All Code related to Part 2 of my series on Vaadin Grid

VaadinGrid-2.1.java

/**
 * Sub Class
 * @author Krishna
 *
 */
public class YearlySales implements Serializable {

 /**
  * 
  */
 private static final long serialVersionUID = -893627659352850558L;

 private Integer q1;

 private Integer q2;

 private Integer q3;

 private Integer q4;
     
        //Getter and Setters

}

/**
 * 
 * @author Krishna
 *
 */
public class VehicleInfo implements Serializable {

 /**
  * 
  */
 private static final long serialVersionUID = -5412465534652505031L;

 /**
  * Various Vehicle Manufactures in India
  *  * @author Krishna
  *
  */
 public enum Manufacturer {
  Maruti, Honda, Hero, Hyundai, TataMotors, Bajaj
 }

 public enum VehicleCategory {
  TwoWheeler, FourWheeler;
 }

 private Integer id;

 private String modelName;

 private Manufacturer manufacturer;

 private YearlySales sales2013;

 private YearlySales sales2014;

 private YearlySales sales2012;

 private VehicleCategory category;

 //Getter and Setters

}

VaadinGrid-2.2.java

Grid grid = new Grid();
BeanItemContainer<Vehicleinfo> container = new BeanItemContainer<Vehicleinfo>(VehicleInfo.class);
//Generates Random Data
container.addAll(DatasourceFactory.getVehicleSalesDS());

//Add nested properties to the header
container.addNestedContainerBean("sales2012");
container.addNestedContainerBean("sales2013");
container.addNestedContainerBean("sales2014");

VaadinGrid-2.3.java

grid.setSelectionMode(SelectionMode.SINGLE);
grid.removeColumn("id");
grid.setImmediate(true);

VaadinGrid-2.4.java

//This call prepends the header row to the existing grid
HeaderRow mainHeaderRow = grid.prependHeaderRow();
//Get hold of the columnID, mind you in my case this is a nestedID
HeaderCell sales2012Q1 = mainHeaderRow.getCell("sales2012.q1");
HeaderCell sales2012Q2 = mainHeaderRow.getCell("sales2012.q2");
HeaderCell sales2012Q3 = mainHeaderRow.getCell("sales2012.q3");
HeaderCell sales2012Q4 = mainHeaderRow.getCell("sales2012.q4");

//Now join all of these cells to form a logical block
HeaderCell mainHeaderCell = mainHeaderRow.join(sales2012Q1, sales2012Q2,sales2012Q3, sales2012Q4);

//Set caption for this logical block
mainHeaderCell.setText("2012");

VaadinGrid-2.5.java

//Get the container datasource
BeanItemContainer<Vehicleinfo> container = (BeanItemContainer< Vehicleinfo>) grid.getContainerDataSource();
// String to Long Converter
Converter<String,long> convertor = new StringToLongConverter();
//Iterating over years
for (int i = 2012; i < 2015; i++) {
  //Join all the columns associated with an year for secondary footer
  FooterCell yearlySalesCell = secondaryFooter.join("sales" + i + ".q1", "sales" + i + ".q2", "sales" + i + ".q3", "sales" + i + ".q4");
  long yearlySalesValue = 0l;
  // Iterating over all items and calculating values over each quarter
  for (int quarter = 1; quarter <= 4; quarter++) {
    long quarterSales = 0l;
    final String columnName = "sales" + i + ".q" + quarter;
    FooterCell sumOfQuarterlySales = mainFooter.getCell(columnName);
    // Iterate over each Item for a quarter and calculate total no of vehicle sales per quarter
    for (Object itemId : container.getItemIds()) {
      Item item = container.getItem(itemId);
      Integer q1Value = (Integer) item.getItemProperty(columnName).getValue();
      quarterSales += Long.valueOf(q1Value);
      
    }
    //Sum of quarterly sales of all vehicles is being set as text for primary footer
    sumOfQuarterlySales.setText(convertor.convertToPresentation(quarterSales, String.class, grid.getLocale()));
    yearlySalesValue += quarterSales;
    
  }
  //Sum of Yearly sales of all vehicles is being set as text for secondary footer
  yearlySalesCell.setText(convertor.convertToPresentation(yearlySalesValue, String.class, grid.getLocale()));
  
}

VaadinGrid-2.6.java

// Use setHtml to customize your headers
yearlySalesCell.setHtml("<b>"+ convertor.convertToPresentation(yearlySalesValue,String.class, grid.getLocale()) + " <b>");