typescript: Bridge Pattern

 

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/**
 * Bridge Pattern 桥接是一种结构型设计模式， 可将业务逻辑或一个大类拆分为不同的层次结构， 从而能独立地进行开发。
 * https://dev.to/takaakit/uml-diagram-for-gof-design-pattern-examples-in-typescript-46d5#singleton
 * The Abstraction defines the interface for the "control" part of the two class
 * hierarchies. It maintains a reference to an object of the Implementation
 * hierarchy and delegates all of the real work to this object.
 */
class AbstractionBridge {
    /**
     *
     */
    protected implementation: Implementation;
    /**
     *
     * @param implementation
     */
    constructor(implementation: Implementation) {
        this.implementation = implementation;
    }
    /**
     *
     * @returns
     */
    public operation(): string {
        const result = this.implementation.operationImplementation();
        return `Abstraction: Base operation with:\n${result}`;
    }
}
 
/**
 * You can extend the Abstraction without changing the Implementation classes.
 */
class ExtendedAbstraction extends AbstractionBridge {
 
    /**
     *
     * @returns
     */
    public operation(): string {
        const result = this.implementation.operationImplementation();
        return `ExtendedAbstraction: Extended operation with:\n${result}`;
    }
}
 
/**
 * The Implementation defines the interface for all implementation classes. It
 * doesn't have to match the Abstraction's interface. In fact, the two
 * interfaces can be entirely different. Typically the Implementation interface
 * provides only primitive operations, while the Abstraction defines higher-
 * level operations based on those primitives.
 */
interface Implementation {
    /**
     *
     */
    operationImplementation(): string;
}
 
/**
 * Each Concrete Implementation corresponds to a specific platform and
 * implements the Implementation interface using that platform's API.
 */
class ConcreteImplementationA implements Implementation {
    /**
     *
     * @returns
     */
    public operationImplementation(): string {
        return 'ConcreteImplementationA: Here\'s the result on the platform A.';
    }
}
 
class ConcreteImplementationB implements Implementation {
    /**
     *
     * @returns
     */
    public operationImplementation(): string {
        return 'ConcreteImplementationB: Here\'s the result on the platform B.';
    }
}
 
/**
 * Except for the initialization phase, where an Abstraction object gets linked
 * with a specific Implementation object, the client code should only depend on
 * the Abstraction class. This way the client code can support any abstraction-
 * implementation combination.
 */
function clientCodeBridge(abstraction: AbstractionBridge) {
    // ..
 
    console.log(abstraction.operation());
 
    return abstraction.operation();
 
    // ..
}
 
/**
 * The client code should be able to work with any pre-configured abstraction-
 * implementation combination.
 */
let implementation = new ConcreteImplementationA();
let abstraction = new AbstractionBridge(implementation);
clientCodeBridge(abstraction);
let sbridge1=clientCodeBridge(abstraction);
console.log('');
 
implementation = new ConcreteImplementationB();
abstraction = new ExtendedAbstraction(implementation);
clientCodeBridge(abstraction);
 
let sbridge="gevindu";
let sbridge2=clientCodeBridge(abstraction);
 
let messagebridge: string = 'Hello World,This is a typescript!,涂聚文 Geovin Du Web';
document.body.innerHTML = messagebridge+","+sbridge1+","+sbridge2+",TypeScript Bridge Pattern 桥接模式"

　　

调用：

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<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <head><title>TypeScript:桥接模式</title>
      <meta name="Description" content="geovindu,涂聚文,Geovin Du"/>
<meta name="Keywords" content="geovindu,涂聚文,Geovin Du"/>
<meta name="author" content="geovindu,涂聚文,Geovin Du"/> 
    </head>
    <body>
        <script src="dist/Bridgets.js"></script>
    </body>
</html>

　　

 

输出：

 

posted @   ®Geovin Du Dream Park™  阅读(8)  评论(0)  编辑  收藏  举报
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