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Assigning values to a Map owned by a target element [message #1860807]

Mon, 04 September 2023 08:14

Yves BERNARD

Messages: 146
Registered: July 2014

Senior Member

I'm trying to get a transformation that can create EAnnotation. For that purpose, I wrote the following called rule:

rule createEAnnotation(source: String, key: String, value: String) {
	
	to 
		tgt: ECORE!EAnnotation (
			source <- source
			,details <- Map{(key, value)}
		)
}

But at runtime, calling this rule generates the following exception:

org.eclipse.m2m.atl.emftvm.util.VMException: java.lang.IllegalArgumentException: Cannot assign Map{'derivation'='-- some OCL code'} to multi-valued field EAnnotation::details

However the eCore javadoc actually says that this attribute is typed by EMap<java.lang.String,java.lang.String>

What is wrong?

Yves

[Updated on: Mon, 04 September 2023 12:51]

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Re: Assigning values to a Map owned by a target element [message #1860817 is a reply to message #1860807]

Mon, 04 September 2023 15:33

Yves BERNARD

Messages: 146
Registered: July 2014

Senior Member

It looks like I already report this issue and that I got the solution... So, sorry for having asking this question again. I provide the solution here for the record, in case somebody would look for it as well.

This is the proper way to do it:

rule createEAnnotation(source: String, key: String, value: String) {
	to 
	tgt: ECORE!EAnnotation (
		source <- source	
		,details <- Set{entry}
	),
	
	entry: ECORE!EStringToStringMapEntry(
		key <- key
		,value <- value
	)

}

Yves

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Re: Assigning values to a Map owned by a target element [message #1860819 is a reply to message #1860817]

Mon, 04 September 2023 18:40

Dennis Wagelaar

Messages: 581
Registered: September 2012
Location: Belgium

Senior Member

That is indeed the solution, because:

public interface EMap<K, V> extends EList<Map.Entry<K, V>>

which means ATL treats EAnnotation::details as a Sequence.

Cheers,
Dennis

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Re: Assigning values to a Map owned by a target element [message #1861041 is a reply to message #1860819]

Fri, 15 September 2023 08:29

Yves BERNARD

Messages: 146
Registered: July 2014

Senior Member

Ok, so:

details <- Sequence{entry}

is even better.

Yves

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