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
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
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
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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