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[Xtend] recursive extension call [message #514159]

Fri, 12 February 2010 16:28

moni

Messages: 4
Registered: February 2010

Junior Member

Hallo,

i created a recursive extension call. since i could not use let to define internal variables, i created it like this

create this createSubapplication(SystemSubcomponent aSysComp, List[ApplicationType] fTypes, List[SystemImpl] allSystemImpls):
	this.setName(aSysComp.name)->
	this.subApplications.addAll(aSysComp.systemSubcomponent.createSubapplication(fTypes,allSystemImpls))->
	this;

this extension created all elements in the hierarchy. unfortunately it did not put this hierarchy into every element were it was supposed to be. i expected that more than one element of the same layer should include the same hierarchy but i found the complete hierary only within the last one. Is there any possibility to get the hierarchy into all elements?

expected:

- element 1
-- childelement
--- childchildelement ...
- element 2
-- childelement
--- childchildelement ...
- element 3
-- childelement
--- childchildelement ...

created:

- element 1
- element 2
- element 3
-- childelement
--- childchildelement ...

thanks for any help!

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Re: [Xtend] recursive extension call [message #514452 is a reply to message #514159]

Mon, 15 February 2010 12:19

Erhard Weinell

Messages: 39
Registered: January 2010
Location: Kassel, Germany

Member

moni wrote:

> this extension created all elements in the hierarchy. unfortunately it
> did not put this hierarchy into every element were it was supposed to
> be. i expected that more than one element of the same layer should
> include the same hierarchy but i found the complete hierary only within
> the last one. Is there any possibility to get the hierarchy into all
> elements?

If you want the "childelement" to be contained in all these top-level
elements, than the only way to go is to create three objects and add
them accordingly. You experience intended behaviour of EMF: If you add
an EObject to a new container, it is removed from its previous container
first. Furthermore, Xtend's 'create' only creates one instance per
actual parameter tuple, so you should use a non-create extension but
create instances manually (using 'new').

Best regards,
Erhard Weinell

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