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package javax.faces.event;
import java.util.EventObject;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewAction;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
/**
* FacesEvent is the base class
* for user interface and application events that can be fired by {@link UIComponent}s.
* Concrete event classes must subclass {@link FacesEvent} in order to be supported
* by the request processing lifecycle.
*/
public abstract class FacesEvent extends EventObject {
private static final long serialVersionUID = -367663885586773794L;
/**
* Stores the Faces context.
*/
private transient FacesContext facesContext;
/**
* Construct a new event object from the
* specified source component.
*
* @param component Source {@link UIComponent} for this event
* @throws IllegalArgumentException if component is null
*/
public FacesEvent(UIComponent component) {
super(component);
}
/**
* Construct a new event object from the
* Faces context and specified source component.
*
* @param facesContext the Faces context.
* @param component Source {@link UIComponent} for this event.
* @throws IllegalArgumentException if component is null
* @since 2.3
*/
public FacesEvent(FacesContext facesContext, UIComponent component) {
this(component);
this.facesContext = facesContext;
}
// -------------------------------------------------------------- Properties
/**
* Return the source {@link UIComponent} that sent this event.
*
* @return the source UI component.
*/
public UIComponent getComponent() {
return ((UIComponent) getSource());
}
/**
*
Get the Faces context.
*
*
* If the constructor was passed a FacesContext we return it, otherwise
* we call FacesContext.getCurrentInstance() and return it.
*
*
* @return the Faces context.
* @since 2.3
*/
public FacesContext getFacesContext() {
/*
* Note because UIViewAction is decorating the FacesContext during
* the execution of a request we cannot rely on the saved FacesContext
* as it would be the original FacesContext (which is what we should be
* able to rely on).
*
* TODO - remove UIViewAction dependency on decorating the FacesContext.
*/
if (!(source instanceof UIViewAction) && facesContext != null) {
return facesContext;
}
return FacesContext.getCurrentInstance();
}
private PhaseId phaseId = PhaseId.ANY_PHASE;
/**
* Return the identifier of the request processing phase during
* which this event should be delivered. Legal values are the
* singleton instances defined by the {@link PhaseId} class,
* including PhaseId.ANY_PHASE, which is the default
* value.
*
* @return the phase id.
*/
public PhaseId getPhaseId() {
return phaseId;
}
/**
* Set the {@link PhaseId} during which this event will be
* delivered.
*
* @param phaseId the phase id.
* @throws IllegalArgumentException phaseId is null.
*/
public void setPhaseId(PhaseId phaseId) {
if (null == phaseId) {
throw new IllegalArgumentException();
}
this.phaseId = phaseId;
}
// ------------------------------------------------- Event Broadcast Methods
/**
* Convenience method to queue this event for broadcast at the end
* of the current request processing lifecycle phase.
*
* @throws IllegalStateException if the source component for this
* event is not a descendant of a {@link UIViewRoot}
*/
public void queue() {
getComponent().queueEvent(this);
}
/**
* Return true if this {@link FacesListener} is an instance
* of a listener class that this event supports. Typically, this will be
* accomplished by an "instanceof" check on the listener class.
*
* @param listener {@link FacesListener} to evaluate
* @return true if it is the appropriate instance, false otherwise.
*/
public abstract boolean isAppropriateListener(FacesListener listener);
/**
* Broadcast this {@link FacesEvent} to the specified
* {@link FacesListener}, by whatever mechanism is appropriate. Typically,
* this will be accomplished by calling an event processing method, and
* passing this {@link FacesEvent} as a paramter.
*
* @param listener {@link FacesListener} to send this {@link FacesEvent} to
*
* @throws AbortProcessingException Signal the JavaServer Faces
* implementation that no further processing on the current event
* should be performed
*/
public abstract void processListener(FacesListener listener);
}