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@Check Validator with 2 or more parameters [message #1732734]

Thu, 19 May 2016 07:22

Eclipse User

Hi everyone,

I'm a totally newbie at XText and grammar definition.

I have a very simple grammar where I can define 'Element', 'Diagram', and 'Model'.

It need to be generic as a metamodel, but I want to do some validations (warnings and errors) to make more friendly. For example, I could define that a "Class belongs to SequenceDiagram from BPMN". It's totally wrong, but my grammar allows this crazyness.

I already use @Check to validate if an Element name begins with capital or not, but I failed to create a @Check that receive two or more parameters. It only works with one.

What I want is a @Check method that receive Element and Diagram (for example) so I could that if Element is a Class so Diagram need to be ClassDiagram. If not, then a error message is displayed. How can I use @Check with 2 or more parameters?

Best regards

Re: @Check Validator with 2 or more parameters [message #1732737 is a reply to message #1732734]

Thu, 19 May 2016 14:38

Eclipse User

Hi that is not possible

But you can define the check on one of the elements or the parent element and then navigate the as up and down
Inside the check method

Re: @Check Validator with 2 or more parameters [message #1732743 is a reply to message #1732737]

Thu, 19 May 2016 15:21

Eclipse User

Thanks, but how could I navigate up and down?

Re: @Check Validator with 2 or more parameters [message #1732744 is a reply to message #1732743]

Thu, 19 May 2016 15:30

Eclipse User

this depends on the grammar.

maybe your model has a list of (child) elements and diagrams or vice versa. there will be a getter for that Smile

using eContainer() you can move up to the parent.
the utility EcoreUtil2 have helpful methods for that as well

Re: @Check Validator with 2 or more parameters [message #1732749 is a reply to message #1732744]

Thu, 19 May 2016 16:47

Eclipse User

Thanks!!!!

I don't know if I wrote the best code but works!!!

@Check
def checkIfDiagramContainsRightElements(Diagram diagram) {
	if (diagram.kind.equals(DiagramKind.CLASSDIAGRAM)) {
		if (diagram.eContainer().eGet(ModelPackage.Literals.ELEMENT__KIND) == ElementKind.CLASS) {
			println("YES!!!")
		}
	}
}

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