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Transform multiple elements in one [message #1844053]

Mon, 30 August 2021 11:21

Tomas Wall

Messages: 53
Registered: April 2021

Member

Hi all,

I have the following scenario available in this link: https://www.eclipse.org/epsilon/live/?f32e2091

What I am trying to do is to transform the Area and Tree from the source model to a single Location in the target metamodel.

So if I have Forest(Forest1) -> Area(Area1) -> Tree(Tree1) in the source model, I want Forest(Forest1) -> Location (Area1 . Tree1) in the target metamodel.

Is there any way to do this and the reverse transformation of this one (meaning go from Forest(Forest1) -> Location (Area1 . Tree1) to orest(Forest1) -> Area(Area1) -> Tree(Tree1) ) with ETL?

Many thanks,
Tomas

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Re: Transform multiple elements in one [message #1844100 is a reply to message #1844053]

Wed, 01 September 2021 10:21

Dimitris Kolovos

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

Senior Member

Hi Tomas,

I'm afraid I can't see a Location type in the target metamodel.

Best,
Dimitris

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Re: Transform multiple elements in one [message #1844404 is a reply to message #1844100]

Mon, 13 September 2021 09:04

Tomas Wall

Messages: 53
Registered: April 2021

Member

Hi Dimitris,

Sorry for that. Here goes the right link: https://www.eclipse.org/epsilon/live/?8fe19286

The source metamodel is actually generated from Xtext, while the target metamodel is create in EMF.

Now in Xtext, the grammar is as follows:
________________________________________
Forest:
name=ID "{"
areas += Area;
"}"

Area:
name=ID "." trees+=Tree;

Tree:
name=ID;
________________________________________
And an instance model of this grammar is this:

Forest F1 {
area1.tree1;
}
_________________________________________

Now when I write the transformation I want area1.tree1 to be transformed into one single location, so the target model should be something like this:

ForestF1
---> Location area1.tree1

_______________________________________

However, I also want to be able to write the reverse transformation so that:

Location area1.tree1

can be transformed into

Area area1
---> Tree tree1
So a rule that would somehow check where the period is and would transform the element before the period in an area and the element after the period in a tree
Thank you in advance,
Tomas

[Updated on: Mon, 13 September 2021 11:08]

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Re: Transform multiple elements in one [message #1844492 is a reply to message #1844404]

Wed, 15 September 2021 08:11

Dimitris Kolovos

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

Senior Member

How should the transformation behave if there's a second tree under Area1?

Best,
Dimitris

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Re: Transform multiple elements in one [message #1844510 is a reply to message #1844492]

Wed, 15 September 2021 15:49

Tomas Wall

Messages: 53
Registered: April 2021

Member

Actually, it should only have one tree, so I changed the metamodel to reflect that.

You can find it in the following link: https://www.eclipse.org/epsilon/live/?e208ceb8

Thank you in advance!

Best,
Tomas

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Re: Transform multiple elements in one [message #1844521 is a reply to message #1844510]

Wed, 15 September 2021 20:41

Dimitris Kolovos

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

Senior Member

OK - the transformation in https://www.eclipse.org/epsilon/live/?fad971fa should do the trick.

Best,
Dimitris

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Re: Transform multiple elements in one [message #1844610 is a reply to message #1844521]

Fri, 17 September 2021 14:37

Tomas Wall

Messages: 53
Registered: April 2021

Member

Hi Dimitris,

Thank you for that. I am working on the reverse transformation and I was able to create the Area and Tree from the Location but I am having two issues:

1. I am trying to add an "if" condition using matches() method so that if the name of the location matches("\\.") then the part before the period should be transformed into an area and the part after the period will be transformed into a tree. However, the if condition is not working correctly. Is the matches() method not the correct one to use in this case or is there another issue?

2. Second issue is that the tree should be contained into an area not into a forest.

These are the transformations so far: https://www.eclipse.org/epsilon/live/?418ac620

Many thanks,
Tomas

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