

With the transformation that I uploaded in the previous message, in the target model countries are shown as siblings of the world map, and not children.