Customer Appl Design Summary
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          Entity classes
          -----------------------------
          
          class Location {
             String city;
               initial value = "New York City"
               min length = 2 (if not null)
               max length = 40
               Rules:
                 the city may be null, but not empty
                 the city must not contain any XSS attacks (JavaScript tags)
             String country;
               initial value = "United States of America"
               min length = 1 (if not null)
               max length = 40
               Rules:
                 the country may be null, but not empty
                 the country must not contain any XSS attacks (JavaScript tags)          
           }   
           
           class CustomerEntity {
             int id;
               initial value = 1
               min = 1
               max = Integer.MAX
               Rules:
                 the id must be greater than zero           
           }
          
          class Customer extends CustomerEntity {
             String firstName;
               initial value = "John"
               min length = 1
               max length = 40
               Rules:
                 the firstName must not be null, or empty
                 the firstName must not contain any XSS attacks (JavaScript tags)              
             String lastName;
               initial value = "Smith"
               min length = 1
               max length = 40
               Rules:
                 the lastName must not be null, or empty
                 the lastName must not contain any XSS attacks (JavaScript tags)          
             Location location = <default location>
               Rules:
                 the location must not be null
             String phone; 
               initial value = null
               min length = 1 (if not null)
               max length = 20
               Rules:
                 the phone may be null, but not empty
                 the phone must not contain any XSS attacks (JavaScript tags)  
          }
          
          class Order extends CustomerEntity {
             Date orderDate;
               initial value = <current date>
               Rules:
                 the orderDate must be current date or earlier
             int customerId;
               initial value = 1
               min = 1
               max = Integer.MAX
               Rules:
                 the customerId must be greater than zero
             double totalAmount;
               initial value = 0.00
               min = 0.00
               max = Double.MAX
               Rules:
                 the totalAmount must be 0.00 or greater
                 the totalAmount is the sum of the subTotal for all the 
                     itemsForThisOrder
             String orderNumber;
               initial value = null
               min length = 2
               max length = 10
               Rules:
                 the orderNumber may be null, but not empty
                 the orderNumber must not contain any XSS attacks (JavaScript tags)   
             List<OrderItem> itemsForThisOrder;
               initial value = <empty list>
          }
          
          class OrderItem extends CustomerEntity {
             int orderId;
               initial value = 1
               min = 1
               max = Integer.MAX
               Rules:
                 the orderId must be greater than zero
             int productId;
               initial value = 1
               min = 1
               max = Integer.MAX
               Rules:
                 the productId must be greater than zero
             double unitPrice = 1.00
               min = 1.00
               max = Double.MAX
               Rules:
                 the unitPrice must be 1.00 or greater
             int quantity;
               initial value = 1
               min = 1
               max = Integer.MAX
               Rules:
                 the quantity must be greater than zero  
             double subTotal = <unitPrice * quantity>
               min = 1.00
               max = Double.MAX
               Rules:
                 the subTotal must be greater than zero     
          }
           
          class Product extends CustomerEntity {   
             String name;
               initial value = "unknown"
               min length = 1
               max length = 50
               Rules:
                 the name must not be null, or empty
                 the name must not contain any XSS attacks (JavaScript tags)          
             int supplierId;
               initial value = 1
               min = 1
               max = Integer.MAX
               Rules:
                 the supplierId must be greater than zero
             double unitPrice = 0.01
               min = 0.01
               max = Double.MAX
               Rules:
                 the unitPrice must be 0.01 or greater
             String packaging;
               initial value = null
               min length = 2
               max length = 30
               Rules:
                 the packaging may be null, but not empty
                 the packaging must not contain any XSS attacks (JavaScript tags)          
             boolean discontinued;
               initial value = false
          }
          
          class Supplier extends CustomerEntity {
             String company;
               initial value = "unknown"
               min length = 1
               max length = 40
               Rules:
                 the company must not be null, or empty
                 the company must not contain any XSS attacks (JavaScript tags)          
             String contact;
               initial value = null
               min length = 1 (if not null)
               max length = 50
               Rules:
                 the contact may be null, but not empty
                 the contact must not contain any XSS attacks (JavaScript tags)          
             Location location = <default location>
               Rules:
                 the location must not be null
             String phone; 
               initial value = null
               min length = 1 (if not null)
               max length = 30
               Rules:
                 the phone may be null, but not empty
                 the phone must not contain any XSS attacks (JavaScript tags)  
             String fax; 
               initial value = null
               min length = 1 (if not null)
               max length = 30
               Rules:
                 the fax may be null, but not empty
                 the fax must not contain any XSS attacks (JavaScript tags)       
          }
          
          Action classes
          --------------------
          CustomerDAO
            List<Customer> findCustomersByName(String firstName, String lastName)
            List<Customer> findAllCustomers()
            Customer findCustomerById(int id)
            void addCustomer(Customer customer)
            void updateCustomer(Customer customer)
            void deleteCustomer(Customer customer)
            void deleteCustomer(int id)

          OrderDAO
            List<Order> findOrdersByCustomer(Customer customer)
            List<Order> findOrdersByOrderDate(Date orderDate)
            Order findOrderById(int id)
            List<Order> findOrdersByOrderNumber(String orderNumber)
            void addOrder(Order order)
            void updateOrder(Order order)
            void deleteOrder(Order order)
            void deleteOrder(int id)

          ProductDAO
            List<Product> findAllProducts()
            Product findProductById(int id)
            List<Product> findProductsBySupplier(Supplier supplier)
            void addProduct(Product product)
            void updateProduct(Product product)
            void deleteProduct(Product product)
            void deleteProduct(int id)

          SupplierDAO
            List<Supplier> findAllSuppliers()
            List<Supplier> findSuppliersByCompanyName(String companyName)
            Supplier findSupplierById(int id)
            void addSupplier(Supplier supplier)
            void updateSupplier(Supplier supplier)
            void deleteSupplier(Supplier supplier)
            void deleteSupplier(int id)