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Getting to the "root" element by AQL query [message #1823331]

Wed, 25 March 2020 02:53

Eclipse User

Hi,

I wish to get to the root element in my model. I know I can apply ancestors()->last(), but this does not work on the root element itself (I want to keep the query generic, so that in case the selected element is the root element then it will also be selected).

Any advice?

Re: Getting to the "root" element by AQL query [message #1823335 is a reply to message #1823331]

Wed, 25 March 2020 04:39

Eclipse User

Hi

How about ancestors()->prepend(self)->last() or of course something involving an if test for isEmpty(), or a closure() of eContainer().

Regards

Ed Willink

Re: Getting to the "root" element by AQL query [message #1823336 is a reply to message #1823335]

Wed, 25 March 2020 04:53

Eclipse User

Thanks Ed!

I actually did something similar, but I thought there might be a simpler syntax.

I also tried using self.eResource().getContents(), which seemed to work, but when I used it for changing context it did not.

Regards,
Avi

Re: Getting to the "root" element by AQL query [message #1823344 is a reply to message #1823336]

Wed, 25 March 2020 06:25

Eclipse User

An EMF resource can have multiple root elements, so getContents() retruns a list, which would not work with "Change Context". If in your case you know there is a single root element you can getContents()->first()

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