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RE: [cdt-dev] Setting a default launch delegate in a product in theDefault Launchers preference page

Hello Pawel,

Thanks for the quick answer, now the problem is much clearer.

I am puzzled by the preference being stored in the workspace when
selected manually, but ignored when set via default. Also, it seems that
exporting and re-importing the preferences in a blank workspace will not
restore the previous launch delegate settings.

The current approach seems reasonable - maybe there is no need to change
extension point definitions once the products are able to override the
CDI default using customization.

I'll work on this and post a patch if I find one.



-----Original Message-----
From: cdt-dev-bounces@xxxxxxxxxxx [mailto:cdt-dev-bounces@xxxxxxxxxxx]
On Behalf Of Pawel Piech
Sent: den 23 juli 2009 00:14
To: CDT General developers list.
Subject: Re: [cdt-dev] Setting a default launch delegate in a product in
theDefault Launchers preference page

Hi Mario,
You are correct the platform does not set the default, it is sort of 
selected at random and overriding the preference is the currently the 
only mechanism to set the default launcher.  I was planning to use the 
preference mechanism to set the default in CDT, but I discovered that 
CDT doesn't have a "product" in which I could set the preference 
override.   As a result, late in CDT 6 when we got a lot of negative 
feedback for not having the standard launcher be the default, I put in a

hack set the default in CMainTab.setDefault().

I'm not really that familiar with the default preferences handling, so 
without debugging it myself I can't tell if the reason below is why it's

not working.  To be honext, once I figured out that this option wasn't 
going to work for CDT, I stopped testing it.  If you do some experiments

and find an easy way to fix it, file a bug against Platform Debug with a

patch and I'll gladly apply it.  Keep in mind though that the changes 
will need to be backward compatible. 

Also, if you would like to contribute a new addition to the launchers 
extension point to specify a default more explicitly I would gladly look

at that for 3.6 as well.


Mario Pierro wrote:
> Hello,
> I am trying to set a default launch delegate for our debugger, so that
> users will not need to explicitly set one in preferences (Run/Debug >
> Launching > Default Launchers).
> In my plugin_customization.ini, I am adding an entry which refers to
> launch delegate ID
> lipse.cdt.launch.applicationLaunchType=<my own launch delegate ID
> here>,debug
> However, this specific default setting seems to be ignored when the
> preferences page is initialized in my product.
> The preference key is formed as described in the class
> org.eclipse.debug.internal.core.LaunchManager 
> so that it is org.eclipse.debug.core.PREFERRED_DELEGATES followed by a
> slash and the launch configuration type id.
> I have looked through bug 262826
> However, by debugging through
> org.eclipse.core.internal.preferences.DefaultPreferences
> I have noticed that in the applyDefaults() method, line 133:
> 	private void applyDefaults(String id, Properties defaultValues,
> Properties translations) {
> 		for (Enumeration e = defaultValues.keys();
> e.hasMoreElements();) {
> 			String fullKey = (String) e.nextElement();
> 			String value =
> defaultValues.getProperty(fullKey);
> 			if (value == null)
> 				continue;
> 			IPath childPath = new Path(fullKey);
> 	here>>>>	String key = childPath.lastSegment();
> 			childPath = childPath.removeLastSegments(1);
> 			.
> 			.
> 			.
> the key gets set to the id of the launch configuration type 
> org.eclipse.cdt.launch.applicationLaunchType
> while the childPath is
> org.eclipse.debug.core/org.eclipse.debug.core.PREFERRED_DELEGATES
> because of the call to lastSegment()
> Might this cause the key which is set afterwards in the code to be
> incorrect?
> If so, how does CDT default to the CDI debugger launch? There seems to
> be no preferred launch delegate selected by default.
> Am I missing something?
> Thanks for your help!
> /Mario
> _______________________________________________
> cdt-dev mailing list
> cdt-dev@xxxxxxxxxxx

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