桥接模式
模式定义
桥接模式(Bridge Pattern):将抽象部分与它的实现部分分离,使它们都可以独立地变化。它是一种对象结构型模式,又称为柄体(Handle and Body)模式或接口(Interface)模式。
当一个对象由多个对象组合而成,使用桥接模式能减少类数量。
UML类图
- 抽象类(Abstraction) 定义一个成员变量(实现类接口类型) 和赋值方法
- 扩展抽象类(Refined Abstraction) 实现了在抽象类中定义的抽象业务方法,在扩充抽象类中可以调用 在实现类接口中定义的业务方法
- 实现类接口(Implementor) 实现部分的基本操作接口
- 具体实现类(Concrete Implement) 实现了实现类接口
代码结果
public static class BridgeApp
{
public static void Run()
{
Abstraction ab = new RefinedAbstraction();
ab.Implementor = new ConcreteImplementorA();
ab.Operation();
}
}
public class Abstraction
{
protected Implementor implementor;
public Implementor Implementor
{
set { implementor = value; }
}
public virtual void Operation()
{
implementor.Operation();
}
}
public interface Implementor
{
void Operation();
}
public class RefinedAbstraction : Abstraction
{
public override void Operation()
{
implementor.Operation();
}
}
public class ConcreteImplementorA : Implementor
{
public void Operation()
{
Console.WriteLine("ConcreteImplementorA Operation");
}
}
public class ConcreteImplementorB : Implementor
{
public void Operation()
{
Console.WriteLine("ConcreteImplementorB Operation");
}
}
情景模式
现在智能手机品牌越来越多了,其实大家都明白好的手机都是那不同的部件组装下。这里假设手机主要CPU和内存。哈哈只需要修改CPU与内存就可以生产不同类型的手机
public static class BridgeApp
{
public static void Run()
{
PhoneOne phone1 = new PhoneOne();
phone1.Display();
PhoneTwo phone2 = new PhoneTwo();
phone2.Display();
}
}
public class PhoneOne
{
private CPU _cpu = new HPCPU();
private RAM _ram = new RAM128();
public void Display()
{
Console.WriteLine("Phone one:");
_cpu.Display();
_ram.Display();
Console.WriteLine("------------------------------------------");
}
}
public class PhoneTwo
{
private CPU _cpu = new HPCPU();
private RAM _ram = new RAM64();
public void Display()
{
Console.WriteLine("Phone two:");
_cpu.Display();
_ram.Display();
Console.WriteLine("------------------------------------------");
}
}
public abstract class CPU
{
public abstract void Display();
}
public abstract class RAM
{
public abstract void Display();
}
public class RAM64 : RAM
{
public override void Display()
{
Console.WriteLine("RMS size is 64");
}
}
public class RAM128 : RAM
{
public override void Display()
{
Console.WriteLine("RMS size is 128");
}
}
public class LestinaCPU : CPU
{
public override void Display()
{
Console.WriteLine("CPU Type is LestinaCPU");
}
}
public class HPCPU : CPU
{
public override void Display()
{
Console.WriteLine("CPU Type is HPCPU");
}
}