大话设计模式读书笔记15----组合模式(Composite)

组合模式(Composite):将对象组合成树形结构以表示'部分-整体'的层次结构。组合模式使得用户对单个对象和组合对象的使用具有一致性。

using System;
using System.Collections.Generic;
using System.Text;

namespace Composite
{
    class Program
    {
        static void Main(string[] args)
        {
            ConcreteCompany root = new ConcreteCompany("北京总公司");
            root.Add(new HRDepartment("总公司人力资源部"));
            ConcreteCompany comp = new ConcreteCompany("上海华东分公司");
            comp.Add(new HRDepartment("上海华东分公司人力资源部"));
            root.Add(comp);
            Console.WriteLine("结构图：");
            root.Display(1);
            Console.WriteLine("职责：");
            root.LineOfDuty();
            Console.ReadLine();

        }
    }
    //定义抽象的公司类
    abstract class Company
    {
        private string _name;

        protected string Name
        {
            get { return _name; }
            set { _name = value; }
        }
        public Company(string name)
        {
            this._name = name;
        }
        public abstract void Add(Company c);
        public abstract void Remove(Company c);
        public abstract void Display(int depth);  //显示
        public abstract void LineOfDuty();
    }
    class ConcreteCompany : Company
    {
        private List<Company> children = new List<Company>();
        public ConcreteCompany(string name)
            : base(name)
        {
 
        }
        public override void Add(Company c)
        {
            children.Add(c);
        }
        public override void Remove(Company c)
        {
            children.Remove(c);
        }
        public override void Display(int depth)
        {
            Console.WriteLine(new string('-',depth)+Name);
            foreach (Company component in children)
            {
                component.Display(depth+2);
            }
        }
        public override void LineOfDuty()
        {
            foreach (Company component in children)
            {
                component.LineOfDuty();
            }
        }
    }
    class HRDepartment : Company
    {
        public HRDepartment(string name)
            : base(name)
        { }
        public override void Add(Company c)
        {
            throw new Exception("The method or operation is not implemented.");
        }
        public override void Remove(Company c)
        {
            throw new Exception("The method or operation is not implemented.");
        }
        public override void Display(int depth)
        {
            Console.WriteLine(new string('-', depth) + Name);
        }
        public override void LineOfDuty()
        {
            Console.WriteLine("{0}员工培训管理",Name);
        }
    }
}