code: function ComponentManager(generator, config) {
          this._parserManager = new ParserManager(config);
          this._config = config || {};
          this._allComponents = {};
          this._componentsForLayer = {};
          this._componentsForComp = {};
          this._componentsForDocument = {};
          this._paths = {};
          this._defaultLayerId = null;
          this._metaDefaultComponents = [];
          this._metaDataRoot = config["meta-data-root"] || META_PLUGIN_ID;
      }
docs: ComponentManagers manage a set of Component objects.
  
  @constructor