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How to test whether the active editor part is adaptable to something [message #758855]

Thu, 24 November 2011 13:19

Eclipse User

Hi,

is it possible to test whether the active editor part is adaptable to something using the core expressions? I need it in menu contribution's <visibleWhen> clause.

Re: How to test whether the active editor part is adaptable to something [message #758863 is a reply to message #758855]

Thu, 24 November 2011 14:52

Eclipse User

I think that the solution is to use a PropertyTester that asks the AdapterManager for the adapter.
See http://wiki.eclipse.org/FAQ_How_do_I_use_IAdaptable_and_IAdapterFactory%3F.

Re: How to test whether the active editor part is adaptable to something [message #758867 is a reply to message #758855]

Thu, 24 November 2011 15:32

Eclipse User

You can use the adapt element with instanceof directly in the core expression. See the Extension Point Description for the full list of elements.

PW

Re: How to test whether the active editor part is adaptable to something [message #758917 is a reply to message #758867]

Fri, 25 November 2011 04:19

Eclipse User

I have read the Extension Point Description but still I'm not able to achieve this. What is the exact use of those two elements? I have tried:

<visibleWhen checkEnabled="false">
   <with variable="activeEditor">
       <adapt type="cz.example.MyObjectINeedAdaptTo">
           <instanceof value="cz.example.MyObjectINeedAdaptTo">
           </instanceof>
       </adapt>
   </with>
</visibleWhen>

But it doesn't work.

I my editorpart I have

@Override
public Object getAdapter(Class adapter) {
    if (adapter == MyObjectINeedAdaptTo.class) {
        return new MyObjectINeedAdaptTo();
    }
    return super.getAdapter(adapter);
}

But the code inside if statement isn't called at all.

[Updated on: Fri, 25 November 2011 04:51] by Moderator

Re: How to test whether the active editor part is adaptable to something [message #758921 is a reply to message #758917]

Fri, 25 November 2011 05:06

Eclipse User

I got it. It isn't even necessary to use instanceof expression. The final visibleWhen element I was looking for is

<visibleWhen checkEnabled="false">
   <with variable="activeEditor">
       <adapt type="cz.example.MyObjectINeedAdaptTo">
       </adapt>
   </with>
</visibleWhen>

The reason why it wasn't working before is that evaluating obviously doesn't call getAdapter(Class adapter) on IAdaptable objects.
You must register your own IAdapterFactory and then provide an adapter to whatever you want. Why is that, I have no idea.

Re: How to test whether the active editor part is adaptable to something [message #759041 is a reply to message #758921]

Fri, 25 November 2011 13:58

Eclipse User

Behnil wrote on Fri, 25 November 2011 05:06

The reason why it wasn't working before is that evaluating obviously doesn't call getAdapter(Class adapter) on IAdaptable objects.
You must register your own IAdapterFactory and then provide an adapter to whatever you want. Why is that, I have no idea.

The core.expression code can't call getAdapter(Class) as it can't load the class, in your example, cz.example.MyObjectINeedAdaptTo. If IAdaptable had been written to take a String (like IAdapterManager) then it could have worked.

PW

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