Dp Bridge
DodaTech
1 min read
In this tutorial, you'll learn about How to Fix Bridge Errors. We cover key concepts, practical examples, and best practices.
Fix bridge errors when abstraction and implementation coupled via inheritance explosion.
Quick Fix
Wrong
class CircleV1:
def draw(self): print('Circle with V1')
class SquareV1:
def draw(self): print('Square with V1')
class CircleV2:
def draw(self): print('Circle with V2')
class SquareV2:
def draw(self): print('Square with V2')
2 shapes * 2 implementations = 4 classes. M * N explosion.
Right
class Renderer:
def render(self,shape): pass
class V1Renderer(Renderer):
def render(self,shape): print(f'{shape} with V1')
class V2Renderer(Renderer):
def render(self,shape): print(f'{shape} with V2')
class Shape:
def __init__(self,renderer): self.renderer=renderer
def draw(self): pass
class Circle(Shape):
def draw(self): self.renderer.render('Circle')
class Square(Shape):
def draw(self): self.renderer.render('Square')
Circle(V1Renderer()).draw() # 'Circle with V1'
M+N classes instead of M*N. Abstraction (Shape) separate from implementation (Renderer).
Prevention
Bridge decouples abstraction from implementation so they can vary independently.
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