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// This system has many delegation methods so that information in one class can
// be obtained in a neighbouring class easily. The delegation is created using
// derived attributes, which generate get methods for use by other code.
class Airline {
code;
name;
1 -- * RegularFlight;
}
// A regular flight flies every day and has a flight number and other fixed data.
class RegularFlight {
Integer number;
Time depTime;
* outgoing -- 1 Airport origin;
* incoming-- 1 Airport destination;
fullNumber = {getAirline().getCode()+getNumber()}
}
// A specific flight actually has passengers
class SpecificFlight {
* -- 1 RegularFlight;
Date depDate;
// Four delegation attributes to save multiple methods in this
// class from having to traverse the association
flightNumber = {getRegularFlight().getFullNumber()}
Airport origin = {getRegularFlight().getOrigin()}
Airport destination = {getRegularFlight().getDestination()}
Time plannedDepTime = {getRegularFlight().getDepTime()}
}
// A passenger on a flight
class Booking {
lazy seat;
* -- 1 SpecificFlight;
* -- 1 Passenger;
// Second-level delegation - data comes from RegularFlight
flightNumber = {getSpecificFlight().getFlightNumber()}
Airport destination = {getSpecificFlight().getDestination()}
// Simple delegation
passengerName = {getPassenger().getName()}
Time plannedDepTime = {getSpecificFlight().getPlannedDepTime()}
//Simple method using the data gathered by delegation
public String toString() {
return getFlightNumber()+" "+getPlannedDepTime()+" "+
getDestination().getName()+" "+getPassengerName()+" "+getSeat();
}
}
class Passenger {
lazy Integer freqFlyerNumber;
name;
}
class Airport {
code;
name;
}
// Mixin with main program to test the above
class Airline {
public static void main(String [ ] args) {
Airport ott = new Airport("YOW","Ottawa");
Airport tor = new Airport("YYZ","Toronto Pearson");
Airline a = new Airline("AO","Air Ottawa");
RegularFlight r = a.addRegularFlight(100,java.sql.Time.valueOf("13:12:00"),ott,tor);
SpecificFlight f = r.addSpecificFlight(java.sql.Date.valueOf("2017-03-15"));
Passenger p = new Passenger("John");
Booking b = new Booking(f,p);
System.out.println(b);
}
}//$?[End_of_model]$?
class RegularFlight
{
position 203 52 142 94;
position.association Airport:destination__RegularFlight:incoming 104,94 0,30;
position.association Airport:origin__RegularFlight:outgoing 142,53 84,0;
}
class Airport
{
position 426 186 109 77;
}
class Booking
{
position 43 464 175 128;
position.association Booking__Passenger 183,79 0,15;
position.association Booking__SpecificFlight 30,0 27,131;
}
class Airline
{
position 26 30 109 77;
position.association Airline__RegularFlight 113,42 0,23;
}
class SpecificFlight
{
position.association RegularFlight__SpecificFlight 30,0 0,83;
position 50 229 172 128;
}
class Passenger
{
position 311 485 189 77;
}
// @@@skipcppcompile - Contains Java Code
// @@@skipphpcompile - Contains Java Code
// @@@skiprubycompile - Contains Java Code
// @@@skippythoncompile - Contains Java Code
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