Page 64 - DCAP308_OBJECT_ORIENTED_ANALYSIS_AND_DESIGN

Object Oriented Analysis and Design

Notes Although the structure of the model does not show it, the owner of the frequent flyer account
must be the same as the passenger. We directly associate TripReservation with
FrequentFlyerAccount and Customer, because a customer can make a reservation and specify a
frequent flyer account before a ticket is even issued. Multiple payments may be made for a trip,
such as two credit-card charges. Payment may also be made by cash or check.
Figure 5.8 describes the FlightOperations package. An airport serves many cities, and a city may
have multiple airports. Airlines operate flights between airports. A flight description refers to
the published description of air travel between two airports. In contrast, a flight refers to the
actual travel made by an airplane on a particular date. The frequency indicates the days of the
week for which the flight description applies. The start and stop effectivity dates bracket the
time period for which the published flight description is in effect. The actual origin, destination,
departure time, and duration of a flight can vary because of weather and equipment problems.
Figure 5.8: An Object Model for the FlightOperations Package

Source: http://www.pearsonhighered.com/assets/hip/us/hip_us_pearsonhighered/samplechapter/
0131238299.pdf
Figure 5.9 presents a simple model of the AircraftInformation package. Each aircraft model has
a manufacturer, model number, and specific numbering for seats. The seat type may be first
class, business, or coach. Each individual aircraft has a registration number and refers to an
aircraft model.
Figure 5.9: An Object Model for the AircraftInformation Package

Source: http://www.pearsonhighered.com/assets/hip/us/hip_us_pearsonhighered/samplechapter/
0131238299.pdf

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