How to make a sequential number columns in 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.