RSCG- part 14 – DP_Decorator

 

 

name AutoInterface
nuget

https://www.nuget.org/packages/BeaKona.AutoInterfaceGenerator

link https://github.com/beakona/AutoInterface
author beakona

Implement the Design Pattern Decorator. Based on template – you can modify the source code generated
 

The code that you start with is

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public interface ICoffee                                                                                              
 
{
 
    public int Price { get; }
 
    public string Description { get; }
 
}
 
 
 
public class SimpleCoffee : ICoffee
 
{
 
    public SimpleCoffee()
 
    {
 
        Price = 3;
 
        Description = "Simple Coffee";
 
    }
 
    public int Price { get; set; }
 
    public string Description { get; set; }
 
 
 
public partial class MilkDecorator : ICoffee
 
{
 
    [BeaKona.AutoInterface(TemplateLanguage = "scriban", TemplateBody = SimpleCoffee.TemplateCoffeeDecorator)]
 
    private readonly ICoffee coffee;
 
 
 
    public int DecoratorPrice { get; set; } = 1;
 
    public MilkDecorator(ICoffee coffee)
 
    {
 
        this.coffee = coffee;
 
    }
 
 
 
 
 
 
 
}
 
 
 
public partial class ChocoDecorator : ICoffee
 
{
 
    [BeaKona.AutoInterface(TemplateLanguage = "scriban", TemplateBody = SimpleCoffee.TemplateCoffeeDecorator)]
 
    private readonly ICoffee coffee;
 
 
 
    public int DecoratorPrice { get; set; } = 2;
 
    public ChocoDecorator(ICoffee coffee)
 
    {
 
        this.coffee = coffee;
 
    }
 
 
 
 
 
}

The code that you will use is

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SimpleCoffee s = new SimpleCoffee();
 
Console.WriteLine(s.Description +" with Price "+ s.Price);
 
ICoffee withMilk = new MilkDecorator(s);
 
Console.WriteLine(withMilk.Description} +" with Price "+ withMilk.Price);
 
ICoffee withMilkAndChoco = new ChocoDecorator(withMilk);
 
Console.WriteLine(withMilkAndChoco.Description +" with Price "+ withMilkAndChoco.Price);

 

The code that is generated is

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partial class MilkDecorator                                                       
 
{
 
    int ICoffee.Price
 
    {
 
        get
 
        {
 
                return ((ICoffee)this.coffee).Price + DecoratorPrice;
 
        }
 
    }
 
 
 
    string ICoffee.Description
 
    {
 
        get
 
        {
                var name = this.GetType().Name.Replace("Decorator","");
 
                return ((ICoffee)this.coffee).Description + " with " + name;
 
        }
 
    }
 
}

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/DP_Decorator

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