ex7_21.txt

j2ee core design patterns

Example 7.21 Business Object: CustomerBO.java

public class CustomerBO {
    // CustomerData is a Data Object
    private CustomerData customerData;

    // ContactInfoBO is a dependent Business Object
    private ContactInfoBO contactInfoBO;

    public CustomerBO(CustomerData customerData) {
        // validate CustomerData values
        . . .
        // copy customer data to this object
        this.customerData = customerData;
    }

    public ContactInfoBO getContactInfoBO () {
        // if ContactInfoBO is not created, get data from 
        // customer data and wrap it with the 
        // ContactInfoBO wrapper
        if (contactInfoBO == null)
            contactInfoBO = new ContactInfoBO(
            customerData.getContactInfoData());
        return contactInfoBO;
    }

    // business methods for CustomerBO
    . . . 
}