shvets / design_patterns_in_ruby

# bridge.rb
 
# Decouples an abstraction from it's implementation so that the two can vary independently.
 
# 1. implementor
 
class Material 
  def make
  end
end
 
# 2. concrete implementors
 
class MyMaterial1 < Material 
  def make
    puts "make: my material 1"
  end
end
 
class MyMaterial2 < Material 
  def make
    puts "make: my material 2"
  end
end
 
# 3. abstraction
 
class Product 
  def taste
  end
end
 
# 4. refined abstraction
 
class MyProduct < Product 
  def initialize(material)  # injecting implementor
    @material = material
  end
 
  def taste
    @material.make
  end
 
end
 
# 5. test (bridge)
 
material1 = MyMaterial1.new
 
product1 = MyProduct.new(MyMaterial1.new)
product2 = MyProduct.new(MyMaterial2.new)
 
product1.taste
product2.taste