com.vaadin.flow.data.provider

Interface BackEndDataProvider<T,F>

Type Parameters:

T - data provider data type

F - data provider filter type

All Superinterfaces:

DataProvider<T,F>, Serializable

All Known Subinterfaces:

BackEndHierarchicalDataProvider<T,F>

All Known Implementing Classes:

AbstractBackEndDataProvider, AbstractBackEndHierarchicalDataProvider, CallbackDataProvider

public interface BackEndDataProvider<T,F>
extends DataProvider<T,F>

A data provider that lazy loads items from a back end.

Since:

1.0

Method Summary

Modifier and Type	Method and Description
default boolean	isInMemory() Gets whether the DataProvider content all available in memory or does it use some external backend.
default void	setSortOrder(QuerySortOrder sortOrder) Sets a single sort order to use as the default sorting for this data provider.
void	setSortOrders(List<QuerySortOrder> sortOrders) Sets a list of sort orders to use as the default sorting for this data provider.
default void	setSortOrders(QuerySortOrderBuilder builder) Sets the sort order to use, given a QuerySortOrderBuilder.

Methods inherited from interface com.vaadin.flow.data.provider.DataProvider

addDataProviderListener, fetch, fromCallbacks, fromFilteringCallbacks, fromStream, getId, ofCollection, ofItems, refreshAll, refreshItem, refreshItem, size, withConfigurableFilter, withConfigurableFilter, withConvertedFilter

Method Detail

setSortOrders

void setSortOrders(List<QuerySortOrder> sortOrders)

Sets a list of sort orders to use as the default sorting for this data provider. This overrides the sorting set by any other method that manipulates the default sorting of this data provider.

The default sorting is used if the query defines no sorting. The default sorting is also used to determine the ordering of items that are considered equal by the sorting defined in the query.

Parameters:

sortOrders - a list of sort orders to set, not null

See Also:

setSortOrder(QuerySortOrder)

setSortOrders

default void setSortOrders(QuerySortOrderBuilder builder)

Sets the sort order to use, given a QuerySortOrderBuilder. Shorthand for setSortOrders(builder.build()).

Parameters:

builder - the sort builder to retrieve the sort order from

Throws:

NullPointerException - if builder is null

See Also:

QuerySortOrderBuilder

setSortOrder

default void setSortOrder(QuerySortOrder sortOrder)

Sets a single sort order to use as the default sorting for this data provider. This overrides the sorting set by any other method that manipulates the default sorting of this data provider.

The default sorting is used if the query defines no sorting. The default sorting is also used to determine the ordering of items that are considered equal by the sorting defined in the query.

Parameters:

sortOrder - a sort order to set, or null to clear any previously set sort orders

See Also:

setSortOrders(List)

isInMemory

default boolean isInMemory()

Description copied from interface: DataProvider

Gets whether the DataProvider content all available in memory or does it use some external backend.

Specified by:

isInMemory in interface DataProvider<T,F>

Returns:

true if all data is in memory; false if not