[Persistence] Add localstorage persistence

example/localstorage/src/LocalStoragePersistenceProvider.js

@@ -0,0 +1,62 @@
+/**
+ * Stubbed implementation of a persistence provider,
+ * to permit objects to be created, saved, etc.
+ */
+define(
+    [],
+    function () {
+        'use strict';
+
+        function BrowserPersistenceProvider($q, SPACE) {
+            var spaces = SPACE ? [SPACE] : [],
+                promises = {
+                    as: function (value) {
+                        return $q.when(value);
+                    }
+                };
+
+            var setValue = function(key, value) {
+                localStorage[key] = JSON.stringify(value);
+            };
+
+            var getValue = function(key) {
+                if (localStorage[key]) {
+                    return JSON.parse(localStorage[key]);
+                }
+                return {};
+            };
+
+            var provider = {
+                listSpaces: function () {
+                    return promises.as(spaces);
+                },
+                listObjects: function (space) {
+                    var space_obj = getValue(space);
+                    return promises.as(Object.keys(space_obj));
+                },
+                createObject: function (space, key, value) {
+                    var space_obj = getValue(space);
+                    space_obj[key] = value;
+                    setValue(space, space_obj);
+                    return promises.as(true);
+                },
+                readObject: function (space, key) {
+                    var space_obj = getValue(space);
+                    return promises.as(space_obj[key]);
+                },
+                deleteObject: function (space, key, value) {
+                    var space_obj = getValue(space);
+                    delete space_obj[key];
+                    return promises.as(true);
+                }
+            };
+
+            provider.updateObject = provider.createObject;
+
+            return provider;
+
+        }
+
+        return BrowserPersistenceProvider;
+    }
+);