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में छूट रणनीति मैं एक ऐसे सिस्टम को लागू करने की कोशिश कर रहा हूं जो मेरे कार्ट/पूर्ण ऑर्डर पर लागू कई छूट को संभाल सके। मैंने छूट के भीतर छूट की प्रसंस्करण को समाहित करने के लिए एक रणनीति प्रकार पैटर्न लागू किया है।शॉपिंग कार्ट और ऑर्डर
मैं निम्नलिखित के साथ आया हूं: कंक्रीट छूट बनाने वाले उप-वर्गों के साथ एक अमूर्त छूट आधार वर्ग। ये तब ऑर्डर/कार्ट ऑब्जेक्ट पर लागू होते हैं और कार्ट/ऑर्डर में जोड़े जाने पर ऑर्डर/कार्ट की सामग्री को संसाधित करेंगे।
संलग्न कोड पर कुछ टिप्पणियां पसंद करेंगे। विभिन्न संरक्षित रचनाकारों और सदस्यों को निचले स्तर के लिए आवश्यक "वर्चुअल" चिह्नित किया गया है।
Chev
using System;
using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;
namespace CodeCollective.RaceFace.DiscountEngine
{
[TestFixture]
public class TestAll
{
#region Tests
[Test]
public void Can_Add_Items_To_Cart()
{
Cart cart = LoadCart();
// display the cart contents
foreach (LineItem lineItem in cart.LineItems)
{
Console.WriteLine("Product: {0}\t Price: {1:c}\t Quantity: {2} \t Subtotal: {4:c} \t Discount: {3:c} \t| Discounts Applied: {5}", lineItem.Product.Name, lineItem.Product.Price, lineItem.Quantity, lineItem.DiscountAmount, lineItem.Subtotal, lineItem.Discounts.Count);
}
}
[Test]
public void Can_Add_Items_To_An_Order()
{
// create the cart
Order order = new Order(new Member("Chev"));
// add items to the cart
GenericProduct hat = new GenericProduct("Cap", 110m);
order.AddLineItem(hat, 5);
EventItem race = new EventItem("Ticket", 90m);
order.AddLineItem(race, 1);
// add discounts
Discount percentageOff = new PercentageOffDiscount("10% off all items", 0.10m);
percentageOff.CanBeUsedInJuntionWithOtherDiscounts = false;
order.AddDiscount(percentageOff);
Discount spendXgetY = new SpendMoreThanXGetYDiscount("Spend more than R100 get 10% off", 100m, 0.1m);
spendXgetY.SupercedesOtherDiscounts = true;
order.AddDiscount(spendXgetY);
Discount buyXGetY = new BuyXGetYFree("Buy 4 hats get 2 hat free", new List<Product> { hat }, 4, 2);
buyXGetY.CanBeUsedInJuntionWithOtherDiscounts = false;
buyXGetY.SupercedesOtherDiscounts = true;
order.AddDiscount(buyXGetY);
// display the cart contents
foreach (LineItem lineItem in order.LineItems)
{
Console.WriteLine("Product: {0}\t Price: {1:c}\t Quantity: {2} \t Subtotal: {4:c} \t Discount: {3:c} \t| Discounts Applied: {5}", lineItem.Product.Name, lineItem.Product.Price, lineItem.Quantity, lineItem.DiscountAmount, lineItem.Subtotal, lineItem.Discounts.Count);
}
}
[Test]
public void Can_Process_A_Cart_Into_An_Order()
{
Cart cart = LoadCart();
Order order = ProcessCartToOrder(cart);
// display the cart contents
foreach (LineItem lineItem in order.LineItems)
{
Console.WriteLine("Product: {0}\t Price: {1:c}\t Quantity: {2} \t Subtotal: {4:c} \t Discount: {3:c} \t| Discounts Applied: {5}", lineItem.Product.Name, lineItem.Product.Price, lineItem.Quantity, lineItem.DiscountAmount, lineItem.Subtotal, lineItem.Discounts.Count);
}
}
private static Cart LoadCart()
{
// create the cart
Cart cart = new Cart(new Member("Chev"));
// add items to the cart
GenericProduct hat = new GenericProduct("Cap", 110m);
cart.AddLineItem(hat, 5);
EventItem race = new EventItem("Ticket", 90m);
cart.AddLineItem(race, 1);
// add discounts
Discount percentageOff = new PercentageOffDiscount("10% off all items", 0.10m);
percentageOff.CanBeUsedInJuntionWithOtherDiscounts = false;
cart.AddDiscount(percentageOff);
Discount spendXgetY = new SpendMoreThanXGetYDiscount("Spend more than R100 get 10% off", 100m, 0.1m);
spendXgetY.SupercedesOtherDiscounts = true;
cart.AddDiscount(spendXgetY);
Discount buyXGetY = new BuyXGetYFree("Buy 4 hats get 2 hat free", new List<Product> { hat }, 4, 2);
buyXGetY.CanBeUsedInJuntionWithOtherDiscounts = false;
buyXGetY.SupercedesOtherDiscounts = true;
cart.AddDiscount(buyXGetY);
return cart;
}
private static Order ProcessCartToOrder(Cart cart)
{
Order order = new Order(cart.Member);
foreach(LineItem lineItem in cart.LineItems)
{
order.AddLineItem(lineItem.Product, lineItem.Quantity);
foreach(Discount discount in lineItem.Discounts)
{
order.AddDiscount(discount);
}
}
return order;
}
#endregion
}
#region Discounts
[Serializable]
public abstract class Discount : EntityBase
{
protected internal Discount()
{
}
public Discount(string name)
{
Name = name;
}
public virtual bool CanBeUsedInJuntionWithOtherDiscounts { get; set; }
public virtual bool SupercedesOtherDiscounts { get; set; }
public abstract OrderBase ApplyDiscount();
public virtual OrderBase OrderBase { get; set; }
public virtual string Name { get; private set; }
}
[Serializable]
public class PercentageOffDiscount : Discount
{
protected internal PercentageOffDiscount()
{
}
public PercentageOffDiscount(string name, decimal discountPercentage)
: base(name)
{
DiscountPercentage = discountPercentage;
}
public override OrderBase ApplyDiscount()
{
// custom processing
foreach (LineItem lineItem in OrderBase.LineItems)
{
lineItem.DiscountAmount = lineItem.Product.Price * DiscountPercentage;
lineItem.AddDiscount(this);
}
return OrderBase;
}
public virtual decimal DiscountPercentage { get; set; }
}
[Serializable]
public class BuyXGetYFree : Discount
{
protected internal BuyXGetYFree()
{
}
public BuyXGetYFree(string name, IList<Product> applicableProducts, int x, int y)
: base(name)
{
ApplicableProducts = applicableProducts;
X = x;
Y = y;
}
public override OrderBase ApplyDiscount()
{
// custom processing
foreach (LineItem lineItem in OrderBase.LineItems)
{
if(ApplicableProducts.Contains(lineItem.Product) && lineItem.Quantity > X)
{
lineItem.DiscountAmount += ((lineItem.Quantity/X) * Y) * lineItem.Product.Price;
lineItem.AddDiscount(this);
}
}
return OrderBase;
}
public virtual IList<Product> ApplicableProducts { get; set; }
public virtual int X { get; set; }
public virtual int Y { get; set; }
}
[Serializable]
public class SpendMoreThanXGetYDiscount : Discount
{
protected internal SpendMoreThanXGetYDiscount()
{
}
public SpendMoreThanXGetYDiscount(string name, decimal threshold, decimal discountPercentage)
: base(name)
{
Threshold = threshold;
DiscountPercentage = discountPercentage;
}
public override OrderBase ApplyDiscount()
{
// if the total for the cart/order is more than x apply discount
if(OrderBase.GrossTotal > Threshold)
{
// custom processing
foreach (LineItem lineItem in OrderBase.LineItems)
{
lineItem.DiscountAmount += lineItem.Product.Price * DiscountPercentage;
lineItem.AddDiscount(this);
}
}
return OrderBase;
}
public virtual decimal Threshold { get; set; }
public virtual decimal DiscountPercentage { get; set; }
}
#endregion
#region Order
[Serializable]
public abstract class OrderBase : EntityBase
{
private IList<LineItem> _LineItems = new List<LineItem>();
private IList<Discount> _Discounts = new List<Discount>();
protected internal OrderBase() { }
protected OrderBase(Member member)
{
Member = member;
DateCreated = DateTime.Now;
}
public virtual Member Member { get; set; }
public LineItem AddLineItem(Product product, int quantity)
{
LineItem lineItem = new LineItem(this, product, quantity);
_LineItems.Add(lineItem);
return lineItem;
}
public void AddDiscount(Discount discount)
{
discount.OrderBase = this;
discount.ApplyDiscount();
_Discounts.Add(discount);
}
public virtual decimal GrossTotal
{
get
{
return LineItems
.Sum(x => x.Product.Price * x.Quantity);
}
}
public virtual DateTime DateCreated { get; private set; }
public IList<LineItem> LineItems
{
get
{
return _LineItems;
}
}
}
[Serializable]
public class Order : OrderBase
{
protected internal Order() { }
public Order(Member member)
: base(member)
{
}
}
#endregion
#region LineItems
[Serializable]
public class LineItem : EntityBase
{
private IList<Discount> _Discounts = new List<Discount>();
protected internal LineItem() { }
public LineItem(OrderBase order, Product product, int quantity)
{
Order = order;
Product = product;
Quantity = quantity;
}
public virtual void AddDiscount(Discount discount)
{
_Discounts.Add(discount);
}
public virtual OrderBase Order { get; private set; }
public virtual Product Product { get; private set; }
public virtual int Quantity { get; private set; }
public virtual decimal DiscountAmount { get; set; }
public virtual decimal Subtotal
{
get { return (Product.Price*Quantity) - DiscountAmount; }
}
public virtual IList<Discount> Discounts
{
get { return _Discounts.ToList().AsReadOnly(); }
}
}
#endregion
#region Member
[Serializable]
public class Member : EntityBase
{
protected internal Member() { }
public Member(string name)
{
Name = name;
}
public virtual string Name { get; set; }
}
#endregion
#region Cart
[Serializable]
public class Cart : OrderBase
{
protected internal Cart()
{
}
public Cart(Member member)
: base(member)
{
}
}
#endregion
#region Products
[Serializable]
public abstract class Product : EntityBase
{
protected internal Product()
{
}
public Product(string name, decimal price)
{
Name = name;
Price = price;
}
public virtual string Name { get; set; }
public virtual decimal Price { get; set; }
}
// generic product used in most situations for simple products
[Serializable]
public class GenericProduct : Product
{
protected internal GenericProduct()
{
}
public GenericProduct(String name, Decimal price) : base(name, price)
{
}
}
// custom product with additional properties and methods
[Serializable]
public class EventItem : Product
{
protected internal EventItem()
{
}
public EventItem(string name, decimal price) : base(name, price)
{
}
}
#endregion
#region EntityBase
[Serializable]
public abstract class EntityBase
{
private readonly Guid _id;
protected EntityBase() : this(GenerateGuidComb())
{
}
protected EntityBase(Guid id)
{
_id = id;
}
public virtual Guid Id
{
get { return _id; }
}
private static Guid GenerateGuidComb()
{
var destinationArray = Guid.NewGuid().ToByteArray();
var time = new DateTime(0x76c, 1, 1);
var now = DateTime.Now;
var span = new TimeSpan(now.Ticks - time.Ticks);
var timeOfDay = now.TimeOfDay;
var bytes = BitConverter.GetBytes(span.Days);
var array = BitConverter.GetBytes((long)(timeOfDay.TotalMilliseconds/3.333333));
Array.Reverse(bytes);
Array.Reverse(array);
Array.Copy(bytes, bytes.Length - 2, destinationArray, destinationArray.Length - 6, 2);
Array.Copy(array, array.Length - 4, destinationArray, destinationArray.Length - 4, 4);
return new Guid(destinationArray);
}
public virtual int Version { get; protected set; }
#region Equality Tests
public override bool Equals(object entity)
{
return entity != null
&& entity is EntityBase
&& this == (EntityBase)entity;
}
public static bool operator ==(EntityBase base1,
EntityBase base2)
{
// check for both null (cast to object or recursive loop)
if ((object)base1 == null && (object)base2 == null)
{
return true;
}
// check for either of them == to null
if ((object)base1 == null || (object)base2 == null)
{
return false;
}
if (base1.Id != base2.Id)
{
return false;
}
return true;
}
public static bool operator !=(EntityBase base1, EntityBase base2)
{
return (!(base1 == base2));
}
public override int GetHashCode()
{
{
return Id.GetHashCode();
}
}
#endregion
#endregion
}
}
शायद आप उस कोड के कुछ विशिष्ट टुकड़े फ़िल्टर कर सकते हैं जिन्हें आप इनपुट चाहते हैं? –
उत्तर के लिए धन्यवाद। ईमानदार होने के लिए कोड के साथ एक विशिष्ट समस्या के बजाय यह एक वास्तुकला प्रश्न है। – Chev
रणनीति पैटर्न मेरे लिए सही प्रतीत नहीं होता है, खासकर यदि आप कार्ट में कई छूट लागू कर सकते हैं। मेरे लिए आप कुछ प्रकार के नियम इंजन को लागू करने की तलाश में हैं। – David