[news.eclipse.platform.rcp] Re: Action set, Editor input

[krishna.kamath@xxxxxxxxx (Krishna Kamath)]

Hi Geri,

It was getting a lot messy in the previous mails and real confusing. So 
let me start of with a clean mail.

Q1:!MESSAGE Could not create action delegate for id: myPackage.myAction
!MESSAGE The Plug-in myPackage.myPlugin could not create an instance of 
class myPackage.myActionClass
java.lang.InstantiationException: myPackage.myAction

You seem to have done everything right. May be you can try creating it 
from extension points using action sets. It is not really necessary 
though, I feel.

The following link may be useful:

http://wiki.eclipse.org/index.php/FAQ_Why_do_I_get_a_'plug-in_was_unable_to_load_class'_error_when_I_activate_a_menu_or_toolbar_action%3F

Q2:You don't need actions/-sets in plugin.xml if you add them in 
ApplicationActionBarAdvisor, do you? Anyway, had a wrong file name at 
setImageDescriptor(Activator.getImageDescriptor("/icons/sign.gif")); in 
the action class' constructor.

Once again to the problem of having to define the actions in every editor, 
the best way I feel is write all the actions in one of the packages and 
use these action classes in the required editor. 

As for menu and toolbar not looking 'sexy' you can may be once again use 
the action classes in the ApplicationActionBarAdvisor. On opening each of 
the editors get an handle to the actions and enable and disable them as 
required. This would mean giving the action objects in 
ApplicationActionBarAdvisor proper access (public/protected).

For "The chosen operation is not currently available." message is 
concerned. This appears when the associated action class fails to get 
instantiated. I feel if you are able to resolve the previous problem this 
will be resolved.


Yes you don't need them in plugin.xml. But it is more clearer and less 
error prone if you do it this way. Personally it is just a way I prefer 
doing it. It gives a better feel :).

Q3:How do I get the contents of the currently active editor?

UIPlugin.getDefault().getWorkbench().getActiveWorkbenchWindow().getActivePage().getActiveEditor().getEditorInput();

Q4:
I would like to open a file. Process it somehow. Put the results of this 
process into a new editor. Optionally save the contents of this new editor 
to a new file. Thus, the contents if the original file do not change.

I hope the file you will be processing is from the open active editor. In 
that case you can get a link to the file using the code I gave you in Q3. 
> From there may be you can process the info as you require and create a new 
file putting the processed data into it. You can create this file on the 
file system as a temp or a permanent file as you require. Then you can 
open a new editor taking this new file as the input to the editor, showing 
the processed data in the new editor. 

I hope I have understood your problem right? 

Hope these things were of some use :)

Regards,
krishan