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View ID changed - how to migrate perspectives [message #725260]

Wed, 14 September 2011 11:37

Richard Koop

Messages: 15
Registered: July 2009

Junior Member

We have a number of perspectives in our RCP app. We want to release a new version of the app but a number of the viewIDs in the new version of the app have changed. So if we try to bring up the new app using an old workspace we get a number of 'Could not create view' errors. Is there a way to migrate the old viewIds to a new viewId so old user perspective will not break?

I was looking in the workbench.xml file and was thinking about a global search/replace mapping old viewId to new one. But this seems kind of ugly!

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Re: View ID changed - how to migrate perspectives [message #725639 is a reply to message #725260]

Thu, 15 September 2011 11:57

Richard Koop

Messages: 15
Registered: July 2009

Junior Member

What I ended up doing was filtering out the old perspectives at startup before the workbench bundle was started. Then the workbench doesn't know about these views/perspectives anymore. You have to start the bundle that clears the preferences at a lower start level than the workbench otherwise you can't clear out the workbench *_persp perspective preferences values.

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Re: View ID changed - how to migrate perspectives [message #725813 is a reply to message #725639]

Thu, 15 September 2011 20:42

Marco Lopes

Messages: 61
Registered: September 2010

Member

This sounds interesting. Could you post the code? Thanks.

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Re: View ID changed - how to migrate perspectives [message #725845 is a reply to message #725813]

Fri, 16 September 2011 00:00

Richard Koop

Messages: 15
Registered: July 2009

Junior Member

Essentially you have to get a handle on the org.eclipse.ui.workbench prefs and clear out the properties where the key is 'perspective' (the current workbench perspective) and '*_persp' (the custom and changed perspectives). Once I've removed them I set a 'workbenchMigrated' preference to ensure I only do this once. From memory (not at work now) I think it's something like..

prefs = new InstanceScope("org.eclipse.ui.workbench");
if (prefs.getBoolean("workbenchMigrated", false))
return;
for (String key: prefs.keys()) {
if (key IS A PREF KEY)
prefs.remove(key);
}
prefs.setBoolean("workbenchMigrated", true);

This must be done before the workbench starts or the .remove will not work because the workbench locks them up good or something.

I still have to figure out how to 'clear' the workbench.xml file before startup otherwise I'll still get the 'Could not find view..' errors because the IDs have changed.

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