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package javax.faces.event;
import java.util.
EventObject;
import javax.faces.component.
UIComponent;
import javax.faces.component.
UIViewRoot;
/**
* <p><strong>FacesEvent</strong> 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.</p>
*/
public abstract class
FacesEvent extends
EventObject {
// ------------------------------------------------------------ Constructors
/**
* <p>Construct a new event object from the specified source component.</p>
*
* @param component Source {@link UIComponent} for this event
*
* @throws IllegalArgumentException if <code>component</code> is
* <code>null</code>
*/
public
FacesEvent(
UIComponent component) {
super(
component);
}
// -------------------------------------------------------------- Properties
/**
* <p>Return the source {@link UIComponent} that sent this event.
*/
public
UIComponent getComponent() {
return ((
UIComponent)
getSource());
}
private
PhaseId phaseId =
PhaseId.
ANY_PHASE;
/**
* <p>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 <code>PhaseId.ANY_PHASE</code>, which is the default
* value.</p>
*/
public
PhaseId getPhaseId() {
return
phaseId;
}
/**
* <p>Set the {@link PhaseId} during which this event will be
* delivered.</p>
*
* @throws IllegalArgumentException phaseId is null.
*
*/
public void
setPhaseId(
PhaseId phaseId) {
if (null ==
phaseId) {
throw new
IllegalArgumentException();
}
this.
phaseId =
phaseId;
}
// ------------------------------------------------- Event Broadcast Methods
/**
* <p>Convenience method to queue this event for broadcast at the end
* of the current request processing lifecycle phase.</p>
*
* @throws IllegalStateException if the source component for this
* event is not a descendant of a {@link UIViewRoot}
*/
public void
queue() {
getComponent().
queueEvent(this);
}
/**
* <p>Return <code>true</code> 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.</p>
*
* @param listener {@link FacesListener} to evaluate
*/
public abstract boolean
isAppropriateListener(
FacesListener listener);
/**
* <p>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.</p>
*
* @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);
}