[C# 디자인패턴] 제9강 컴포지트 패턴

예제코드

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace CSharp_CompositePattern
{
    abstract class Component
    {
        protected string name;
 
        public Component(string name)
        {
            this.name = name;
        }
 
        public abstract void Add(Component c);
        public abstract void Remove(Component c);
        public abstract void Display(int depth);
    }
    
    class Composite : Component
    {
        private List<Component> _children = new List<Component>();
 
        public Composite(string name) : base(name)
        {
        }
 
        public override void Add(Component component)
        {
            _children.Add(component);
        }
 
        public override void Remove(Component component)
        {
            _children.Remove(component);
        }
 
        public override void Display(int depth)
        {
            Console.WriteLine(new String('-', depth) + name);
 
            foreach (Component component in _children)
            {
                component.Display(depth + 2);
            }
        }
    }
 
    class Leaf : Component
    {
        public Leaf(string name) : base(name)
        {
        }
 
        public override void Add(Component c)
        {
            Console.WriteLine("Cannot add to a leaf");
        }
 
        public override void Remove(Component c)
        {
            Console.WriteLine("Cannot remove from a leaf");
        }
 
        public override void Display(int depth)
        {
            Console.WriteLine(new String('-', depth) + name);
        }
    }
 
    class Program
    {
        static void Main(string[] args)
        {
            Composite root = new Composite("root");
            root.Add(new Leaf("Leaf A"));
            root.Add(new Leaf("Leaf B"));
 
            Composite comp = new Composite("Composite X");
            comp.Add(new Leaf("Leaf XA"));
            comp.Add(new Leaf("Leaf XB"));
 
            root.Add(comp);
            root.Add(new Leaf("Leaf C"));
 
            Leaf leaf = new Leaf("Leaf D");
            root.Add(leaf);
            root.Remove(leaf);
 
            root.Display(1);
 
            Console.ReadKey();
        }
    }
}