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SOEN 331: Assignment 5
Adrienne Digo(40058646)
Flora Avakian(40158192)
Rose Rutherford-Stone(27062516)
Due: November 28, 2021
Problem 1.
”To be a supervisor, one must have been employed for at least 2 years.” (Assume that
we have some global variable Date that holds the current date.)
Solution.
context
Employee
inv
:
s e l f . supervisor
−
>
r e j e c t ( hiredate
<
Date
−
2
years )
Problem 2.
”No employee must work for a project different that any of those of his supervisor’s.”
Solution.
context
Employee
inv
:
s e l f . employee . supervisor
−
>
f o r A l l ( e : Employee
|
( e . project
=
s e l f . project ) = true )
Problem 3.
”A supervisor and all of their subordinates must work in the same department.”
Solution.
context
Employee
inv
:
s e l f . subordinates
−
>
f o r A l l ( e : Employee
|
e . worksFor =
s e l f . worksFor)=true )
Problem 4.
”All connections in a station must be handled by a rail company.”
Solution.
context
Station
inv
:
s e l f . RailCompany . connection
−
>
i n c l u d e s A l l
( s e l f . handles )
Problem 5.
”Any ticket issued for a passenger who is accompanied, is discounted.”
Solution.
context
Passenger
inv
:
s e l f . issued
−
by . Ticket
−
>
s e l f . is
−
accompanied
−
by = True
implies
s e l f . discounted
1
Problem 6.
Provide a contract for operation changeDepartureBy(time: Integer) that changes the
departure time. Sooner departures are not permitted, and the arrival time is expected to be automat-
icaly updated.
Solution.
context
Flight : : changeDepartureBy ( time :
Integer
)
pre
:
s e l f . depatureTime
>
1
post
:
s e l f . arrivalTime =
s e l f . arrivalTime@pre + time
Problem 7.
“Flights arriving at the airport are handled by an airline that is housed by the airport.”
Solution.
context
Airport
inv
:
s e l f . a r r i v i n g F l i g h t s
−
>
e x i s t s ( f
:
Flight
|
f . a i r l i n e
=
s e l f . a i r l i n e )
Problem 8.
“No multiple flights depart from an airport at the same time.”
Solution.
context
Airport
inv
:
s e l f . departingFlights
−
>
f o r A l l
( f1 ,
f2 :
Flight
|
f1
<>
f2
implies
f1 .
departureTime
<>
t2 . departureTime )
Problem 9.
“The number of passengers that have booked a flight cannot exceed the capacity of the
flight.”
Solution.
context
Flight
pre
:
s e l f . passengers
−
>
s i z e ()
<
s e l f . capacity
Problem 10.
“All tickets on connections scheduled by a rail company are tickets issued by that
company.”
“All tickets issued by a rail company correspond to connections handled by the company.”
Solution.
context
Ticket
inv
:
s e l f . schedule . getConnection
−
>
f o r A l l ( c
:
Connection
|
c . railcompany =
s e l f . railcompany )
2
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