Package com.vaadin.flow.component.grid.dataview

Class GridListDataView<T>

java.lang.Object

com.vaadin.flow.data.provider.AbstractDataView<T>

com.vaadin.flow.data.provider.AbstractListDataView<T>

com.vaadin.flow.component.grid.dataview.GridListDataView<T>

Type Parameters:

T - data type

All Implemented Interfaces:

DataView<T>, ListDataView<T,AbstractListDataView<T>>, Serializable

public class GridListDataView<T>
extends AbstractListDataView<T>

Data view implementation for Grid with in-memory list data. Provides information on the data and allows operations on it.

Since:

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.vaadin.flow.data.provider.AbstractDataView

component, dataProviderSupplier, NULL_IDENTIFIER_ERROR_MESSAGE

Constructor Summary

Constructors

Constructor	Description
GridListDataView(DataCommunicator<T> dataCommunicator, Grid<T> grid, SerializableBiConsumer<SerializablePredicate<T>,SerializableComparator<T>> filterOrSortingChangedCallback)	Creates a new instance of Grid in-memory data view and verifies the passed data provider is compatible with this data view implementation.

Method Summary

Modifier and Type	Method	Description
int	getItemCount()	Get the full item count with filters if any set.
Stream<T>	getItems()	Get the full data available to the component.
void	setIdentifierProvider(IdentifierProvider<T> identifierProvider)	Sets an identifier provider, which returns an identifier for the given item.

Methods inherited from class com.vaadin.flow.data.provider.AbstractListDataView

addFilter, addItem, addItemAfter, addItemBefore, addItems, addItemsAfter, addItemsBefore, addSortComparator, addSortOrder, contains, getDataProvider, getItem, getNextItem, getPreviousItem, getSupportedDataProviderType, removeFilters, removeItem, removeItems, removeSorting, setFilter, setSortComparator, setSortOrder, validateItemIndex

Methods inherited from class com.vaadin.flow.data.provider.AbstractDataView

addIdentifierProviderChangeListener, addItemCountChangeListener, equals, getIdentifierProvider, refreshAll, refreshItem, verifyDataProviderType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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

addItemCountChangeListener, refreshAll, refreshItem

Constructor Details

GridListDataView

public GridListDataView(DataCommunicator<T> dataCommunicator,
 Grid<T> grid,
 SerializableBiConsumer<SerializablePredicate<T>,SerializableComparator<T>> filterOrSortingChangedCallback)

Creates a new instance of Grid in-memory data view and verifies the passed data provider is compatible with this data view implementation.

Parameters:

dataCommunicator - the data communicator of the Grid, not null

grid - the Grid component, not null

filterOrSortingChangedCallback - callback, which is being invoked when the Grid's filtering or sorting changes, not null

Method Details

getItems

public Stream<T> getItems()

Description copied from interface: DataView

Get the full data available to the component. Data is filtered and sorted the same way as in the component.

Consumers of the returned stream are responsible for closing it when all the stream operations are done to ensure that any resources feeding the stream are properly released. Failure to close the stream might lead to resource leaks.

It is strongly recommended to use a try-with-resources block to automatically close the stream after its terminal operation has been executed. Below is an example of how to properly use and close the stream:

 try (Stream<T> stream = dataView.getItems()) {
     stream.forEach(System.out::println); // Example terminal operation
 }
 

Specified by:

getItems in interface DataView<T>

Overrides:

getItems in class AbstractListDataView<T>

Returns:

filtered and sorted data set

getItemCount

public int getItemCount()

Description copied from interface: ListDataView

Get the full item count with filters if any set. As the item count might change at any point, it is recommended to add a listener with the DataView.addItemCountChangeListener(ComponentEventListener) method instead to get notified when the item count has changed.

Specified by:

getItemCount in interface ListDataView<T,AbstractListDataView<T>>

Overrides:

getItemCount in class AbstractListDataView<T>

Returns:

filtered item count

See Also:

• DataView.addItemCountChangeListener(ComponentEventListener)

setIdentifierProvider

public void setIdentifierProvider(IdentifierProvider<T> identifierProvider)

Description copied from interface: DataView

Sets an identifier provider, which returns an identifier for the given item. The identifier is used for comparing the equality of items. Usage example: dataView.setIdentifiedProvider(Item::getId);.

Specified by:

setIdentifierProvider in interface DataView<T>

Overrides:

setIdentifierProvider in class AbstractDataView<T>

Parameters:

identifierProvider - function that returns the non-null identifier for a given item