How to make a sequential number columns in Vaadin - vaadin

Question

I created a table in vaadin. I am selecting columns from the database. I need a column which sequentially gives number to every row.
I am using the
Table table = new Table();
For Grid:
GeneratedPropertyContainer wrappingContainer = new GeneratedPropertyContainer(container);
wrappingContainer.addGeneratedProperty("rowHeader", new PropertyValueGenerator<Long>();
table.setContainerDataSource(wrappingContainer);
table.setColumnOrder("rowHeader", "name", "surname");
layout.addComponent(table);

Answer 1

Use a generated Column for that:
table.addGeneratedColumn("index", new ColumnGenerator(){
#Override
public Object generateCell(final Table source, final Object itemId, final Object columnId)
{
Container.Indexed container = (Container.Indexed) source.getContainerDataSource();
return Integer.toString(container.indexOfId(itemId));
}
});
// add it to the start of the visible columns
table.setVisibleColumns("index", /* other columns ... */);
You get the row number from the container.
The table though has to work with a Container that implements the Indexed sub-interface, for example BeanItemContainer or IndexedContainer.
This is what you do using the Grid:
// the GeneratedPropertyContainer is a decorator for the original container
final GeneratedPropertyContainer gpc = new GeneratedPropertyContainer(container);
grid.setContainerDataSource(gpc);
gpc.addGeneratedProperty("index", new PropertyValueGenerator<String>(){
#Override
public String getValue(final Item item, final Object itemId, final Object propertyId)
{
// get the index from the original container
final Container.Indexed indexContainer = (Container.Indexed) container;
return Integer.toString(indexContainer.indexOfId(itemId));
}
#Override
public Class<String> getType()
{
return String.class;
}
});
// ...
grid.setColumnOrder("index", /* the other property IDs... */);
If you use a PropertyValueGenerator<Long> you need to set a NumberRenderer for that type. grid.getColumn("index").setRenderer(new NumberRenderer("%d")); will do the trick.