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WIP creational patterns
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Claudiu Farcas
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using System;
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using System.Threading.Tasks;
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namespace design_patterns.creational.facadebuilder
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{
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/// <summary>
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/// this sample covers the case when we have multiple builders
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/// for the same class, that we want to chain
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/// </summary>
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public class FacadeBuilderSample
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{
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public static async Task Run() {
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Console.WriteLine("Creational - Facade Builder");
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var product = new ProductBuilder()
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.Info
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.WithName("New Product")
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.WithDetails("product details")
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.Price
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.WithPrice(67.12m)
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.WithDiscountLevel1(4)
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.WithDiscountLevel2(12)
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.Build();
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Console.WriteLine("product: " + product.ToString());
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// sample with implicit operator casting
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Product product2 = new ProductBuilder()
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.Info
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.WithName("New Product 2")
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.WithDetails("product details 2")
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.Price
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.WithPrice(23.11m)
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.WithDiscountLevel1(5)
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.WithDiscountLevel2(10);
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Console.WriteLine("product: " + product2.ToString());
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}
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}
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public class Product {
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// first section handled by a builder
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public string Name { get; set; }
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public string Details { get; set; }
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// second section handled by another builder
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public decimal Price { get; set; }
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public int DiscountPercentLevel1 { get; set; }
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public int DiscountPercentLevel2 { get; set; }
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public override string ToString()
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{
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return $"{Name} : {Details} : {Price} : {DiscountPercentLevel1} : {DiscountPercentLevel2}";
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}
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}
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// this acts as a facade
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public class ProductBuilder
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{
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protected Product instance = new Product();
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public ProductInfoBuilder Info => new ProductInfoBuilder(instance);
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public ProductPriceBuilder Price => new ProductPriceBuilder(instance);
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public Product Build() {
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return instance;
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}
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public static implicit operator Product(ProductBuilder pb) => pb.instance;
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}
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public class ProductInfoBuilder : ProductBuilder {
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public ProductInfoBuilder(Product instance) {
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this.instance = instance;
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}
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public ProductInfoBuilder WithName(string name) {
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this.instance.Name = name;
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return this;
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}
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public ProductInfoBuilder WithDetails(string details) {
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this.instance.Details = details;
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return this;
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}
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}
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public class ProductPriceBuilder : ProductBuilder {
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public ProductPriceBuilder(Product instance) {
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this.instance = instance;
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}
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public ProductPriceBuilder WithPrice(decimal price) {
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this.instance.Price = price;
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return this;
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}
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public ProductPriceBuilder WithDiscountLevel1(int discount) {
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this.instance.DiscountPercentLevel1 = discount;
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return this;
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}
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public ProductPriceBuilder WithDiscountLevel2(int discount) {
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this.instance.DiscountPercentLevel2 = discount;
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return this;
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}
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}
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}
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@@ -0,0 +1,125 @@
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using System;
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using System.Threading.Tasks;
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namespace design_patterns.creational.fluentbuilder
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{
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/// <summary>
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/// Builder is a creational design pattern that
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/// lets you construct complex objects step by step.
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/// The pattern allows you to produce different types
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/// and representations of an object using the same construction code.
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///
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/// Fluent builder - limited as it cannot be extended via inheritance
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/// </summary>
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public class FluentBuilderSample
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{
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public static async Task Run() {
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Console.WriteLine("Creational - Fluent Builder");
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var product = ProductBuilder
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.CreateProduct()
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.WithName("New Product")
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.WithCategory("Best category")
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.WithAge(30)
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.WithPrice(45.22m)
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.Build();
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Console.WriteLine("product: " + product.ToString());
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}
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}
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public class Product {
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public int Age { get; set; }
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public decimal Price { get; set; }
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public string ProductName { get; set; }
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public string Category { get; set; }
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public string Info { get; internal set; }
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public override string ToString()
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{
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return $"{ProductName} : {Category} : {Age} : {Price}";
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}
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}
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public interface IProductBuilder :
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IProductName,
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IProductAge,
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IProductPrice,
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IProductCategory {
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Product Build();
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}
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public interface IProductName {
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IProductBuilder WithName(string productName);
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}
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public interface IProductAge {
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IProductBuilder WithAge(int productAge);
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}
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public interface IProductPrice {
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IProductBuilder WithPrice(decimal productPrice);
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}
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public interface IProductCategory {
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IProductBuilder WithCategory(string productCategory);
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}
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public class ProductBuilderWithInfo : ProductBuilder {
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IProductBuilder WithInfo(string info){
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this.instance.Info = info;
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return this;
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}
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}
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public abstract class ProductBuilderBase {
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}
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public class ProductBuilder :
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IProductBuilder
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{
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// set as protected to favor inheritance for extensibility of builder class
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protected Product instance;
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protected ProductBuilder() {}
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public static ProductBuilder CreateProduct()
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{
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var pb = new ProductBuilder() {
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instance = new Product()
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};
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return pb;
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}
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public Product Build()
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{
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return instance;
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}
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public IProductBuilder WithAge(int productAge)
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{
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this.instance.Age = productAge;
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return this;
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}
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public IProductBuilder WithCategory(string productCategory)
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{
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this.instance.Category = productCategory;
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return this;
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}
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public IProductBuilder WithName(string productName)
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{
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this.instance.ProductName = productName;
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return this;
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}
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public IProductBuilder WithPrice(decimal productPrice)
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{
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this.instance.Price = productPrice;
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return this;
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}
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}
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}
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@@ -0,0 +1,80 @@
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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namespace design_patterns.creational.functionalbuilder
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{
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/// <summary>
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/// Builder is a creational design pattern that
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/// lets you construct complex objects step by step.
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/// The pattern allows you to produce different types
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/// and representations of an object using the same construction code.
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///
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/// Functional builder - allow builder extension via extended methods
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/// </summary>
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public class FunctionalBuilderSample
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{
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public static async Task Run() {
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Console.WriteLine("Creational - Functional Builder");
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var product = new ProductBuilder()
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.WithName("New Product")
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.WithCategory("Best category")
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.WithAge(30)
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.WithPrice(45.22m)
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.Build();
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Console.WriteLine("product: " + product.ToString());
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}
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}
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public abstract class FunctionalBuilderBase<T, SELF>
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where SELF : FunctionalBuilderBase<T, SELF>
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where T : new()
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{
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private readonly List<Func<T, T>> actions = new List<Func<T, T>>();
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public SELF Apply(Action<T> action) {
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actions.Add(t => {
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action(t);
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return t;
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});
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return this as SELF;
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}
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public T Build() {
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return actions.Aggregate(new T(), (t, f) => f(t));
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}
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}
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public sealed class ProductBuilder : FunctionalBuilderBase<Product, ProductBuilder> {
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public ProductBuilder WithName(string name) =>
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Apply(p => p.ProductName = name);
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}
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/// <summary>
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/// allow extending the builder
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/// </summary>
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public static class ProductBuilderExtensions {
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public static ProductBuilder WithAge(this ProductBuilder builder, int age) =>
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builder.Apply(p => p.Age = age);
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public static ProductBuilder WithCategory(this ProductBuilder builder, string category) =>
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builder.Apply(p => p.Category = category);
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public static ProductBuilder WithPrice(this ProductBuilder builder, decimal price) =>
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builder.Apply(p => p.Price = price);
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}
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public class Product {
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public int Age { get; set; }
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public decimal Price { get; set; }
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public string ProductName { get; set; }
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public string Category { get; set; }
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public string Info { get; internal set; }
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public override string ToString()
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{
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return $"{ProductName} : {Category} : {Age} : {Price}";
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}
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}
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}
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