Package com.vaadin.flow.data.provider

Class CompositeDataGenerator<T>

java.lang.Object

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

Type Parameters:

T - the data type of the underlying DataGenerators

All Implemented Interfaces:

DataGenerator<T>, HasDataGenerators<T>, Serializable

public class CompositeDataGenerator<T>
extends Object
implements DataGenerator<T>, HasDataGenerators<T>

A DataGenerator that aggregates multiple DataGenerators and delegates the data generation to them. It doesn't generate or destroy any data by its own.

It is used by components that need to add and remove DataGenerators dynamically, or that support multiple layers of data generation.

Since:

1.0.

Author:

Vaadin Ltd

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
CompositeDataGenerator()

Method Summary

Modifier and Type	Method	Description
Registration	addDataGenerator(DataGenerator<T> generator)	Adds the given data generator.
void	destroyAllData()	Informs the DataGenerator that all data has been dropped.
void	destroyData(T item)	Informs the DataGenerator that the given data item has been dropped and is no longer needed.
void	generateData(T item, elemental.json.JsonObject jsonObject)	Adds custom data for the given item to its serialized JsonObject representation.
void	refreshData(T item)	Informs the DataGenerator that a data object has been updated.

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeDataGenerator

public CompositeDataGenerator()

Method Detail

generateData

public void generateData(T item,
                         elemental.json.JsonObject jsonObject)

Description copied from interface: DataGenerator

Adds custom data for the given item to its serialized JsonObject representation. This JSON object will be sent to client-side DataProvider.

Specified by:

generateData in interface DataGenerator<T>

Parameters:

item - the data item being serialized

jsonObject - the JSON object being sent to the client

destroyData

public void destroyData(T item)

Description copied from interface: DataGenerator

Informs the DataGenerator that the given data item has been dropped and is no longer needed. This method should clean up any unneeded information stored for this item.

Specified by:

destroyData in interface DataGenerator<T>

Parameters:

item - the dropped data item

destroyAllData

public void destroyAllData()

Description copied from interface: DataGenerator

Informs the DataGenerator that all data has been dropped. This method should clean up any unneeded information stored for items.

Specified by:

destroyAllData in interface DataGenerator<T>

refreshData

public void refreshData(T item)

Description copied from interface: DataGenerator

Informs the DataGenerator that a data object has been updated. This method should update any unneeded information stored for given item.

Specified by:

refreshData in interface DataGenerator<T>

Parameters:

item - the updated item

addDataGenerator

public Registration addDataGenerator(DataGenerator<T> generator)

Description copied from interface: HasDataGenerators

Adds the given data generator. If the generator was already added, does nothing.

Specified by:

addDataGenerator in interface HasDataGenerators<T>

Parameters:

generator - the data generator to add

Returns:

a registration that can be used to remove the data generator