adapter example

adapter.ts

class Item {
  key: string;
  value: string;
}
interface IStorage {
  getItem(key: string): Item;
  setItem(item: Item): boolean;
  remove(key: string): boolean;
}
// aqui uso el stragety
export class StoreWrapper {
  private storeManager: IStorage;
  constructor(storage: IStorage) {
    this.setStorage(storage);
  }

  setStorage(storage: IStorage): void {
    this.storeManager = storage;
  }

  getItem(key: string): Item {
    return this.storeManager.getItem(key);
  }

  setItem(item: Item): boolean {
    return this.storeManager.setItem(item);
  }

  removeItem(key: string): boolean {
    return this.storeManager.remove(key);
  }
}

class StoreManagerGoogle implements IStorage {
  getItem(key: string): Item {
    return { key, value: 'google' };
  }
  setItem(item: Item): boolean {
    return true;
  }
  remove(key: string): boolean {
    return true;
  }
}

class StoreManagerFacebook implements IStorage {
  getItem(key: string): Item {
    return { key, value: 'facebook' };
  }
  setItem(item: Item): boolean {
    return true;
  }
  remove(key: string): boolean {
    return true;
  }
}


// el singelton
export class StoreManagerWrapper {
  private static storeWrapper: StoreWrapper;
  private constructor() {}

  public static getInstanceOf(storage: IStorage): StoreWrapper {
    if (!this.storeWrapper) {
      this.storeWrapper = new StoreWrapper(storage);
    }
    return this.storeWrapper;
  }
}

const googleStorage = new StoreManagerGoogle();
const facebookStorage = new StoreManagerFacebook();
const storeManager = StoreManagerWrapper.getInstanceOf(googleStorage);

storeManager.setItem({ key: 'a', value: 'item' });
let value = storeManager.getItem('hello');
console.log(value);storeManager.setStorage(facebookStorage);
storeManager.setItem({ key: 'a', value: 'item' });