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Core expression, adapt to inner class [message #335871]

Thu, 07 May 2009 14:24

Felix Dorner

Messages: 676
Registered: July 2009

Senior Member

Hey,

I'm trying to use the <adapt> element in a core expression, where the
target type is an inner class. So that looks like:

<activeWhen>
<and>
<count
value="1">
</count>
<iterate>
<adapt type="com.example.Outer.Inner">
</adapt>
</iterate>
</and>
</activeWhen>

That doesn't work. I also tried type="com.example.Outer$Inner", doesn't
work either.

Using type="java.lang.Object" and then adapting programatically inside
the handler's execute method works fine for test selections, so I'm sure
I have some objects for which the handler should be active..

Hope that someone can help.
Felix

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Re: Core expression, adapt to inner class [message #335872 is a reply to message #335871]

Thu, 07 May 2009 14:44

Felix Dorner

Messages: 676
Registered: July 2009

Senior Member

Hm it must be some other problem. I extracted the inner class to be a
toplevel type and the handler remains inactive. I just read that the
expression returns not loaded if

"either the adapter* or the type referenced isn't loaded yet"

This is what probably happens in my case.

*) But I don't understand to which "adapter" the above phrase refers to.

Thanks for help,
Felix

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Re: Core expression, adapt to inner class [message #335877 is a reply to message #335871]

Thu, 07 May 2009 17:27

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

<adapt .../> does not use the IAdapter#getAdapter(*) interface. It only
uses org.eclipse.core.runtime.adapters and IAdapterManager#getAdapter(*)
Do you provide an adapter factory for the adapter manager?

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/ganymede/index.jsp?topic=/org.eclips e.platform.doc.isv/guide/workbench.htm

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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Re: Core expression, adapt to inner class [message #335883 is a reply to message #335877]

Thu, 07 May 2009 17:55

Felix Dorner

Messages: 676
Registered: July 2009

Senior Member

Paul Webster wrote:
> <adapt .../> does not use the IAdapter#getAdapter(*) interface. It only
> uses org.eclipse.core.runtime.adapters and IAdapterManager#getAdapter(*)
> Do you provide an adapter factory for the adapter manager?

No... *crying*. Thanks so much for telling me this :-)

Any reasons why the IAdapter interface itself isn't considered?

I might have been able to nail the problem down with a proper debug
entry point for the evaluation of such core expressions. Any Tip?

Thanks again,
Felix

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Re: Core expression, adapt to inner class [message #335885 is a reply to message #335883]

Thu, 07 May 2009 18:06

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

Felix Dorner wrote:
>
> Any reasons why the IAdapter interface itself isn't considered?

It has to do with class loading. o.e.core.expression is a pretty
low-level plugin, and so when you want a core expression to adapt to
"org.example.MyClass" o.e.core.expressions has no way of turning that
into a Class<?> object ... it can't see the class loader that can load
it by default. But that's just a technical problem.

There are potentially ways around it, but they either aren't reliable or
they would cause massive plugin loading on their first evaluations.

> I might have been able to nail the problem down with a proper debug
> entry point for the evaluation of such core expressions. Any Tip?

There is tracing available for core expressions, in the Tracing tab of
the launch config dialog. I'd try there first.

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/ganymede/index.jsp?topic=/org.eclips e.platform.doc.isv/guide/workbench.htm

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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