Repositories Global only or contextual?

So say I'm implementing a repository for a Todo app. We'll call it Tasks,

class Tasks implements Set { ... }

assume that for this a repository is just the set interface, and tasks
are just strings

for (Task t : Tasks) {
    System.out.println( t );
}

should this code iterate all of the tasks in the system? or
should/could it simply iterate the tasks of the currently
authenticated user?

If it's all tasks how should one go about getting to just the users tasks?
-- 
Caleb Cushing

http://xenoterracide.com

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