Prefactoring

7.1. Where We Are

Let us look at the classes we have developed so far. Figure 7-1 gives the overall picture, and the listing in Example 7-1 gives the details.

Example 7-1. Class details for the system so far

class CDRelease CommonString title UPCCode upc_code CDCategory category Days base_rental_period( ) Dollars get_rental_fee( ) class CDDisc CDRelease cd_release PhysicalID physical_id Rental current_rental start_rental(Customer the_renter) end_rental( ) // class PhysicalID class CDCategory class Rental Customer renter Timestamp start_time Timestamp end_time Days base_rental_period Boolean is_overdue( ) class CDDiscCollection CDDisc find_by_physical_id(PhysicalID a_physical_id) CDDisc [] find_by_cd_release(CDRelease a_cd_release) // Standard collection operations: add(CDDisc a_cd_disc) remove (CDDisc a_cd_disc) class CustomerID class Customer CustomerID customer_id CommonString name class CustomerCollection Customer find_by_customer_id(CustomerID a_customer_id) // Standard collection operations add(Customer customer_to_add) remove(Customer a_customer_id) // Check to see no current rentals

We have two use cases that we are developing: Checkout_a_CDDisc and Checkin_a_CDDisc. Figure 7-2 gives an overall sequence diagram for the Checkout_a_CDDisc case.

Figure 7-1. Class diagram for the system so far

Figure 7-2. Checkout_a_CDDisc

Likewise, Figure 7-3 gives a sequence diagram ...