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Add Builder pattern
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‎CreationalPatterns/Builder/AmericanPizzaBuilder.cs‎

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namespace CreationalPatterns.Builder;
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public class AmericanPizzaBuilder : PizzaBuilder
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{
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public override void BuildDough()
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{
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Pizza.Dough = "pan baked";
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}
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public override void BuildSauce()
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{
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Pizza.Sauce = "hot spicy";
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}
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public override void BuildTopping(string topping = "")
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{
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Pizza.Topping = topping;
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}
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}

‎CreationalPatterns/Builder/ItalianPizzaBuilder.cs‎

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namespace CreationalPatterns.Builder;
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public class ItalianPizzaBuilder : PizzaBuilder
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{
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public override void BuildDough()
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{
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Pizza.Dough = "crispy thin";
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}
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public override void BuildSauce()
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{
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Pizza.Sauce = "mild";
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}
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public override void BuildTopping(string topping = "")
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{
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Pizza.Topping = topping;
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}
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}

‎CreationalPatterns/Builder/Pizza.cs‎

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namespace CreationalPatterns.Builder;
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public class Pizza
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{
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public string Dough { get; set; }
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public string Sauce { get; set; }
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public string Topping { get; set; }
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public override string ToString()
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{
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return $"{Dough}+{Sauce}+{Topping}";
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}
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}

‎CreationalPatterns/Builder/PizzaBuilder.cs‎

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namespace CreationalPatterns.Builder;
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public abstract class PizzaBuilder
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{
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protected readonly Pizza Pizza;
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public PizzaBuilder()
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{
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Pizza = new Pizza();
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}
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public abstract void BuildDough();
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public abstract void BuildSauce();
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public abstract void BuildTopping(string topping = "");
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public Pizza Build()
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{
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return Pizza;
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}
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}

‎CreationalPatterns/Builder/README.md‎

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2020
A class can delegate to different `Builder` objects to create different representations of a complex object.
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![Real world example](https://sourcemaking.com/files/v2/content/patterns/Builder_example1.svg)
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![Real world example](https://sourcemaking.com/files/v2/content/patterns/Builder_example1.png)
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*Source*: SourceMaking.com
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## Example
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**Definition**
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![PizzaBuilder](/Diagrams/Builder.png)
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**Usage**
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```cs
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// Create a concrete builder
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var americanPizzaBuilder = new AmericanPizzaBuilder();
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// Create a director
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var waiter = new Waiter(americanPizzaBuilder);
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// Create a pizza
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var pizza = waiter.CreatePizza("Spinach+Olives");
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```
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## Comparison with other patterns
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* Builders can produce products that do not belong to the same class hierarchy or interface. It is a key difference between the `Builder` and other creational patterns.

‎CreationalPatterns/Builder/TestBuilder.cs‎

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using System;
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namespace CreationalPatterns.Builder;
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public class TestBuilder
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{
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public static void run()
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{
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var americanPizzaBuilder = new AmericanPizzaBuilder();
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var waiter = new Waiter(americanPizzaBuilder);
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var pizza = waiter.CreatePizza("Spinach+Olives");
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Console.WriteLine("Created Pizza: "+ pizza);
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}
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}

‎CreationalPatterns/Builder/Waiter.cs‎

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namespace CreationalPatterns.Builder;
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// Director
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public class Waiter
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{
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private PizzaBuilder _pizzaBuilder;
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public Waiter(PizzaBuilder pizzaBuilder)
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{
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_pizzaBuilder = pizzaBuilder;
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}
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public Pizza CreatePizza(string topping)
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{
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_pizzaBuilder.BuildDough();
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_pizzaBuilder.BuildSauce();
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_pizzaBuilder.BuildTopping(topping);
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return _pizzaBuilder.Build();
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}
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}

‎CreationalPatterns/Program.cs‎

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{
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static void Main(string[] args)
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{
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Prototype.TestPrototype.Run();
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Builder.TestBuilder.run();
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}
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}
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}

‎CreationalPatterns/doc/Builder.cd‎

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<?xml version="1.0" encoding="utf-8"?>
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<ClassDiagram MajorVersion="1" MinorVersion="1">
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<Class Name="CreationalPatterns.Builder.AmericanPizzaBuilder">
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<Position X="9" Y="5.25" Width="1.5" />
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<TypeIdentifier>
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<HashCode>AAAAAAAAAgAAAAAAAAAQAAAAAIAAAAAAAAAAAAAAAAA=</HashCode>
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<FileName>Builder\AmericanPizzaBuilder.cs</FileName>
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</TypeIdentifier>
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</Class>
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<Class Name="CreationalPatterns.Builder.ItalianPizzaBuilder">
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<Position X="11.25" Y="5.25" Width="1.5" />
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<TypeIdentifier>
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<HashCode>AAAAAAAAAgAAAAAAAAAQAAAAAIAAAAAAAAAAAAAAAAA=</HashCode>
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<FileName>Builder\ItalianPizzaBuilder.cs</FileName>
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</TypeIdentifier>
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</Class>
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<Class Name="CreationalPatterns.Builder.Pizza">
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<Position X="6.25" Y="2.5" Width="1.5" />
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<TypeIdentifier>
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<HashCode>AAgAAEAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAQA=</HashCode>
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<FileName>Builder\Pizza.cs</FileName>
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</TypeIdentifier>
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</Class>
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<Class Name="CreationalPatterns.Builder.PizzaBuilder">
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<Position X="10.25" Y="1.75" Width="1.5" />
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<TypeIdentifier>
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<HashCode>AAAAAAAAAgAAAAAAAAAQAAAAAIAAgAEAAAAAAAAAAAA=</HashCode>
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<FileName>Builder\PizzaBuilder.cs</FileName>
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</TypeIdentifier>
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<ShowAsAssociation>
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<Field Name="Pizza" />
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</ShowAsAssociation>
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</Class>
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<Class Name="CreationalPatterns.Builder.Waiter">
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<Position X="14.25" Y="2.5" Width="1.5" />
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<TypeIdentifier>
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<HashCode>AAAAAAAAAAAAAAAAEEAAAAAAAAAAAAAAAAAAAAAAAAA=</HashCode>
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<FileName>Builder\Waiter.cs</FileName>
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</TypeIdentifier>
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<ShowAsAssociation>
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<Field Name="_pizzaBuilder" />
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</ShowAsAssociation>
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</Class>
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<Font Name="Segoe UI" Size="9" />
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</ClassDiagram>

‎Diagrams/Builder.png‎

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