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  • compositetheorynswithShare.cs

      using System;
      using System.Collections.Generic;
      using System.IO;
      using PrototypePattern;

      namespace CompositePattern {
     
        // The Interface                                                                                                                 
        public interface IComponent <T> {
          void Add(IComponent <T> c);
          IComponent <T> Remove(T s);
          string Display(int depth);
          IComponent <T> Find(T s);
          IComponent <T> Share (T s,IComponent <T> home);
          string Name {get; set;}
        }

        // The Composite
        [Serializable()]
        public class Composite <T> : IPrototype <IComponent <T>>, IComponent  <T> {
          List  <IComponent <T>> list;

          public string Name {get; set;}
        
          public Composite (string name)  {
            Name = name;
            list = new List <IComponent <T>> ();
          }

          public void Add(IComponent  <T> c) {
            list.Add(c);
          }

          // Finds the item from a particular point in the structure
          // and returns the composite from which it was removed
          // If not found, return the point as given
          public IComponent <T> Remove(T s) {
            holder = this;
            IComponent <T> p = holder.Find(s);
            if (holder!=null) {
              (holder as Composite<T>).list.Remove(p);
              return holder;
            } else
               return this;
          }
        
          IComponent <T> holder=null;
        
          // Recursively looks for an item
          // Returns its reference or else null
          public IComponent <T>  Find (T s) {
            holder = this;
            if (Name.Equals(s)) return this;
            IComponent <T> found=null;
            foreach (IComponent <T> c in list)  {
              found = c.Find(s);
              if (found!=null)
                break;
            }
            return found;
          }
          
          public IComponent <T> Share (T set, IComponent <T> toHere) {
            IPrototype <IComponent <T>> prototype = this.Find(set) as IPrototype <IComponent <T>>;
            IComponent <T> copy = prototype.DeepCopy() as IComponent<T>;
            toHere.Add(copy);
            return toHere;
          }
            
          // Displays items in a format indicating their level in the composite structure
          public string Display(int depth) {
            String s = new String('-', depth) + "Set "+ Name +  " length :" + list.Count + "\n";
            foreach (IComponent <T> component in list) {
              s += component.Display(depth + 2);
            }
            return s;
          }
        }

        // The Component
        [Serializable()]
        public class Component <T> : IPrototype <IComponent<T>>, IComponent <T> {
          public string Name {get; set;}
          
          public Component (string name)  {
            Name = name;
          }

          public void Add(IComponent <T> c) {
            Console.WriteLine("Cannot add to an item");
          }

          public IComponent <T>  Remove(T s) {
            Console.WriteLine("Cannot remove directly");
            return this;
          }

          public string Display(int depth) {
            return new String('-', depth) + Name+"\n";
          }
        
          public IComponent <T>  Find (T s) {
            if (s.Equals(Name)) return this;
            else
              return null;
          }
          
          public IComponent <T> Share (T set, IComponent  <T>toHere) {
            IPrototype <IComponent <T>> prototype = this.Find(set) as IPrototype <IComponent <T>>;
            IComponent <T> copy = prototype.Clone() as IComponent<T>;
            toHere.Add(copy);
            return toHere;
          }
        }
      }
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  • 原文地址:https://www.cnblogs.com/shihao/p/2500412.html
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