com.vaadin.flow.data.provider

Interface CallbackDataProvider.CountCallback<T,F>

Type Parameters:

T - the type of the items to count

F - the type of the optional filter in the query, Void if filtering is not supported

All Superinterfaces:

Serializable

Enclosing class:

CallbackDataProvider<T,F>

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 static interface CallbackDataProvider.CountCallback<T,F>
extends Serializable

Callback interface for counting the number of items in a backend based on a query.

Method Summary

Modifier and Type	Method and Description
int	count(Query<T,F> query) Counts the number of available items based on a query.

Method Detail

count

int count(Query<T,F> query)

Counts the number of available items based on a query. The query optionally defines any filtering to use through Query.getFilter(). The query also contains information about paging and sorting although that information is generally not applicable for determining the number of items.

Parameters:

query - the query that defines which items to count

Returns:

the number of available items