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Model.js
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Model.js
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import ModelBase from "./ModelBase";
let storageProvider = null;
try {
const ReactNative = require("react-native");
storageProvider = ReactNative.AsyncStorage;
} catch (error) {
storageProvider = require("./test/models/AsyncStorageMock").default;
}
export default class Model extends ModelBase {
static get className() {
return "Model";
}
/**
* Write self into Storage.
*
* @param {string} key Storage key.
* @return {Promise}
*/
store(key) {
if (typeof(key) !== "string") {
key = this.constructor.className;
}
const lastChar = key.slice(-1);
["*", "/"].forEach((char) => {
if (char === lastChar) {
throw new Error(`Model key shouldn't ending at "${char}".`);
}
});
const itemsPath = Model.getItemsPath(key);
return new Promise((resolve, reject) => {
const data = this.serialize();
storageProvider.setItem(key, data).then(() => {
if (itemsPath === null) {
resolve();
} else {
return storageProvider.getItem(itemsPath);
}
}).then((itemsJson) => {
let items = [];
if (itemsJson !== undefined && itemsJson !== null) {
items = JSON.parse(itemsJson);
}
if (items.indexOf(key) === -1) {
items.push(key);
}
return storageProvider.setItem(itemsPath, JSON.stringify(items));
}).then(() => {
resolve();
}).catch((error) => {
reject(error);
});
});
}
/**
* Get path of items.
* /example/items
* @param {string} source path
* @return {Promise}
*/
static getItemsPath(path) {
if (path.charAt(0) !== "/") {
return null;
}
const lastIndexOfSlash = path.lastIndexOf("/");
if (lastIndexOfSlash === -1) {
return null;
}
return path.slice(0, lastIndexOfSlash) + "/_items";
}
/**
* Read object from Storage.
*
* @static
* @param {string} key Storage key
* @returns {Promise}
*/
static restore(key) {
if (typeof(key) !== "string") {
key = this.className;
}
const lastChar = key.slice(-1);
const itemsPath = Model.getItemsPath(key);
return new Promise((resolve, reject) => {
if (itemsPath !== null && lastChar === "*") {
storageProvider.getItem(itemsPath).then((itemKeysJson) => {
if (itemKeysJson === undefined || itemKeysJson === null) {
resolve([]);
}
const itemKeys = JSON.parse(itemKeysJson);
const itemsPromises = [];
itemKeys.forEach((item) => {
itemsPromises.push(storageProvider.getItem(item));
});
return Promise.all(itemsPromises);
}).then((itemsSerialized) => {
const itemsDeserialized = [];
itemsSerialized.forEach((item) => {
itemsDeserialized.push(Model.deserialize(item));
});
resolve(itemsDeserialized);
}).catch((error) => {
reject(error);
});
} else {
storageProvider.getItem(key).then((data) => {
if (data === null) {
resolve(null);
} else {
const deserialized = Model.deserialize(data);
resolve(deserialized);
}
}).catch((error) => {
reject(error);
});
}
});
}
/**
* Remove element from storage and related value in _items array.
* @param {string} key
* @return {Promise}
*/
static remove(key) {
if (typeof(key) !== "string") {
key = this.className;
}
const itemsPath = Model.getItemsPath(key);
return new Promise((resolve, reject) => {
storageProvider.removeItem(key).then(() => {
if (itemsPath === null) {
resolve();
} else {
return storageProvider.getItem(itemsPath);
}
}).then((itemsJson) => {
if (itemsJson === undefined || itemsJson === null) {
resolve();
}
const items = JSON.parse(itemsJson);
const itemIndex = items.indexOf(key);
if (itemIndex !== -1) {
items.splice(itemIndex, 1);
}
if (items.length === 0) {
return storageProvider.removeItem(itemsPath);
} else {
return storageProvider.setItem(itemsPath, JSON.stringify(items));
}
}).then(() => {
resolve();
});
});
}
static get _storageProvider() {
return storageProvider;
}
}