上下文工具类的方法有哪些？

// ContextUtil.ets
export class ContextUtil {
  public static applicationContext: abilityCommon.ApplicationContext;

  public static async buildWantAgent(): Promise<Want> {
    const wantAgentInfo: WantAgent.WantAgentInfo = {
      wants: [
        {
          bundleName: ContextUtil.applicationContext.applicationInfo.name,
          abilityName: 'EntryAbility',
        } as Want
      ],
      operationType: WantAgent.OperationType.START_ABILITIES,
      requestCode: 0,
      wantAgentFlags: [WantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG]
    };
    try {
      const wantAgent = await WantAgent.getWantAgent(wantAgentInfo);
      Logger.info('getWantAgent success! wantAgent: %{public}s', JSON.stringify(wantAgent));
      return wantAgent;
    } catch (e) {
      const err: BusinessError = e as BusinessError;
      Logger.error('getWantAgent failed! err: %{public}s', err.message);
      throw e as Error;
    }
  }
}