Is there an elegant way to make every method in a class start with a certain block of code?

I have a class where every method starts the same way:

class Foo {
  public void bar() {
    if (!fooIsEnabled) return;
    //...
  }
  public void baz() {
    if (!fooIsEnabled) return;
    //...
  }
  public void bat() {
    if (!fooIsEnabled) return;
    //...
  }
}

Is there a nice way to require (and hopefully not write each time) the fooIsEnabled part for every public method in the class?