设计模式》组合模式

例子

透明组合

• 部门 -》公司，部门，部门小组，员工

    public abstract class AbsComponent
    {
        protected string Name { get; }

        protected NodeType NodeType { get; }

        protected AbsComponent(string name, NodeType nodeType)
        {
            Name = name;
            NodeType = nodeType;
        }

        public abstract void Add(AbsComponent productComponent);

        public abstract void Remove(AbsComponent productComponent);

        public abstract void Display(int depth);
    }


    public abstract class Composite : AbsComponent
    {
        protected List<AbsComponent> Components { get; }

        public Composite(string name, NodeType nodeType) : base(name, nodeType)
        {
            Components = new List<AbsComponent>();
        }

        public override void Add(AbsComponent productComponent)
        {
            Components.Add(productComponent);
        }

        public override void Remove(AbsComponent productComponent)
        {
            Components.Remove(productComponent);
        }

        public override void Display(int depth)
        {
            for (int i = 0; i < depth; i++)
            {
                Console.Write("----");
            }

            Console.WriteLine(Name);

            foreach (var component in Components)
            {
                component.Display(depth + 1);
            }
        }
    }

    public class DepartmentComposite : Composite
    {
        public DepartmentComposite(string name) : base(name, NodeType.Department)
        {
        }
    }

    public class GroupComposite : Composite
    {
        public GroupComposite(string name) : base(name, NodeType.Group)
        {
        }
    }


    public class RootComposite : Composite
    {
        public RootComposite(string name) : base(name, NodeType.Root)
        {
        }
    }

    public enum NodeType
    {
        Root = 0,
        Department = 1,
        Group = 2,
        Person = 3
    }
    public class Person : AbsComponent
    {
        public Person(string name) : base(name,NodeType.Person)
        {
        }

        public override void Add(AbsComponent productComponent)
        {
            throw new NotImplementedException();
        }

        public override void Remove(AbsComponent productComponent)
        {
            throw new NotImplementedException();
        }

        public override void Display(int depth)
        {
            for (int i = 0; i < depth; i++)
            {
                Console.Write("----");
            }

            Console.WriteLine(Name);
        }
    }


        static void Main(string[] args)
        {

            var root = new RootComposite("总公司");

            var developmentDepartment = new DepartmentComposite("开发部");
            var renshiDepartment = new DepartmentComposite("人事");
            var chanpingDepartment = new DepartmentComposite("产品");
            root.Add(developmentDepartment);
            root.Add(renshiDepartment);
            root.Add(chanpingDepartment);
            var aRenshiDepartment = new GroupComposite("人事一组");
            renshiDepartment.Add(aRenshiDepartment);
            
            developmentDepartment.Add(new Person("cxl"));
            developmentDepartment.Add(new Person("cxl2"));
            aRenshiDepartment.Add(new Person("牛逼"));
            

            root.Display(0);
        }