The GroupingPlugin class provides the functionality to group data in a DataTable based on a grouping criteria. It allows expanding and collapsing groups of rows, making it easier to navigate and manage large datasets.

Usage example:

 
 DataTable  dataTable = ... // Create a DataTable instance
 GroupingPlugin  groupingPlugin = new GroupingPlugin< >(new GroupSupplier () {
     {@literal @} Override
     public String getRecordGroupId(TableRow  tableRow) {
         return tableRow.getModel().getCountry(); // Grouping criteria based on the 'country' field
     }
 }, new CellRenderer () {
     {@literal @} Override
     public void render(CellInfo
               cellInfo) { // Custom rendering for the group header cell cellInfo.getElement().textContent = "Group: " + cellInfo.getModel().getCountry(); } }); // Initialize and add the grouping plugin to the DataTable dataTable.addPlugin(groupingPlugin);