FilesExpand file tree

fix-tests

/

bridge.py

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

56 lines (41 loc) · 1.35 KB

fix-tests

/

bridge.py

Copy path

Top

File metadata and controls

• Code
• Blame

56 lines (41 loc) · 1.35 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

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

"""

*References:

http://en.wikibooks.org/wiki/Computer_Science_Design_Patterns/Bridge_Pattern#Python

*TL;DR

Decouples an abstraction from its implementation.

"""

# ConcreteImplementor 1/2

class DrawingAPI1:

def draw_circle(self, x: int, y: int, radius: float) -> None:

print(f"API1.circle at {x}:{y} radius {radius}")

# ConcreteImplementor 2/2

class DrawingAPI2:

def draw_circle(self, x: int, y: int, radius: float) -> None:

print(f"API2.circle at {x}:{y} radius {radius}")

# Refined Abstraction

class CircleShape:

def __init__(

self, x: int, y: int, radius: float, drawing_api: DrawingAPI2 | DrawingAPI1

) -> None:

self._x = x

self._y = y

self._radius: float = radius

self._drawing_api = drawing_api

# low-level i.e. Implementation specific

def draw(self) -> None:

self._drawing_api.draw_circle(self._x, self._y, self._radius)

# high-level i.e. Abstraction specific

def scale(self, pct: float) -> None:

self._radius *= pct

def main():

"""

>>> shapes = (CircleShape(1, 2, 3, DrawingAPI1()), CircleShape(5, 7, 11, DrawingAPI2()))

>>> for shape in shapes:

... shape.scale(2.5)

... shape.draw()

API1.circle at 1:2 radius 7.5

API2.circle at 5:7 radius 27.5

"""

if __name__ == "__main__":

import doctest

doctest.testmod()