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Combining EMF switch classes [message #653832]

Fri, 11 February 2011 13:27

Nirmal Sasidharan

Messages: 120
Registered: July 2009
Location: Germany

Senior Member

Hello,

I am currently extending the EMF generated switch classes to traverse my model. Since I have many model packages, I also have multiple switch classes. I have now a requirement to combine multiple switch classes.That is, I want to use "casexxx" from different switch classes. Since java doesn't support multiple inheritance, I cannot extend multiple switch classes into one. I was thinking of a EMFSwitchDelegator class which adds multiple switch classes to a list and recursively calls doSwitch() on them till a non-null is returned. This is not possible as switch classes do not implement an interface (I have to go the ugly way of calling "doSwitch()" using Java reflection).

Do you have a better idea on how to do this? Is there any particular reason why switch classes don't implement an interface?

Thanks in advance.

Regards,
Nirmal

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Re: Combining EMF switch classes [message #653846 is a reply to message #653832]

Fri, 11 February 2011 13:56

Sylvain EVEILLARD

Messages: 556
Registered: July 2009

Senior Member

Have a look here

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Re: Combining EMF switch classes [message #653955 is a reply to message #653832]

Sat, 12 February 2011 02:21

Ed Merks

Messages: 30559
Registered: July 2009

Senior Member

Nirmal,

I just committed the changes for
https://bugs.eclipse.org/bugs/show_bug.cgi?id=287249 which sounds like
exactly what you need.

Nirmal Sasidharan wrote:
> Hello,
>
> I am currently extending the EMF generated switch classes to traverse
> my model. Since I have many model packages, I also have multiple
> switch classes. I have now a requirement to combine multiple switch
> classes.That is, I want to use "casexxx" from different switch
> classes. Since java doesn't support multiple inheritance, I cannot
> extend multiple switch classes into one. I was thinking of a
> EMFSwitchDelegator class which adds multiple switch classes to a list
> and recursively calls doSwitch() on them till a non-null is returned.
> This is not possible as switch classes do not implement an interface
> (I have to go the ugly way of calling "doSwitch()" using Java
> reflection).
>
> Do you have a better idea on how to do this? Is there any particular
> reason why switch classes don't implement an interface?
>
> Thanks in advance.
>
> Regards,
> Nirmal

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