Builder Design Pattern like Java and Fluent Interface
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- Subject: Builder Design Pattern like Java and Fluent Interface
- From: Joao Von <joao_carlos.geo@...>
- Date: 2015年8月28日 18:38:38 +0000 (UTC)
Hello everyone!
This is a Builder Design Pattern like Java, based on Refactoring book from
Martin Fowler. Fluent interface behavior in Lua is easy.
Sincerely yours!
João Von
-----------------------
class = require '30log'
-- Builder Pattern
NutritionFacts = class ('NutritionFacts')
NutritionFacts.servingSize = nil
NutritionFacts.servings = nil
NutritionFacts.calories = nil
NutritionFacts.fat = nil
NutritionFacts.sodium = nil
NutritionFacts.carbohydrate = nil
function NutritionFacts.init (self, builder)
self.servingSize = builder.servingSize
self.servings = builder.servings;
self.calories = builder.calories
self.fat = builder.fat
self.sodium = builder.sodium
self.carbohydrate = builder.carbohydrate
return self
end
NutritionFactsBuilder = class('Builder')
-- Required parameters
NutritionFactsBuilder.servingSize = nil
NutritionFactsBuilder.servings = nil
-- Optional parameters - initialized to default values
NutritionFactsBuilder.calories = 0
NutritionFactsBuilder.fat = 0
NutritionFactsBuilder.carbohydrate = 0
NutritionFactsBuilder.sodium = 0
function NutritionFactsBuilder.init (self, servingSize, servings)
self.servingSize = servingSize
self.servings = servings
end
function NutritionFactsBuilder.calories(self, val)
self.calories = val; return self end
function NutritionFactsBuilder.fat(self, val)
self.fat = val; return self end
function NutritionFactsBuilder.carbohydrate(self, val)
self.carbohydrate = val; return self end
function NutritionFactsBuilder.sodium(self, val)
self.sodium = val; return self end
function NutritionFactsBuilder.build(self)
return NutritionFacts:new(self)
end
cocaCola = NutritionFactsBuilder:new(240,8):calories(100):sodium(35):carbohydrate(27):build()
print(cocaCola.calories)