text: import DeveloperError from "../Core/DeveloperError.js";
  
  /**
   * Defines the interface for data sources, which turn arbitrary data into a
   * {@link EntityCollection} for generic consumption. This object is an interface
   * for documentation purposes and is not intended to be instantiated directly.
   * @alias DataSource
   * @constructor
   *
   * @see Entity
   * @see DataSourceDisplay
   */
  function DataSource() {
    DeveloperError.throwInstantiationError();
  }
  
  Object.defineProperties(DataSource.prototype, {
    /**
     * Gets a human-readable name for this instance.
     * @memberof DataSource.prototype
     * @type {String}
     */
    name: {
      get: DeveloperError.throwInstantiationError,
    },
    /**
     * Gets the preferred clock settings for this data source.
     * @memberof DataSource.prototype
     * @type {DataSourceClock}
     */
    clock: {
      get: DeveloperError.throwInstantiationError,
    },
    /**
     * Gets the collection of {@link Entity} instances.
     * @memberof DataSource.prototype
     * @type {EntityCollection}
     */
    entities: {
      get: DeveloperError.throwInstantiationError,
    },
    /**
     * Gets a value indicating if the data source is currently loading data.
     * @memberof DataSource.prototype
     * @type {Boolean}
     */
    isLoading: {
      get: DeveloperError.throwInstantiationError,
    },
    /**
     * Gets an event that will be raised when the underlying data changes.
     * @memberof DataSource.prototype
     * @type {Event}
     */
    changedEvent: {
      get: DeveloperError.throwInstantiationError,
    },
    /**
     * Gets an event that will be raised if an error is encountered during processing.
     * @memberof DataSource.prototype
     * @type {Event}
     */
    errorEvent: {
      get: DeveloperError.throwInstantiationError,
    },
    /**
     * Gets an event that will be raised when the value of isLoading changes.
     * @memberof DataSource.prototype
     * @type {Event}
     */
    loadingEvent: {
      get: DeveloperError.throwInstantiationError,
    },
    /**
     * Gets whether or not this data source should be displayed.
     * @memberof DataSource.prototype
     * @type {Boolean}
     */
    show: {
      get: DeveloperError.throwInstantiationError,
    },
  
    /**
     * Gets or sets the clustering options for this data source. This object can be shared between multiple data sources.
     *
     * @memberof DataSource.prototype
     * @type {EntityCluster}
     */
    clustering: {
      get: DeveloperError.throwInstantiationError,
    },
  });
  
  /**
   * Updates the data source to the provided time.  This function is optional and
   * is not required to be implemented.  It is provided for data sources which
   * retrieve data based on the current animation time or scene state.
   * If implemented, update will be called by {@link DataSourceDisplay} once a frame.
   * @function
   *
   * @param {JulianDate} time The simulation time.
   * @returns {Boolean} True if this data source is ready to be displayed at the provided time, false otherwise.
   */
  DataSource.prototype.update = DeveloperError.throwInstantiationError;
  
  /**
   * @private
   */
  DataSource.setLoading = function (dataSource, isLoading) {
    if (dataSource._isLoading !== isLoading) {
      if (isLoading) {
        dataSource._entityCollection.suspendEvents();
      } else {
        dataSource._entityCollection.resumeEvents();
      }
      dataSource._isLoading = isLoading;
      dataSource._loading.raiseEvent(dataSource, isLoading);
    }
  };
  export default DataSource;
  