text: /*****************************************************************************
   * Open MCT, Copyright (c) 2014-2018, United States Government
   * as represented by the Administrator of the National Aeronautics and Space
   * Administration. All rights reserved.
   *
   * Open MCT 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 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.
   *****************************************************************************/
  
  /**
   * Module defining PersistedModelProvider. Created by vwoeltje on 11/12/14.
   */
  define(
      [],
      function () {
  
          /**
           * A model service which reads domain object models from an external
           * persistence service.
           *
           * Identifiers will be interpreted as follows:
           * * If no colon is present, the model will be read from the default
           *   persistence space.
           * * If a colon is present, everything before the first colon will be
           *   taken to refer to the persistence space, and everything after
           *   will be taken to be that model's key within this space. (If
           *   no such space exists within the `persistenceService`, that
           *   identifier will simply be ignored.)
           *
           * @memberof platform/core
           * @constructor
           * @implements {ModelService}
           * @param {PersistenceService} persistenceService the service in which
           *        domain object models are persisted.
           * @param $q Angular's $q service, for working with promises
           * @param {function} now a function which provides the current time
           * @param {string} space the name of the persistence space(s)
           *        from which models should be retrieved by default
           */
          function PersistedModelProvider(persistenceService, $q, now, space) {
              this.persistenceService = persistenceService;
              this.$q = $q;
              this.now = now;
              this.defaultSpace = space;
          }
  
          PersistedModelProvider.prototype.getModels = function (ids) {
              var persistenceService = this.persistenceService,
                  $q = this.$q,
                  now = this.now,
                  defaultSpace = this.defaultSpace,
                  parsedIds;
  
              // Load a single object model from any persistence spaces
              function loadModel(parsedId) {
                  return persistenceService
                      .readObject(parsedId.space, parsedId.key);
              }
  
              // Ensure that models read from persistence have some
              // sensible timestamp indicating they've been persisted.
              function addPersistedTimestamp(model) {
                  if (model && (model.persisted === undefined)) {
                      model.persisted = model.modified !== undefined ?
                          model.modified : now();
                  }
  
                  return model;
              }
  
              // Package the result as id->model
              function packageResult(parsedIdsToPackage, models) {
                  var result = {};
                  parsedIdsToPackage.forEach(function (parsedId, index) {
                      var id = parsedId.id;
                      if (models[index]) {
                          result[id] = models[index];
                      }
                  });
                  return result;
              }
  
              function loadModels(parsedIdsToLoad) {
                  return $q.all(parsedIdsToLoad.map(loadModel))
                      .then(function (models) {
                          return packageResult(
                              parsedIdsToLoad,
                              models.map(addPersistedTimestamp)
                          );
                      });
              }
  
              function restrictToSpaces(spaces) {
                  return parsedIds.filter(function (parsedId) {
                      return spaces.indexOf(parsedId.space) !== -1;
                  });
              }
  
              parsedIds = ids.map(function (id) {
                  var parts = id.split(":");
                  return (parts.length > 1) ?
                      { id: id, space: parts[0], key: parts.slice(1).join(":") } :
                      { id: id, space: defaultSpace, key: id };
              });
  
              return persistenceService.listSpaces()
                  .then(restrictToSpaces)
                  .then(loadModels);
          };
  
          return PersistedModelProvider;
      }
  );
  