1/* 2 * Copyright 2024 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17/** 18 * Ensures the truth of an expression involving one or more parameters to the 19 * calling method. 20 */ 21export function checkArgument(condition: boolean, message?: string) { 22 if (!condition) { 23 throw new Error(`Invalid argument [detail: ${message}]`); 24 } 25} 26 27/** 28 * Ensures that an object reference passed as a parameter to the calling method 29 * is not null or undefined. 30 */ 31export function checkNotNull<T>( 32 reference: T | null | undefined, 33 message?: string 34): T { 35 if (reference === null || reference === undefined) { 36 throw new Error(`null reference exception [detail: ${message}]`); 37 } 38 return reference; 39} 40 41/** 42 * Ensures the truth of an expression involving the state of the calling 43 * instance, but not involving any parameters to the calling method. 44 */ 45export function checkState(condition: boolean, message?: string) { 46 if (!condition) { 47 throw new Error(`Invalid state [detail: ${message}]`); 48 } 49} 50