Package com.vaadin.data.util

Interface ItemSorter

All Superinterfaces:

Cloneable, Comparator<Object>, Serializable

All Known Implementing Classes:

DefaultItemSorter

public interface ItemSorter
extends Comparator<Object>, Cloneable, Serializable

An item comparator which is compatible with the Container.Sortable interface. The ItemSorter interface can be used in Sortable implementations to provide a custom sorting method.

Method Summary

Modifier and Type	Method	Description
int	compare(Object itemId1, Object itemId2)	Compares its two arguments for order.
void	setSortProperties(Container.Sortable container, Object[] propertyId, boolean[] ascending)	Sets the parameters for an upcoming sort operation.

Methods inherited from interface java.util.Comparator

equals

Method Detail

setSortProperties

void setSortProperties(Container.Sortable container,
                       Object[] propertyId,
                       boolean[] ascending)

Sets the parameters for an upcoming sort operation. The parameters determine what container to sort and how the ItemSorter sorts the container.

Parameters:

container - The container that will be sorted. The container must contain the propertyIds given in the propertyId parameter.

propertyId - The property ids used for sorting. The property ids must exist in the container and should only be used if they are also sortable, i.e include in the collection returned by container.getSortableContainerPropertyIds(). See Container.Sortable.sort(Object[], boolean[]) for more information.

ascending - Sorting order flags for each property id. See Container.Sortable.sort(Object[], boolean[]) for more information.

compare

int compare(Object itemId1,
            Object itemId2)

Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

The parameters for the ItemSorter compare() method must always be item ids which exist in the container set using setSortProperties(Sortable, Object[], boolean[]).

Specified by:

compare in interface Comparator<Object>

See Also:

Comparator.compare(Object, Object)