com.holonplatform.vaadin.data

Interface ItemIdentifierProvider<ITEM,ID>

Type Parameters:

ITEM - Item type

ID - Item id type

All Superinterfaces:

Serializable

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ItemIdentifierProvider<ITEM,ID>
extends Serializable

Provider to obtain the identifier of an item.

Since:

5.0.0

Method Summary

Modifier and Type	Method and Description
ID	getItemId(ITEM item) Get the item identifier.
static <T> ItemIdentifierProvider<T,T>	identity() Returns an ItemIdentifierProvider which returns the item itself as item identifier.

Method Detail

getItemId

ID getItemId(ITEM item)

Get the item identifier.

Parameters:

item - Item for which to obtain the identifier (not null)

Returns:

The item identifier, which must not be null. Object.equals(Object) and Object.hashCode() methods are used to compare item identifiers, so the returned identifier should implement such methods in a consistent manner

identity

static <T> ItemIdentifierProvider<T,T> identity()

Returns an ItemIdentifierProvider which returns the item itself as item identifier.

Type Parameters:

T - Item type

Returns:

Identity ItemIdentifierProvider