import { Injectable, InjectionToken, Inject } from '@angular/core';

export function _sessionStorage() {
  return sessionStorage;
}

// #docregion storage-token
export const BROWSER_SESSIONSTORAGE = new InjectionToken<Storage>('Browser SessionStorage', {
  providedIn: 'root',
  factory: _sessionStorage
});
// #enddocregion storage-token


@Injectable()
export class NaSessionStorageService {

  constructor(@Inject(BROWSER_SESSIONSTORAGE) public storage: any) { }

  public set(key: string, value: string): void {
    this.storage.setItem(key, value);
  }

  public get(key: string): string {
    return this.storage.getItem(key);
  }

  public setObject(key: string, value: any): void {
    // 将value转变为字符串存储
    this.storage.setItem(key, ((value == null) ? null : JSON.stringify(value)));
  }

  public getObject(key: string): any {
    return JSON.parse(this.storage.getItem(key));
  }

  public remove(key: string): any {
    this.storage.removeItem(key);
  }

}