com.google.gwt.view.client
Interface ProvidesKey<T>

Type Parameters:

T - the data type of records in the list

All Known Subinterfaces:

SelectionModel<T>, SetSelectionModel<T>

All Known Implementing Classes:

AbstractDataProvider, AsyncDataProvider, DefaultSelectionModel, EntityProxyKeyProvider, ListDataProvider, MultiSelectionModel, NoSelectionModel, OrderedMultiSelectionModel, SelectionModel.AbstractSelectionModel, SimpleKeyProvider, SingleSelectionModel

public interface ProvidesKey<T>

Implementors of ProvidesKey provide a key for list items, such that items that are to be treated as distinct (for example, for editing) have distinct keys.

The key must implement a coherent set of Object.equals(Object) and Object.hashCode() methods such that if objects A and B are to be treated as identical, then A.equals(B), B.equals(A), and A.hashCode() == B.hashCode(). If A and B are to be treated as unequal, then it must be the case that A.equals(B) == false and B.equals(A) == false.

getKey

java.lang.Object getKey(T item)

Get the key for a list item.

Parameters:

item - the list item

Returns:

the key that represents the item