NavigationHandler (Vaadin Platform (vaadin-platform-javadoc) 23.3.19 API)

All Superinterfaces:

Serializable

All Known Implementing Classes:

AbstractNavigationStateRenderer, ErrorStateRenderer, InternalRedirectHandler, NavigationStateRenderer

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 NavigationHandler
extends Serializable
```
Handles navigation to a location e.g. by showing a navigation target component in a UI or by redirecting the user to another location.
Subclasses using external data should take care to avoid synchronization issues since the same navigation handler instances may be used concurrently from multiple threads. Data provided in the navigation event should be safe to use without synchronization since the associated VaadinSession and everything related to it will be locked.

Since:

1.0

Author:

Vaadin Ltd

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  int handle(NavigationEvent event)
  Handles the navigation event.

- Method Detail
  - handle
```
int handle(NavigationEvent event)
```
    Handles the navigation event.
    
    Parameters:
    
    event - the navigation event to handle
    
    Returns:
    
    the HTTP status code to return to the client if handling an initial rendering request