[Persistence] Add example provider

...to serve as a secondary persistence store.

example/scratchpad/bundle.json

@@ -10,6 +10,14 @@
                 },
                 "priority": "preferred"
             }
+        ],
+        "components": [
+            {
+                "provides": "persistenceService",
+                "type": "provider",
+                "implementation": "ScratchPersistenceProvider.js",
+                "depends": [ "$q" ]
+            }
         ]
     }
 }

example/scratchpad/src/ScratchPersistenceProvider.js

@@ -0,0 +1,77 @@
+/*****************************************************************************
+ * 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,window*/
+
+define(
+    [],
+    function () {
+        'use strict';
+
+        /**
+         * The ScratchPersistenceProvider keeps JSON documents in memory
+         * and provides a persistence interface, but changes are lost on reload.
+         * @memberof example/scratchpad
+         * @constructor
+         * @implements {PersistenceService}
+         * @param q Angular's $q, for promises
+         */
+        function ScratchPersistenceProvider($q) {
+            this.$q = $q;
+            this.table = {};
+        }
+
+        ScratchPersistenceProvider.prototype.listSpaces = function () {
+            return this.$q.when(['scratch']);
+        };
+
+        ScratchPersistenceProvider.prototype.listObjects = function (space) {
+            return this.$q.when(
+                space === 'scratch' ? Object.keys(this.table) : []
+            );
+        };
+
+        ScratchPersistenceProvider.prototype.createObject = function (space, key, value) {
+            if (space === 'scratch') {
+                this.table[key] = JSON.stringify(value);
+            }
+            return this.$q.when(space === 'scratch');
+        };
+
+        ScratchPersistenceProvider.prototype.readObject = function (space, key) {
+            return this.$q
+                .when(space === 'scratch' ? this.table[key] : undefined);
+        };
+
+        ScratchPersistenceProvider.prototype.deleteObject = function (space, key, value) {
+            if (space === 'scratch') {
+                delete this.table[key];
+            }
+            return this.$q.when(space === 'scratch');
+        };
+
+        ScratchPersistenceProvider.prototype.updateObject =
+            ScratchPersistenceProvider.prototype.createObject;
+
+        return ScratchPersistenceProvider;
+    }
+);