一个没有方法继承的Flyweight模式
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Flyweight
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string document = "AAZZBBZBAAZZBBZBAAZZBBZB";
char[] chars = document.ToCharArray();
int charsCount=0;
CharacterFactory factory = new CharacterFactory();
foreach (char c in chars)
{
charsCount++;
Character character = factory.GetCharacter(c);
Response.Write(character.Display(charsCount,"#0000FF"));
}
Response.Write("共"+charsCount+"字符");
}
}
}
class CharacterFactory
{
private Dictionary<char, Character> _characters =
new Dictionary<char, Character>();
public Character GetCharacter(char key)
{
// Uses "lazy initialization"
Character character = null;
if (_characters.ContainsKey(key))
{
character = _characters[key];
}
else
{
switch (key)
{
case 'A': character = new CharacterA(); break;
case 'B': character = new CharacterB(); break;
//...
case 'Z': character = new CharacterZ(); break;
}
_characters.Add(key, character);
}
return character;
}
}
/// <summary>
/// The 'Flyweight' abstract class
/// </summary>
abstract class Character
{
protected char symbol;
protected int width;
protected int height;
protected string color;
protected int descent;
protected int fontsize;
public string Display(int fontsize, string color)
{
this.fontsize = fontsize;
this.color = color;
return "<FONT SIZE=" + fontsize + " COLOR=" + color + ">" + this.symbol + "</FONT>";
}
}
/// <summary>
/// A 'ConcreteFlyweight' class
/// </summary>
class CharacterA : Character
{
// Constructor
public CharacterA()
{
this.symbol = 'A';
}
//public override string Display(int fontsize, string color)
//{
// this.fontsize = fontsize;
// this.color = color;
// return "<FONT SIZE=" + fontsize + " COLOR=" + color + ">" + this.symbol + "</FONT>";
//}
}
/// <summary>
/// A 'ConcreteFlyweight' class
/// </summary>
class CharacterB : Character
{
// Constructor
public CharacterB()
{
this.symbol = 'B';
}
}
class CharacterZ : Character
{
// Constructor
public CharacterZ()
{
this.symbol = 'Z';
}
}