Package com.flowingcode.vaadin.jsonmigration

Class LitRendererMigrationExtension

java.lang.Object

com.flowingcode.vaadin.jsonmigration.LitRendererMigrationExtension

public class LitRendererMigrationExtension
extends Object

Provides migration support for LitRenderer event handler registration across Vaadin versions.

In Vaadin 24, LitRenderer.withFunction receives a JsonArray from the elemental.json API directly. In Vaadin 25+, the argument type changed to a Jackson ArrayNode, so this class wraps the handler to perform the necessary conversion transparently.

The LitRenderer type referenced here is resolved at runtime via a method handle, allowing this library to compile against Vaadin 14 while supporting Vaadin 24+.

Note: This class is only useful when running on Vaadin 24 or later. On earlier versions, LitRenderer is not available and any attempt to use this class will fail at runtime.

Constructor Summary

Constructors

Constructor	Description
LitRendererMigrationExtension()

Method Summary

Modifier and Type	Method	Description
static <SOURCE> com.flowingcode.vaadin.jsonmigration.LitRendererMigrationExtension.LitRenderer<SOURCE>	withFunction(com.flowingcode.vaadin.jsonmigration.LitRendererMigrationExtension.LitRenderer<SOURCE> renderer, String name, SerializableBiConsumer<SOURCE,elemental.json.JsonArray> handler)	Registers an event handler function on the given LitRenderer.

Methods inherited from class java.lang.Object

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

Constructor Details

LitRendererMigrationExtension

public LitRendererMigrationExtension()

Method Details

withFunction

public static <SOURCE>
com.flowingcode.vaadin.jsonmigration.LitRendererMigrationExtension.LitRenderer<SOURCE> withFunction(com.flowingcode.vaadin.jsonmigration.LitRendererMigrationExtension.LitRenderer<SOURCE> renderer,
 String name,
 SerializableBiConsumer<SOURCE,elemental.json.JsonArray> handler)

Registers an event handler function on the given LitRenderer.

On Vaadin 25+, the raw argument passed by the client is a Jackson ArrayNode rather than a JsonArray, so the handler is wrapped to convert it before forwarding.

Type Parameters:

SOURCE - the bean type of the renderer

Parameters:

renderer - the LitRenderer on which to register the function

name - the client-side function name

handler - the handler to invoke when the client calls the function; receives the item and a JsonArray of arguments

Returns:

the same renderer instance, for chaining