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ISelectionProvider and Proxy Objects [message #656432]

Fri, 25 February 2011 15:55

Philipp Schill

Messages: 11
Registered: July 2010

Junior Member

Hi,
does anyone know a good solution for this problem:

Guess, I have a TreeViewer based ViewPart showing a number of objects. Due to performance reasons, we want to give a minimal number of information to the client (id and name). Only the ViewPart should work with these objects.

As soon as e.g. another view or wizard gets the selection from the tree (via ISelectionProvider), the tree should return a fully initialized object (not the lightweight object).

I tried to implement my own SelectionProvider but the problem is that getSelection() method is called from the owning ViewPart itself and I'm not able to distinguish that from an 'external' getSelection() call.

Does anyone know a good concept to get this work within the Eclipse architecture?

Thanks in advance
Regards
philipp

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Re: ISelectionProvider and Proxy Objects [message #656459 is a reply to message #656432]

Fri, 25 February 2011 18:17

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

The API you're working with basically returns selected objects 1 to 1.

Sounds like you can do one of:

1) make your objects light-weight that can then initialize themselves
when selected (becoming the full object)

2) deliberately offer reference objects, so consumers now to go
ref.getDelegate().

3) if you can deal in interfaces, use java.lang.reflect.Proxy where you
can switch out the reference for the real object and the client can't
tell the difference.

PW

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Paul Webster
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Paul Webster
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