Cache data on session storage by url with key

CacheRestObject.ts

  /**
   *
   * Verifica la presenza di un singolo valore in session storage, 
   * se non esiste esegue la chiamata
   *
   * @param {string} url
   * @returns {*}
   * @memberof ApiService
   */
  public getLookUp(url: string): any {
    if (sessionStorage.getItem(url)) {
      return JSON.parse(sessionStorage.getItem(url));
    } else {
      this.getUrlDetail(url).then(result => {
        sessionStorage.setItem(url, JSON.stringify(result));
        return result;
      });
    }
  }