com.vaadin.flow.component

Class ComponentEventBusUtil

java.lang.Object

com.vaadin.flow.component.ComponentEventBusUtil

public class ComponentEventBusUtil
extends Object

Static helpers and caching functionality for ComponentEventBus.

Since:

1.0

Author:

Vaadin Ltd

Method Summary

Modifier and Type	Method and Description
static <T extends ComponentEvent<?>> Constructor<T>	getEventConstructor(Class<T> eventType) Gets the constructor to use for firing a component event, of the given type, based on a DOM event.
static LinkedHashMap<String,Class<?>>	getEventDataExpressions(Class<? extends ComponentEvent<?>> eventType) Gets a map of event data expression (for Element.addEventListener(String, com.vaadin.flow.dom.DomEventListener, String...) ) to Java type, with the same order as the parameters for the event constructor (as returned by getEventConstructor(Class)).
static boolean	isDomEventConstructor(Constructor<?> constructor) Checks if the given constructor can be used when firing a ComponentEvent based on a DomEvent.

Methods inherited from class java.lang.Object

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

Method Detail

getEventDataExpressions

public static LinkedHashMap<String,Class<?>> getEventDataExpressions(Class<? extends ComponentEvent<?>> eventType)

Gets a map of event data expression (for Element.addEventListener(String, com.vaadin.flow.dom.DomEventListener, String...) ) to Java type, with the same order as the parameters for the event constructor (as returned by getEventConstructor(Class)).

Caches values and automatically uses the cached values when available.

Parameters:

eventType - the component event type

Returns:

a map of event expressions, ordered in constructor parameter order

getEventConstructor

public static <T extends ComponentEvent<?>> Constructor<T> getEventConstructor(Class<T> eventType)

Gets the constructor to use for firing a component event, of the given type, based on a DOM event.

Type Parameters:

T - the event type

Parameters:

eventType - the event type

Returns:

the constructor to use when creating an event from a DOM event

Throws:

IllegalArgumentException - if no suitable constructor was found

isDomEventConstructor

public static boolean isDomEventConstructor(Constructor<?> constructor)

Checks if the given constructor can be used when firing a ComponentEvent based on a DomEvent.

Parameters:

constructor - the constructor to check

Returns:

true if the constructor can be used, false otherwise