johnnystefan/pattern-adapter

Skill: Implement Adapter Pattern

Purpose

Allows objects with incompatible interfaces to collaborate. It acts as a wrapper that converts the interface of one object so that another object can understand it.

Procedural Instructions

1. Identify Incompatibility: Locate a useful class (service) whose interface doesn't match the client's requirements.
2. Define Client Interface: Describe the protocol the client uses.
3. Create Adapter: Implement the client interface and maintain a reference to the service object (the "adaptee").
4. Map Methods: In the adapter, translate client calls into a format the service understands.

TypeScript Example

// Client Interface
interface Target {
  request(): string;
}

// Service with incompatible interface (Adaptee)
class Adaptee {
  public specificRequest(): string {
    return '.eetpadA eht fo roivaheb laicepS';
  }
}

// Adapter translates the interface
class Adapter implements Target {
  constructor(private adaptee: Adaptee) {}

  public request(): string {
    const result = this.adaptee.specificRequest().split('').reverse().join('');
    return `Adapter: (TRANSLATED) ${result}`;
  }
}

Payoff

• SRP: Separates the data conversion logic from the primary business logic.
• OCP: New adapters can be introduced without breaking existing client code.