builder

Author: T0shik

README.md

@@ -5,3 +5,4 @@ Full Playlist can be found [here](https://www.youtube.com/playlist?list=PLOeFnOV
 
 ## Table of contents
 - [Factory, Abstract Factory, Factory Method](https://youtu.be/xN7EFHU_rXA)
+- [Builder](https://youtu.be/WfBsYo20D_I)

builder/builder.linq

@@ -0,0 +1,96 @@
+<Query Kind="Program">
+  <Namespace>System.Web</Namespace>
+</Query>
+
+void Main()
+{
+	//QueryBuilder builder = new QueryBuilder();
+	//FormBodyBuilder builder = new FormBodyBuilder();
+	//HttpHeaderBuilder builder = new HttpHeaderBuilder();
+	DictBuilder builder = new DictBuilder();
+	ConstructionProcess(builder);
+	builder.Build().Dump();
+}
+
+public void ConstructionProcess(IKeyValueCollectionBuilder builder)
+{
+	builder.Add("make", "lada")
+		.Add("colour", "red")
+		.Add("year", 1980.ToString());
+}
+
+public interface IKeyValueCollectionBuilder
+{
+	IKeyValueCollectionBuilder Add(string key, string value);
+}
+
+public class QueryBuilder : IKeyValueCollectionBuilder
+{
+	private StringBuilder _queryStringBuilder = new StringBuilder();
+	
+	public IKeyValueCollectionBuilder Add(string key, string value){
+		_queryStringBuilder.Append(_queryStringBuilder.Length == 0 ? "?" : "&");
+		_queryStringBuilder.Append(key);
+		_queryStringBuilder.Append('=');
+		_queryStringBuilder.Append(Uri.EscapeDataString(value));
+		return this;
+	}
+	
+	public string Build() {
+		return _queryStringBuilder.ToString();
+	}	
+}
+
+public class FormBodyBuilder : IKeyValueCollectionBuilder
+{
+	private StringBuilder _queryStringBuilder = new StringBuilder();
+
+	public IKeyValueCollectionBuilder Add(string key, string value)
+	{
+		_queryStringBuilder.Append(key);
+		_queryStringBuilder.Append('=');
+		_queryStringBuilder.Append(value);
+		_queryStringBuilder.AppendLine();
+		return this;
+	}
+
+	public string Build()
+	{
+		return _queryStringBuilder.ToString();
+	}
+}
+
+public class HttpHeaderBuilder : IKeyValueCollectionBuilder
+{
+	private StringBuilder _queryStringBuilder = new StringBuilder();
+
+	public IKeyValueCollectionBuilder Add(string key, string value)
+	{
+		_queryStringBuilder.Append(key);
+		_queryStringBuilder.Append(": ");
+		_queryStringBuilder.Append(value);
+		_queryStringBuilder.AppendLine();
+		return this;
+	}
+
+	public string Build()
+	{
+		return _queryStringBuilder.ToString();
+	}
+}
+
+public class DictBuilder : IKeyValueCollectionBuilder
+{
+	private Dictionary<string, string> Dictionary = new Dictionary<string, string>();
+
+	public IKeyValueCollectionBuilder Add(string key, string value)
+	{
+		Dictionary[key] = value;
+		return this;
+	}
+
+	public Dictionary<string, string> Build()
+	{
+		return Dictionary;
+	}
+}

builder/builder_better.linq

@@ -0,0 +1,57 @@
+<Query Kind="Program" />
+
+void Main()
+{
+	var builder = new CarBuilder();
+	BuildRedLada1980(builder);
+	builder.Build().Dump();
+}
+
+public void BuildRedLada1980(ICarBuilder builder)
+{
+	builder
+		.setMake("lada")
+		.setColour("red")
+		.setManifactureDate(DateTime.UtcNow);
+}
+
+public class Car
+{
+	public string Make { get; set; }
+	public string Colour { get; set; }
+	public string ManifactureDate { get; set; }
+}
+
+public interface ICarBuilder
+{
+	public ICarBuilder setMake(string make);
+
+	public ICarBuilder setColour(string colour);
+
+	public ICarBuilder setManifactureDate(DateTime date);
+}
+
+public class CarBuilder : ICarBuilder
+{
+	private Car _car = new Car();
+
+	public ICarBuilder setMake(string make)
+	{
+		_car.Make = make;
+		return this;
+	}
+
+	public ICarBuilder setColour(string colour)
+	{
+		_car.Colour = colour;
+		return this;
+	}
+
+	public ICarBuilder setManifactureDate(DateTime date)
+	{
+		_car.ManifactureDate = date.ToString("dd/MM/yyyy");
+		return this;
+	}
+	
+	public Car Build() => _car;
+}

builder/builder_wrong.linq

@@ -0,0 +1,43 @@
+<Query Kind="Program" />
+
+void Main()
+{
+	new CarBuilder()
+		.setMake("lada")
+		.setColour("red")
+		.setManifactureDate("01/01/1980")
+		.Build()
+		.Dump();
+}
+
+public class Car
+{
+	public string Make { get; set; }
+	public string Colour { get; set; }
+	public string ManifactureDate { get; set; }
+}
+
+public class CarBuilder
+{
+	private Car _car = new Car();
+
+	public CarBuilder setMake(string make)
+	{
+		_car.Make = make;
+		return this;
+	}
+
+	public CarBuilder setColour(string colour)
+	{
+		_car.Colour = colour;
+		return this;
+	}
+
+	public CarBuilder setManifactureDate(string date)
+	{
+		_car.ManifactureDate = date;
+		return this;
+	}
+	
+	public Car Build() => _car;
+}