feat(WebstorageService): improve clearing storage (remove keys created by this repository only)

Author: DanielKucal

src/decorator/webstorage.ts

@@ -1,21 +1,23 @@
 import {WebStorageUtility} from '../utility/webstorage.utility';
+import {LocalStorageService, SessionStorageService, WebStorageServiceInterface} from '../service/webstorage.service';
 
 
 export function LocalStorage(key?: string) {
-    return WebStorage(localStorage, key);
+    return WebStorage(localStorage, LocalStorageService, key);
 }
 
 export function SessionStorage(key?: string) {
-    return WebStorage(sessionStorage, key);
+    return WebStorage(sessionStorage, SessionStorageService, key);
 }
 
 // initialization cache
 let cache = {};
 
-export let WebStorage = (webStorage: Storage, key: string) => {
+export let WebStorage = (webStorage: Storage, service: WebStorageServiceInterface, key: string) => {
     return (target: Object, propertyName: string): void => {
         key = key || propertyName;
         let proxy = target[propertyName];
+        service.keys.push(key);
 
         Object.defineProperty(target, propertyName, {
             get: function() {

src/service/webstorage.service.ts

@@ -1,8 +1,20 @@
 import {Injectable} from '@angular/core';
 import {WebStorageUtility} from '../utility/webstorage.utility';
 
-export class WebStorageService {
-    constructor(private storage: Storage) {
+export interface WebStorageServiceInterface {
+    keys: Array<string>;
+    new(): {
+        get(key: string): any;
+        set(key: string, value: any): void;
+        remove(key: string): void;
+        clear(): void;
+    }
+}
+
+export abstract class WebStorageService {
+    public static keys: Array<string>;
+
+    constructor(protected storage: Storage) {
 
     }
 
@@ -19,19 +31,25 @@ export class WebStorageService {
     }
 
     clear(): void {
-        this.storage.clear();
+        for (let key of (<WebStorageServiceInterface>this.constructor).keys) {
+            this.storage.removeItem(key);
+        }
     }
 }
 
 @Injectable()
 export class LocalStorageService extends WebStorageService {
+    public static keys: Array<string> = [];
+
     constructor() {
         super(localStorage);
     }
 }
 
 @Injectable()
 export class SessionStorageService extends WebStorageService {
+    public static keys: Array<string> = [];
+
     constructor() {
         super(sessionStorage);
     }