Bug 154329 [Viewers] Provide widget independent TableViewer implementation
At the moment the concrete classes to provide a table or a tree require that the underlying Widget is an org.eclipse.widgets.Table and org.eclipse.widgets.Tree. It would make sense to extract all code parts who don't depend on the concrete-widget to an AbstractBaseClass between: - ColumnViewer > TableViewer => ColumnViewer > AbstractBaseTableViewer > TableViewer - AbstractTreeViewer > TreeViewer => AbstractTreeViewer > AbstractBaseTreeViewer > TreeViewer
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
associate(element, item);
			} else {
				Object data = item.getData();
				if (data != null) {
					unmapElement(data, item);
				}
				item.setData(element);
				mapElement(element, item);
			}
			int columnCount = table.getColumnCount();
			if (columnCount == 0)
				columnCount = 1;
			
			
			for (int column = 0; column < columnCount || column == 0; column++) {
				ViewerColumn columnViewer = getViewerColumn(column);
				columnViewer.refresh(updateCell(getViewerRowFromItem(item),
						column));
				
				
				if (item.isDisposed()) {
					unmapElement(element, item);
					return;
				}
			}
		}
	}
	/*
	 * (non-Javadoc)
	 *