Hi,
my only objection would be that this SortableListDataProvider doesn't
actually sort anything.
AFAIK this does no harm though, so why not let the current
ListDataProvider implement ISortableDataProvider?
Have fun
Sven
On 08.06.2015 08:50, Ernesto Reinaldo Barreiro wrote:
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()
{
}
}
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