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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.
* An implementation
* of this class must be thread-safe.
* 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.
*
* If the implementation class also
* extends {@link ConfigurableNavigationHandler}, the implementation
* must guarantee that the logic used in a call to {@link
* ConfigurableNavigationHandler#getNavigationCase} is used in this
* method to determine the correct navigation.
*
* This method must set the render targets
* (used in partial rendering) to render all
* invoking {@link javax.faces.context.PartialViewContext#setRenderAll})
* if the view identifier has changed as the result of an application
* action (to take into account Ajax requests).
*
* @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);
/**
* Overloaded variant of {@link #handleNavigation(javax.faces.context.FacesContext, java.lang.String, java.lang.String)}
* that allows the caller to provide the defining document id for a flow
* to be entered by this navigation. For backward compatibility with
* decorated {@code NavigationHandler} implementations that conform to an
* earlier version of the specification, an implementation is provided that
* calls through to {@link #handleNavigation(javax.faces.context.FacesContext, java.lang.String, java.lang.String)},
* ignoring the {@code toFlowDocumentId} parameter.
*
* @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)
* @param toFlowDocumentId The defining document id of the flow into which
* this navigation will cause entry.
*
* @throws NullPointerException if context
* is null
*/
public void handleNavigation(FacesContext context,
String fromAction,
String outcome,
String toFlowDocumentId) {
this.handleNavigation(context, fromAction, outcome);
}
}