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 ...

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