javax.faces.application.NavigationHandler Maven / Gradle / Ivy
/*
* $Id: NavigationHandler.java,v 1.15 2007/04/27 22:00:02 ofung Exp $
*/
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package javax.faces.application;
import javax.faces.context.FacesContext;
/**
* A NavigationHandler is passed the outcome string
* returned by an application action invoked for this application, and will
* use this (along with related state information) to choose the view to
* be displayed next.
*
* A default implementation of NavigationHandler must be
* provided by the JSF implementation, which will be utilized unless
* setNavigationHandler() is called to establish a different one.
* This default instance will compare the view identifier of the current
* view, the specified action binding, and the specified outcome against
* any navigation rules provided in faces-config.xml file(s).
* If a navigation case matches, the current view will be changed by a call
* to FacesContext.setViewRoot(). Note that a null
* outcome value will never match any navigation rule, so it can be used as an
* indicator that the current view should be redisplayed.
*/
public abstract class NavigationHandler {
/**
* Perform navigation processing based on the state information
* in the specified {@link FacesContext}, plus the outcome string
* returned by an executed application action.
*
* @param context The {@link FacesContext} for the current request
* @param fromAction The action binding expression that was evaluated
* to retrieve the specified outcome, or null if the
* outcome was acquired by some other means
* @param outcome The logical outcome returned by a previous invoked
* application action (which may be null)
*
* @throws NullPointerException if context
* is null
*/
public abstract void handleNavigation(FacesContext context,
String fromAction,
String outcome);
}