application-amicale/utils/AsyncStorageManager.js
2020-03-12 12:31:02 +01:00

125 lines
3.4 KiB
JavaScript

// @flow
import {AsyncStorage} from "react-native";
/**
* Static class used to manage preferences.
* Preferences are fetched at the start of the app and saved in an instance object.
* This allows for a synchronous access to saved data.
*/
export default class AsyncStorageManager {
static instance: AsyncStorageManager | null = null;
/**
* Get this class instance or create one if none is found
* @returns {ThemeManager}
*/
static getInstance(): AsyncStorageManager {
return AsyncStorageManager.instance === null ?
AsyncStorageManager.instance = new AsyncStorageManager() :
AsyncStorageManager.instance;
}
// Object storing preferences keys, default and current values for use in the app
preferences = {
showIntro: {
key: 'showIntro',
default: '1',
current: '',
},
updateNumber: {
key: 'updateNumber',
default: '0',
current: '',
},
proxiwashNotifications: {
key: 'proxiwashNotifications',
default: '5',
current: '',
},
proxiwashWatchedMachines: {
key: 'proxiwashWatchedMachines',
default: '[]',
current: '',
},
nightModeFollowSystem: {
key: 'nightModeFollowSystem',
default: '1',
current: '',
},
nightMode: {
key: 'nightMode',
default: '0',
current: '',
},
expoToken: {
key: 'expoToken',
default: '',
current: '',
},
debugUnlocked: {
key: 'debugUnlocked',
default: '0',
current: '',
},
defaultStartScreen: {
key: 'defaultStartScreen',
default: 'Home',
current: '',
},
proxiwashShowBanner: {
key: 'proxiwashShowBanner',
default: '1',
current: '',
},
planexShowBanner: {
key: 'planexShowBanner',
default: '1',
current: '',
},
showAprilFoolsStart: {
key: 'showAprilFoolsStart',
default: '1',
current: '',
},
};
/**
* Set preferences object current values from AsyncStorage.
* This function should be called at the app's start.
*
* @return {Promise<void>}
*/
async loadPreferences() {
let prefKeys = [];
// Get all available keys
for (let [key, value] of Object.entries(this.preferences)) {
prefKeys.push(value.key);
}
// Get corresponding values
let resultArray: Array<Array<string>> = await AsyncStorage.multiGet(prefKeys);
// Save those values for later use
for (let i = 0; i < resultArray.length; i++) {
let key: string = resultArray[i][0];
let val: string | null = resultArray[i][1];
if (val === null)
val = this.preferences[key].default;
this.preferences[key].current = val;
}
}
/**
* Save the value associated to the given key to preferences.
* This updates the preferences object and saves it to AsynStorage.
*
* @param key
* @param val
*/
savePref(key: string, val: string) {
this.preferences[key].current = val;
AsyncStorage.setItem(key, val);
}
}