Need to disable cash on delivery if there is a virtual product in cart

Hi, i have a requirement of disabling the Cash on delivery if there is any Virtual product in the cart. Two scenarios can lead to this:
a) User first adds a virtual product in cart and then adds a physical product in the cart : This works fine. Cash on delivery is not available.
b) User adds a BUNDLE product(YITH Plugin) which contains a virtual product as well as a physical product: Cash on delivery is still shown. Need to disable it