TD_UML/trip_states.py at main · oussa92/TD_UML · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
from abc import ABC, abstractmethod
from enums import TripStatus
from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from driver import Driver
    from trip import Trip

class TripState(ABC):
    @abstractmethod
    def request(self, trip: 'Trip'):
        pass

    @abstractmethod
    def assign(self, trip: 'Trip', driver: 'Driver'):
        pass

    @abstractmethod
    def start(self, trip: 'Trip'):
        pass

    @abstractmethod
    def end(self, trip: 'Trip'):
        pass

class RequestedState(TripState):
    def request(self, trip: 'Trip'):
        print("Trip is already in requested state.")

    def assign(self, trip: 'Trip', driver: 'Driver'):
        trip.set_driver(driver)
        trip.set_status(TripStatus.ASSIGNED)
        trip.set_state(AssignedState())

    def start(self, trip: 'Trip'):
        print("Cannot start a trip that has not been assigned a driver.")

    def end(self, trip: 'Trip'):
        print("Cannot end a trip that has not been assigned a driver.")

class AssignedState(TripState):
    def request(self, trip: 'Trip'):
        print("Trip has already been requested and assigned.")

    def assign(self, trip: 'Trip', driver: 'Driver'):
        print("Trip is already assigned. To re-assign, cancel first.")

    def start(self, trip: 'Trip'):
        trip.set_status(TripStatus.IN_PROGRESS)
        trip.set_state(InProgressState())

    def end(self, trip: 'Trip'):
        print("Cannot end a trip that has not started.")


class InProgressState(TripState):
    def request(self, trip: 'Trip'):
        print("Trip is already in progress.")

    def assign(self, trip: 'Trip', driver: 'Driver'):
        print("Cannot assign a new driver while trip is in progress.")

    def start(self, trip: 'Trip'):
        print("Trip is already in progress.")

    def end(self, trip: 'Trip'):
        trip.set_status(TripStatus.COMPLETED)
        trip.set_state(CompletedState())


class CompletedState(TripState):
    def request(self, trip: 'Trip'):
        print("Cannot request a trip that is already completed.")

    def assign(self, trip: 'Trip', driver: 'Driver'):
        print("Cannot assign a driver to a completed trip.")

    def start(self, trip: 'Trip'):
        print("Cannot start a completed trip.")

    def end(self, trip: 'Trip'):
        print("Trip is already completed.")