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

Thu, 07 May 2009 10:24

Eclipse User

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

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

Thu, 07 May 2009 10:44

Eclipse User

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

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

Thu, 07 May 2009 13:27

Eclipse User

<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

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

Thu, 07 May 2009 13:55

Eclipse User

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

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

Thu, 07 May 2009 14:06

Eclipse User

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

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