On many project I just need to show a list of beans on an AJAX default
datatable... There is already a ListDataProvider... but this component
require a Sortable version... and I always end up rolling out something
like the class bellow. Would it make sense to include a similar class on
wicket code base?
/**
* Sortable version of ListDataProvider.
*/
public class SortableListDataProvider<T extends Serializable, S>
extends SortableDataProvider<T, S> {
private static final long serialVersionUID = 1L;
/** reference to the list used as dataprovider for the dataview */
private final List<T> list;
/**
* Constructs an empty provider. Useful for lazy loading together
with {@linkplain #getData()}
*/
public SortableListDataProvider()
{
this(Collections.<T> emptyList());
}
/**
*
* @param list
* the list used as dataprovider for the dataview
*/
public SortableListDataProvider(List<T> list)
{
if (list == null)
{
throw new IllegalArgumentException("argument [list] cannot
be null");
}
this.list = list;
}
/**
* Subclass to lazy load the list
*
* @return The list
*/
protected List<T> getData()
{
return list;
}
@Override
public Iterator<? extends T> iterator(final long first, final long count)
{
List<T> list = getData();
long toIndex = first + count;
if (toIndex > list.size())
{
toIndex = list.size();
}
return list.subList((int)first, (int)toIndex).listIterator();
}
/**
* @see IDataProvider#size()
*/
@Override
public long size()
{
return getData().size();
}
/**
* @see IDataProvider#model(Object)
*/
@Override
public IModel<T> model(T object)
{
return new Model<T>(object);
}
/**
* @see org.apache.wicket.model.IDetachable#detach()
*/
@Override
public void detach()
{
}
}
--
Regards - Ernesto Reinaldo Barreiro
