/**
 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export class CheckEmptyUtils{

  /**
   * Check obj is empty.
   *
   * @param {any} obj
   * @return {boolean} true(empty)
   */
  static isEmpty(obj: any): boolean {
    return (typeof obj === 'undefined' || obj == null || obj === '');
  }

  /**
   * Check str is empty.
   *
   * @param {string} str
   * @return {boolean} true(empty)
   */
  static checkStrIsEmpty(str: string): boolean {
    return str == undefined || str == null || str.trim().length == 0;
  }

  /**
   * Check array is empty.
   *
   * @param {Array} arr An array to check if is empty.
   * @return {boolean} true(empty)
   */
  static isEmptyArr<T>(arr: T[]): boolean {
    return arr == undefined || arr == null || arr.length == 0;
  }
}