[Persistence] Move local storage to platform

#79

platform/persistence/local/src/LocalStoragePersistenceProvider.js

@@ -0,0 +1,86 @@
+/*****************************************************************************
+ * Open MCT Web, Copyright (c) 2014-2015, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT Web is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT Web includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+/*global define,localStorage*/
+/**
+ * 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);
+                    }
+                },
+                provider;
+
+            function setValue(key, value) {
+                localStorage[key] = JSON.stringify(value);
+            }
+
+            function getValue(key) {
+                if (localStorage[key]) {
+                    return JSON.parse(localStorage[key]);
+                }
+                return {};
+            }
+
+            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;
+    }
+);