Extract Method Object · Los Techies

在Illustrator中创建3D对象，选择'Object' > 'Create' > '3D Object' #生活技巧# #数码产品使用技巧# #设计软件使用技巧#

13 August, 2009. It was a Thursday.

Today’s refactoring comes from Martin Fowlers list of refactorings. You can find his original article here with a brief description.

This is a more infrequent refactoring that I see myself using but it comes in handy at times. When trying to apply an Extract Method refactoring, and multiple methods are needing to be introduced, it is sometimes gets ugly because of multiple local variables that are being used within a method. Because of this reason, it is better to introduce an Extract Method Object refactoring and to segregate the logic required to perform the task.

1: public class OrderLineItem

2: {

3: public decimal Price { get; private set; }

4: }

5: 

6: public class Order

7: {

8: private IList<OrderLineItem> OrderLineItems { get; set; }

9: private IList<decimal> Discounts { get; set; }

10: private decimal Tax { get; set; }

11: 

12: public decimal Calculate()

13: {

14: decimal subTotal = 0m;

15: 

16: // Total up line items

17: foreach (OrderLineItem lineItem in OrderLineItems)

18: {

19: subTotal += lineItem.Price;

20: }

21: 

22: // Subtract Discounts

23: foreach (decimal discount in Discounts)

24: subTotal -= discount;

25: 

26: // Calculate Tax

27: decimal tax = subTotal * Tax;

28: 

29: // Calculate GrandTotal

30: decimal grandTotal = subTotal + tax;

31: 

32: return grandTotal;

33: }

34: }

This entails passing a reference to the class that will be returning the computation to a new object that has the multiple methods via the constructor, or passing the individual parameters to the constructor of the method object. I will be showing the former here.

1: public class OrderLineItem

2: {

3: public decimal Price { get; private set;}

4: }

5: 

6: public class Order

7: {

8: public IEnumerable<OrderLineItem> OrderLineItems { get; private set;}

9: public IEnumerable<decimal> Discounts { get; private set; }

10: public decimal Tax { get; private set; }

11: 

12: public decimal Calculate()

13: {

14: return new OrderCalculator(this).Calculate();

15: }

16: }

17: 

18: public class OrderCalculator

19: {

20: private decimal SubTotal { get; set;}

21: private IEnumerable<OrderLineItem> OrderLineItems { get; set; }

22: private IEnumerable<decimal> Discounts { get; set; }

23: private decimal Tax { get; set; }

24: 

25: public OrderCalculator(Order order)

26: {

27: OrderLineItems = order.OrderLineItems;

28: Discounts = order.Discounts;

29: Tax = order.Tax;

30: }

31: 

32: public decimal Calculate()

33: {

34: CalculateSubTotal();

35: 

36: SubtractDiscounts();

37: 

38: CalculateTax();

39: 

40: return SubTotal;

41: }

42: 

43: private void CalculateSubTotal()

44: {

45: // Total up line items

46: foreach (OrderLineItem lineItem in OrderLineItems)

47: SubTotal += lineItem.Price;

48: }

49: 

50: private void SubtractDiscounts()

51: {

52: // Subtract Discounts

53: foreach (decimal discount in Discounts)

54: SubTotal -= discount;

55: }

56: 

57: private void CalculateTax()

58: {

59: // Calculate Tax

60: SubTotal += SubTotal * Tax;

61: }

62: }

This is part of the 31 Days of Refactoring series. For a full list of Refactorings please see the original introductory post.

网址：Extract Method Object · Los Techies https://klqsh.com/news/view/181866

相关内容

Mastering Azure Resource Graph: Query & Analyse Tags with KQL
qq.shareAppMessage(Object object)
Angie Cepeda: “Los poderes sólo son para los niños”
3 Best Shoe Stores in Los Angeles, CA
Foot Locker in Hollywood: Los Angeles, California
The 10 Best Wedding Venues in Los Angeles
LOS ANGELES Shoe & Sneaker Store
Antes y después de Angie Arizaga: Así fueron los inicios de la chica reality
Silverlight: Embed IronRuby within XAML Part 2
How can I install clang

随便看看