1/* 2 * Copyright (C) 2022 The Android Open Source Project 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 17import {Store} from './store'; 18 19/** 20 * A persistent store implementation that uses localStorage to store data. 21 */ 22export class PersistentStore implements Store { 23 add(key: string, value: string) { 24 localStorage.setItem(key, value); 25 } 26 27 get(key: string): string | undefined { 28 return localStorage.getItem(key) ?? undefined; 29 } 30 31 clear(keySubstring: string) { 32 Object.keys(localStorage).forEach((key) => { 33 if (key.includes(keySubstring)) localStorage.removeItem(key); 34 }); 35 } 36} 37