DataGenerator (vaadin-server 8.27.2 API)

Type Parameters:

T - the data type

All Superinterfaces:

Serializable

All Known Implementing Classes:

AbstractListing.AbstractListingExtension, AbstractSelectionModel, DataCommunicator.ActiveDataHandler, EditorImpl, Grid.AbstractGridExtension, Grid.DetailsManager, HierarchyMapper, MultiSelectionModelImpl, SingleSelectionModelImpl, Tree.TreeMultiSelectionModel, Tree.TreeRenderer

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 interface DataGenerator<T>
extends Serializable
```
A data generator for DataCommunicator. Used to inject custom data to data items sent to the client for extension purposes.

Since:

8.0

Author:

Vaadin Ltd.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default void`	`destroyAllData()`	Informs the `DataGenerator` that all data has been dropped.
`default 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.
`default void`	`refreshData(T item)`	Informs the `DataGenerator` that a data object has been updated.

- Method Detail
  - generateData
```
void generateData(T item,
                  elemental.json.JsonObject jsonObject)
```
    Adds custom data for the given item to its serialized JsonObject representation. This JSON object will be sent to client-side DataProvider.
    
    Parameters:
    
    item - the data item being serialized
    
    jsonObject - the JSON object being sent to the client
  - destroyData
```
default void destroyData(T item)
```
    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.
    
    Parameters:
    
    item - the dropped data item
  - destroyAllData
```
default void destroyAllData()
```
    Informs the DataGenerator that all data has been dropped. This method should clean up any unneeded information stored for items.
  - refreshData
```
default void refreshData(T item)
```
    Informs the DataGenerator that a data object has been updated. This method should update any unneeded information stored for given item.
    
    Parameters:
    
    item - the updated item