org.apache.wicket.markup.repeater.data

Class EmptyDataProvider<T>

java.lang.Object

org.apache.wicket.markup.repeater.data.EmptyDataProvider<T>

Type Parameters:

T -

All Implemented Interfaces:

Serializable, IDataProvider<T>, IDetachable, IClusterable

public class EmptyDataProvider<T>
extends Object
implements IDataProvider<T>

A convenience class to represent an empty data provider.

Author:

Phil Kulak

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
EmptyDataProvider()

Method Summary

Methods

Modifier and Type	Method and Description
void	detach() Detaches model after use.
static <T> EmptyDataProvider<T>	getInstance()
Iterator<T>	iterator(long first, long count) Gets an iterator for the subset of total data
IModel<T>	model(Object object) Callback used by the consumer of this data provider to wrap objects retrieved from IDataProvider.iterator(long, long) with a model (usually a detachable one).
long	size() Gets total number of items in the collection represented by the DataProvider

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EmptyDataProvider

public EmptyDataProvider()

Method Detail

getInstance

public static <T> EmptyDataProvider<T> getInstance()

Type Parameters:

T -

Returns:

the singleton instance of this class

iterator

public Iterator<T> iterator(long first,
                   long count)

Description copied from interface: IDataProvider

Gets an iterator for the subset of total data

Specified by:

iterator in interface IDataProvider<T>

Parameters:

first - first row of data

count - minimum number of elements to retrieve

Returns:

iterator capable of iterating over {first, first+count} items

See Also:

IDataProvider.iterator(long, long)

size

public long size()

Description copied from interface: IDataProvider

Gets total number of items in the collection represented by the DataProvider

Specified by:

size in interface IDataProvider<T>

Returns:

total item count

See Also:

IDataProvider.size()

model

public IModel<T> model(Object object)

Description copied from interface: IDataProvider

Callback used by the consumer of this data provider to wrap objects retrieved from IDataProvider.iterator(long, long) with a model (usually a detachable one).

Specified by:

model in interface IDataProvider<T>

Parameters:

object - the object that needs to be wrapped

Returns:

the model representation of the object

See Also:

IDataProvider.model(Object)

detach

public void detach()

Description copied from interface: IDetachable

Detaches model after use. This is generally used to null out transient references that can be re-attached later.

Specified by:

detach in interface IDetachable

See Also:

IDetachable.detach()