patterns

[TYPESCRIPT] 타입스크립트 디자인 패턴 - Adapter

Adapter Pattern

The adapter pattern is one of the structural software design patterns.

Structural: 객체간의 관계를 처리

이점

  1. 클라이언트 인터페이스를 변경하지 않고 새로운 시스템의 기능을 제공하게 한다.
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// adapter.ts
import { IGeoCoder, GeoCoder } from './impl-class';
import { Locator } from './new-class';
 
export class GeocodingAdapter implements IGeoCoder {
  private latitude: number;
  private longitude: number;
  private type: string;
  constructor(latitude, longitude, type) {
    this.latitude = latitude;
    this.longitude = longitude;
    this.type = type;
  }
 
  locate(): string {
    if (this.type === 'GeoCoder') {
      const geocoder = new GeoCoder(this.latitude, this.longitude);
      return geocoder.locate();
 
    } else if (this.type === 'Locator') {
      const locator = new Locator(this.latitude, this.longitude);
      return locator.geocode();
    } else {
      throw new Error('Please use either GeoCoder or Locator');
    }
  }
}
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// client.ts
import { GeocodingAdapter } from './adapter';
 
const gAdapter = new GeocodingAdapter(51.5074, 0.1278, 'Locator');
const gAdapter2 = new GeocodingAdapter(51.5074, 0.1278, 'GeoCoder');
const locationFromLocator = gAdapter.locate();
const locationFromGeoCoder = gAdapter2.locate();
 
console.log(locationFromLocator);
console.log(locationFromGeoCoder);