[Persistence] Initial import of CouchDB adapter

Initial import of CouchDB adapter from the pre-Angular
OpenMCT. Revise to use Angular services ().
WTD-537.

bundles.json

@@ -6,6 +6,5 @@
     "platform/commonUI/edit",
     "platform/commonUI/dialog",
     "platform/commonUI/general",
-
-    "example/persistence"
+    "platform/persistence"
 ]

platform/persistence/bundle.json

@@ -0,0 +1,24 @@
+{
+    "name": "Couch Persistence",
+    "description": "Adapter to read and write objects using a CouchDB instance.",
+    "extensions": {
+        "components": [
+            {
+                "provides": "persistenceService",
+                "type": "provider",
+                "implementation": "CouchPersistenceProvider.js",
+                "depends": [ "$http", "$q", "PERSISTENCE_SPACE", "COUCHDB_PATH" ]
+            }
+        ],
+        "constants": [
+            {
+                "key": "PERSISTENCE_SPACE",
+                "value": "mct"
+            },
+            {
+                "key": "COUCHDB_PATH",
+                "value": "/couch/openmct"
+            }
+        ]
+    }
+}

platform/persistence/src/CouchPersistenceProvider.js

@@ -0,0 +1,99 @@
+/*global define*/
+
+define(
+    [],
+    function () {
+        'use strict';
+
+        function CouchPersistenceProvider($http, $q, SPACE, PATH) {
+            var spaces = [ SPACE ],
+                revs = {};
+
+            function url(subpath) {
+                return PATH + '/' + subpath;
+            }
+
+            function request(subpath, method, value) {
+                return $http({
+                    method: method,
+                    url: url(subpath),
+                    data: value
+                }).then(function (response) {
+                    return response.data;
+                }, function () {
+                    return undefined;
+                });
+            }
+
+            function get(subpath) { return request(subpath, "GET"); }
+            function put(subpath, value) { return request(subpath, "PUT", value); }
+            function del(subpath, value) { return request(subpath, "DELETE", value); }
+
+            function getIdsFromAllDocs(allDocs) {
+                return allDocs.rows.map(function (r) { return r.id; });
+            }
+
+            /*jslint nomen: true */ // Allow the _id and _rev that couch provides
+            function getModel(response) {
+                if (response && response.model) {
+                    revs[response._id] = response._rev;
+                    return response.model;
+                } else {
+                    return undefined;
+                }
+            }
+
+            function checkResponse(response) {
+                if (response && response.ok) {
+                    revs[response.id] = response.rev;
+                    return response.ok;
+                } else {
+                    return undefined;
+                }
+            }
+
+            function CouchDocument(key, value, includeRevision, markDeleted) {
+                return {
+                    "_id": key,
+                    "_rev": includeRevision ? revs[key] : undefined,
+                    "_deleted": markDeleted,
+                    "metadata": {
+                        "category": "domain object",
+                        "type": value.type,
+                        "owner": "admin",
+                        "name": value.name,
+                        "created": Date.now()
+                    },
+                    "model": value
+                };
+            }
+
+            return {
+                listSpaces: function () {
+                    return $q.when(spaces);
+                },
+                listObjects: function (space) {
+                    return get("_all_docs").then(getIdsFromAllDocs);
+                },
+                createObject: function (space, key, value) {
+                    return put(key, new CouchDocument(key, value))
+                        .then(checkResponse);
+                },
+                readObject: function (space, key) {
+                    return get(key).then(getModel);
+                },
+                updateObject: function (space, key, value) {
+                    return put(key, new CouchDocument(key, value, true))
+                        .then(checkResponse);
+                },
+                deleteObject: function (space, key, value) {
+                    return put(key, new CouchDocument(key, value, true, true))
+                        .then(checkResponse);
+                }
+            };
+
+        }
+
+        return CouchPersistenceProvider;
+    }
+);