Method _switchDataSource

src/cdk/table/table.ts:1202–1225

* Switch to the provided data source by resetting the data and unsubscribing from the current * render change subscription if one exists. If the data source is null, interpret this by * clearing the row outlet. Otherwise start listening for new data.

(dataSource: CdkTableDataSourceInput<T>)

   * clearing the row outlet. Otherwise start listening for new data.
   */
  private _switchDataSource(dataSource: CdkTableDataSourceInput<T>) {
    this._data = [];

    if (isDataSource(this.dataSource)) {
      this.dataSource.disconnect(this);
    }

    // Stop listening for data from the previous data source.
    if (this._renderChangeSubscription) {
      this._renderChangeSubscription.unsubscribe();
      this._renderChangeSubscription = null;
    }

    if (!dataSource) {
      if (this._dataDiffer) {
        this._dataDiffer.diff([]);
      }
      if (this._rowOutlet) {
        this._rowOutlet.viewContainer.clear();
      }
    }

    this._dataSource = dataSource;
  }

  /** Set up a subscription for the data provided by the data source. */
  private _observeRenderChanges() {