Collection <Booking> getBookings(Date aDate)

Given: The Date object, 22/11/2013

1. Create a new empty collection, results.
2. Access the School object in schools, which in this case is {school3, school4}.
   For each School object accessed in step 2:
3. Access it's collection of Booking objects.
   For each Booking object accessed in step 3:
4. Check if it's dateRange Range object contains 22/11/2013
5. If it does, add the Booking object to results
6. Return results

If there are no bookings for the given date return an empty collection.

 private collection<Range> dates 

 public Boolean hasDate(Date aDate)

Post condition: returns true if the receiver's date Range object contains aDate, returns False otherwise

 private collection<Room, Booking> bookings 

 public collection<Booking> getBookings(Date aDate)

Post condition: returns a collection of all Booking objects linked to the receiver whose date attribute contains a Date object matching aDate.

Collection <Booking> getBookings(Date aDate)

Post condition: returns a collection of Booking objects which are linked to all the receivers linked School objects and whose date attribute contains a Date object matching aDate.

has from School to Booking
isIn from School to Room