How to detect if a class/method exists before it's called by CI?

[eluser]kilishan[/eluser]
I'm working on the next update for Ocular, and am wanting to make it automatically check for existing view files even when a controller doesn't exist. The problem is that I'm not sure how to do this...

My initial thought is to hook into pre_controller(). However, the router has already run, so it should be kicking up an error at that point. Is this correct?

Does anyone have any other suggestions?

Thanks!
Lonnie