1/* 2 * Copyright (c) 2023 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16export class CommonUtils { 17 /** 18 * Determines whether the object is unavailable 19 * @param {str} string to be judged 20 */ 21 static isInvalid(str: string): boolean { 22 return str == null; 23 } 24 25 /** 26 * String null 27 * @param {str} Word string 28 */ 29 static isEmpty(str: string): boolean { 30 return CommonUtils.isInvalid(str) || str.trim().length == 0; 31 } 32 33}