constructor( selectionService: SelectionService,
              editorService: ViewEditorService ) {
   this.selectionService = selectionService;
   this.editorService = editorService;
   this.editorService.setEditorVirtualization( selectionService.getSelectedVirtualization() );
 }

 /**
  * Get the number of selected items
  * @return {number} the number of selected items
  */
 public get numberSelectedItems(): number {
   const selections = this.editorService.getSelection();
   if (selections) {
     return selections.length;
   }
   return 0;
 }

 /**
  * Get the first item in the selections
  * @return {SelectionItem} the first item in the selection list
  */
 public getFirstSelection(): SelectionItem {
   const selectedObj = new SelectionItem(this.editorService);
   const selections = this.editorService.getSelection();
   if (selections && selections.length > 0) {
     selectedObj.setSelection(selections[0]);
   }
   return selectedObj;
 }

  /**
   * @returns {string} the name of the dataservice of the view being edited
   */
  public get virtualizationName(): string {
    const virtualization = this.editorService.getEditorVirtualization();

    if ( virtualization ) {
      return virtualization.getId();
    }

    // should always have a virtualization name so shouldn't get here
    return "< error >";
  }

 /**
  * @returns {boolean} `true` if view being edited is readonly
  */
 public get readOnly(): boolean {
   return !this.editorService.getEditorView() || this.editorService.isReadOnly();
 }

 /**
  * @returns {Message[]} the log messages
  */
 public get rows(): Message[] {
   return this.editorService.getMessages();
 }

 /**
  * Determine whether the editor has a view currently selected
  *
  * @return {boolean} 'true' if has a view selection
  */
 public get hasSelectedView(): boolean {
   const selView = this.editorService.getEditorView();
   return (selView && selView !== null);
 }