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Re: [cdt-dev] Setting a default launch delegate in a product in the Default 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. 

Thanks,
Pawel


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 my
launch delegate ID

org.eclipse.debug.core/org.eclipse.debug.core.PREFERRED_DELEGATES/org.ec
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

https://bugs.eclipse.org/bugs/show_bug.cgi?id=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




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