question: public TreeViewerBuilder ( Composite parent , int style ) { mappings = Collections . emptyMap ( ) ; checkable = ( style & SWT . CHECK ) == SWT . CHECK ; if ( checkable ) { viewer = new CheckboxTreeViewer ( parent , style ) ; } else { viewer = new TreeViewer ( parent , style ) ; } ColumnViewerToolTipSupport . enableFor ( viewer , ToolTip . NO_RECREATE ) ; }
target:  Creates a new TreeViewerBuilder.