ngx-store
Version:
Angular decorators to automagically keep variables in HTML5 LocalStorage, SessionStorage, cookies; injectable services for managing and listening to data changes and a bit more.
145 lines • 18.9 kB
JavaScript
import { Cache } from '../decorator/cache';
import { CONFIG_PREFIX, debug } from '../config/config';
import { Subject } from 'rxjs';
import { NgxStorageEvent } from './storage/storage-event';
export class WebStorageUtility {
constructor(storage, prefix = '', previousPrefix) {
this._prefix = '';
this._changes = new Subject();
this._storage = storage;
this._prefix = prefix;
// handle previousPrefix for backward-compatibility and safe config changes below
if (prefix === previousPrefix) {
return;
}
if (previousPrefix === null) {
return;
}
if (previousPrefix === undefined) {
return;
}
debug.log(this.getStorageName() + ' > Detected prefix change from ' + previousPrefix + ' to ' + prefix);
this.forEach((value, key) => {
// ignore config settings when previousPrefix = ''
if (key.startsWith(previousPrefix) && !key.startsWith(CONFIG_PREFIX)) {
const nameWithoutPrefix = this.trimPrefix(key);
this.set(nameWithoutPrefix, this._storage.getItem(key));
if (previousPrefix !== '') {
this._storage.removeItem(key);
}
}
});
}
get prefix() {
return this._prefix;
}
get changes() {
return this._changes.asObservable();
}
get keys() {
const keys = [];
this.forEach((value, key) => keys.push(key));
return keys;
}
static getSettable(value) {
return JSON.stringify(value);
}
static getGettable(value) {
if (value === 'undefined') {
return null;
}
try {
return JSON.parse(value);
}
catch (e) {
return value;
}
}
getStorage() {
return this._storage;
}
getStorageKey(key, prefix) {
prefix = (typeof prefix === 'string') ? prefix : this.prefix;
return `${prefix}${key}`;
}
getStorageName() {
return this._storage.type || ((this._storage === localStorage) ? 'localStorage' : 'sessionStorage');
}
get(key, config = {}) {
const storageKey = this.getStorageKey(key, config.prefix);
const value = this._storage.getItem(storageKey);
// TODO return undefined if no key
/*if (value === null && !(storageKey in this._storage)) {
return undefined;
}*/
return this.getGettable(value);
}
set(key, value, config = {}) {
if (value === null || value === undefined) {
this.remove(key);
return null;
}
try {
const storageKey = this.getStorageKey(key, config.prefix);
const storable = this.getSettable(value);
this.emitEvent(key, value);
this._storage.setItem(storageKey, storable, config.expires);
const cacheItem = Cache.get(key);
if (cacheItem) {
debug.log(`updating following CacheItem from ${this.constructor.name}:`, cacheItem);
cacheItem.resetProxy();
cacheItem.propagateChange(value, this);
}
}
catch (error) {
console.warn(`[ngx-store] ${this.getStorageName()}:
following error occurred while trying to save ${key} =`, value);
console.error(error);
}
return value;
}
// TODO return true if item existed and false otherwise (?)
remove(key, config = {}) {
const storageKey = this.getStorageKey(key, config.prefix);
this._storage.removeItem(storageKey);
const cacheItem = Cache.get(key);
if (cacheItem) {
cacheItem.resetProxy();
}
}
clear() {
this.emitEvent(null, null, null);
this.forEach((value, key) => {
if (key.startsWith(CONFIG_PREFIX)) {
return;
}
this.remove(key, { prefix: '' });
});
}
forEach(callbackFn) {
if (typeof this._storage.forEach === 'function') {
return this._storage.forEach((value, key) => {
callbackFn(this.getGettable(value), key);
});
}
Object.keys(this._storage).forEach((key) => {
callbackFn(this.getGettable(this._storage[key]), key);
});
}
getSettable(value) {
return WebStorageUtility.getSettable(value);
}
getGettable(value) {
return WebStorageUtility.getGettable(value);
}
trimPrefix(key) {
return key.replace(this.prefix, '');
}
emitEvent(key, newValue, oldValue) {
const event = new NgxStorageEvent(this.getStorageName(), key, this._storage);
event.oldValue = (oldValue !== undefined) ? oldValue : this.get(key);
event.newValue = newValue;
this._changes.next(event);
}
}
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{ DecoratorConfig } from '../ngx-store.types';\nimport { WebStorage } from './storage/cookies-storage';\nimport { Cache } from '../decorator/cache';\nimport { CONFIG_PREFIX, debug } from '../config/config';\nimport { Observable, Subject } from 'rxjs';\nimport { NgxStorageEvent } from './storage/storage-event';\n\nexport type StorageName = 'localStorage' | 'sessionStorage' | 'cookiesStorage' | 'sharedStorage';\n\nexport class WebStorageUtility {\n  protected _storage: WebStorage;\n\n  public constructor(storage: WebStorage, prefix: string = '', previousPrefix?: string) {\n    this._storage = storage;\n    this._prefix = prefix;\n\n    // handle previousPrefix for backward-compatibility and safe config changes below\n    if (prefix === previousPrefix) {\n      return;\n    }\n    if (previousPrefix === null) {\n      return;\n    }\n    if (previousPrefix === undefined) {\n      return;\n    }\n    debug.log(this.getStorageName() + ' > Detected prefix change from ' + previousPrefix + ' to ' + prefix);\n    this.forEach((value, key) => {\n      // ignore config settings when previousPrefix = ''\n      if (key.startsWith(previousPrefix) && !key.startsWith(CONFIG_PREFIX)) {\n        const nameWithoutPrefix = this.trimPrefix(key);\n        this.set(nameWithoutPrefix, this._storage.getItem(key));\n\n        if (previousPrefix !== '') {\n          this._storage.removeItem(key);\n        }\n      }\n    });\n  }\n\n  protected _prefix: string = '';\n\n  public get prefix(): string {\n    return this._prefix;\n  }\n\n  protected _changes: Subject<NgxStorageEvent> = new Subject();\n\n  public get changes(): Observable<NgxStorageEvent> {\n    return this._changes.asObservable();\n  }\n\n  public get keys(): Array<string> {\n    const keys: Array<string> = [];\n    this.forEach((value, key) => keys.push(key));\n    return keys;\n  }\n\n  public static getSettable(value: any): string {\n    return JSON.stringify(value);\n  }\n\n  public static getGettable(value: string): any {\n    if (value === 'undefined') {\n      return null;\n    }\n    try {\n      return JSON.parse(value);\n    } catch (e) {\n      return value;\n    }\n  }\n\n  public getStorage(): WebStorage {\n    return this._storage;\n  }\n\n  public getStorageKey(key: string, prefix?: string): string {\n    prefix = (typeof prefix === 'string') ? prefix : this.prefix;\n    return `${prefix}${key}`;\n  }\n\n  public getStorageName(): StorageName {\n    return this._storage.type || ((this._storage === localStorage) ? 'localStorage' : 'sessionStorage');\n  }\n\n  public get(key: string, config: DecoratorConfig = {}): any {\n    const storageKey = this.getStorageKey(key, config.prefix);\n    const value = this._storage.getItem(storageKey);\n    // TODO return undefined if no key\n    /*if (value === null && !(storageKey in this._storage)) {\n      return undefined;\n    }*/\n    return this.getGettable(value as string);\n  }\n\n  public set<T>(key: string, value: T, config: DecoratorConfig = {}): T | null {\n    if (value === null || value === undefined) {\n      this.remove(key);\n      return null;\n    }\n    try {\n      const storageKey = this.getStorageKey(key, config.prefix);\n      const storable = this.getSettable(value);\n      this.emitEvent(key, value);\n      this._storage.setItem(storageKey, storable, config.expires);\n      const cacheItem = Cache.get(key);\n      if (cacheItem) {\n        debug.log(`updating following CacheItem from ${this.constructor.name}:`, cacheItem);\n        cacheItem.resetProxy();\n        cacheItem.propagateChange(value, this);\n      }\n    } catch (error) {\n      console.warn(`[ngx-store] ${this.getStorageName()}:\n             following error occurred while trying to save ${key} =`, value);\n      console.error(error);\n    }\n    return value;\n  }\n\n  // TODO return true if item existed and false otherwise (?)\n  public remove(key: string, config: DecoratorConfig = {}): void {\n    const storageKey = this.getStorageKey(key, config.prefix);\n    this._storage.removeItem(storageKey);\n    const cacheItem = Cache.get(key);\n    if (cacheItem) {\n      cacheItem.resetProxy();\n    }\n  }\n\n  public clear(): void {\n    this.emitEvent(null as any, null, null);\n    this.forEach((value, key) => {\n      if (key.startsWith(CONFIG_PREFIX)) {\n        return;\n      }\n      this.remove(key, {prefix: ''});\n    });\n  }\n\n  public forEach(callbackFn: (value: any, key: string) => any): void {\n    if (typeof this._storage.forEach === 'function') {\n      return this._storage.forEach((value: any, key: string) => {\n        callbackFn(this.getGettable(value), key);\n      });\n    }\n    Object.keys(this._storage).forEach((key) => {\n      callbackFn(this.getGettable(this._storage[key]), key);\n    });\n  }\n\n  public getSettable(value: any): string {\n    return WebStorageUtility.getSettable(value);\n  }\n\n  public getGettable(value: string): any {\n    return WebStorageUtility.getGettable(value);\n  }\n\n  public trimPrefix(key: string): string {\n    return key.replace(this.prefix, '');\n  }\n\n  protected emitEvent(key: string, newValue: any, oldValue?: any): void {\n    const event = new NgxStorageEvent(this.getStorageName(), key, this._storage);\n    event.oldValue = (oldValue !== undefined) ? oldValue : this.get(key);\n    event.newValue = newValue;\n    this._changes.next(event);\n  }\n}\n"]}