橋接模式是將抽象部分與它的實現部分分離,使它們都可以獨立地變化。它是一種對象結構型模式,又稱為柄體(Handle and Body)模式或接口(Interfce)模式。
基本介紹
- 中文名:橋接模式
- 運用領域:軟體系統
- 別稱:柄體模式
- 實現化:抽象化給出的具體實現
概述
意圖
抽象化
實現化
脫耦
結構
示例[編輯]
Java
/** "Implementor" */interface DrawingAPI{ public void drawCircle(double x, double y, double radius);}/** "ConcreteImplementor" 1/2 */class DrawingAPI1 implements DrawingAPI{ public void drawCircle(double x, double y, double radius) { System.out.printf("API1.circle at %f:%f radius %f\n", x, y, radius); }}/** "ConcreteImplementor" 2/2 */class DrawingAPI2 implements DrawingAPI{ public void drawCircle(double x, double y, double radius) { System.out.printf("API2.circle at %f:%f radius %f\n", x, y, radius); }}/** "Abstraction" */interface Shape{ public void draw(); // low-level public void resizeByPercentage(double pct); // high-level}/** "Refined Abstraction" */class CircleShape implements Shape{ private double x, y, radius; private DrawingAPI drawingAPI; public CircleShape(double x, double y, double radius, DrawingAPI drawingAPI) { this.x = x; this.y = y; this.radius = radius; this.drawingAPI = drawingAPI; } // low-level i.e. Implementation specific public void draw() { drawingAPI.drawCircle(x, y, radius); } // high-level i.e. Abstraction specific public void resizeByPercentage(double pct) { radius *= pct; }}/** "Client" */class BridgePattern { public static void main(String[] args) { Shape[] shapes = new Shape[2]; shapes[0] = new CircleShape(1, 2, 3, new DrawingAPI1()); shapes[1] = new CircleShape(5, 7, 11, new DrawingAPI2()); for (Shape shape : shapes) { shape.resizeByPercentage(2.5); shape.draw(); } }}
C#
using System; /** "Implementor" */ interface IDrawingAPI { void DrawCircle(double x, double y, double radius); } /** "ConcreteImplementor" 1/2 */ class DrawingAPI1 : IDrawingAPI { public void DrawCircle(double x, double y, double radius) { System.Console.WriteLine("API1.circle at {0}:{1} radius {2}", x, y, radius); } } /** "ConcreteImplementor" 2/2 */ class DrawingAPI2 : IDrawingAPI { public void DrawCircle(double x, double y, double radius) { System.Console.WriteLine("API2.circle at {0}:{1} radius {2}", x, y, radius); } } /** "Abstraction" */ interface IShape { void Draw(); // low-level (i.e. Implementation-specific) void ResizeByPercentage(double pct); // high-level (i.e. Abstraction-specific) } /** "Refined Abstraction" */ class CircleShape : IShape { private double x, y, radius; private IDrawingAPI drawingAPI; public CircleShape(double x, double y, double radius, IDrawingAPI drawingAPI) { this.x = x; this.y = y; this.radius = radius; this.drawingAPI = drawingAPI; } // low-level (i.e. Implementation-specific) public void Draw() { drawingAPI.DrawCircle(x, y, radius); } // high-level (i.e. Abstraction-specific) public void ResizeByPercentage(double pct) { radius *= pct; } } /** "Client" */ class BridgePattern { public static void Main(string[] args) { IShape[] shapes = new IShape[2]; shapes[0] = new CircleShape(1, 2, 3, new DrawingAPI1()); shapes[1] = new CircleShape(5, 7, 11, new DrawingAPI2()); foreach (IShape shape in shapes) { shape.ResizeByPercentage(2.5); shape.Draw(); } } }