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VMS Motors Logon Window

First, we will create an implementation for a logon window, called VMSLogon, for which we only need to develop code for the {parse-xml} method. All of the other methods and states will be controlled by the ancestor framework Logon window, in combination with the VMS-specific implementation of the AppParameters class. The code for the VMSLogon window is listed in Figure 4-2.

We have written the code that is executed for our specific implementation of the {parse-xml} method, and there are two reasons why this is done at the application level rather than at the framework level. First, we need to define which SAXHandler to use, although we could have done this by passing this definition as an argument to the Logon class