Cast Set of some object type to Set of interface type which implement

Question

is possible in some elegant way cast Set of Foo objects cast into Set of IFoo?

I need call method like this:

public Set<Bar> doSomething(Set<IFoo>) { ... }

with Set like this:

private Set<Foo> foos;

where Foo has definition is this:

public class Foo implements IFoo { ... }

When I tried doSomething(Set<IFoo> foos) I got error Inconvertible type