jakarta.faces.event.ComponentSystemEvent Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.event;
import jakarta.faces.component.UIComponent;
import jakarta.faces.context.FacesContext;
/**
*
*
* ComponentSystemEvent is the base class for
* {@link SystemEvent}s that are specific to a {@link UIComponent} instance.
*
*
* @since 2.0
*/
public abstract class ComponentSystemEvent extends SystemEvent {
private static final long serialVersionUID = -4726746661822507506L;
// ------------------------------------------------------------ Constructors
/**
*
* Pass the argument component to the superclass constructor.
*
*
* @param component the UIComponent reference to be passed to the superclass constructor.
*
* @throws IllegalArgumentException if the argument is null.
*
* @since 2.0
*/
public ComponentSystemEvent(UIComponent component) {
super(component);
}
/**
*
* Pass the argument component to the superclass constructor.
*
*
* @param facesContext the Faces context.
* @param component the UIComponent reference to be passed to the superclass constructor.
*
* @throws IllegalArgumentException if the argument is null.
*
* @since 2.0
*/
public ComponentSystemEvent(FacesContext facesContext, UIComponent component) {
super(facesContext, component);
}
/**
*
* Return true if the argument {@link FacesListener} is an instance of the appropriate listener class that
* this event supports. The default implementation returns true if the listener is a
* {@link ComponentSystemEventListener} or if super.isAppropriateListener() returns true.
*
*
* @param listener {@link FacesListener} to evaluate
* @since 2.2
*/
@Override
public boolean isAppropriateListener(FacesListener listener) {
boolean result = listener instanceof ComponentSystemEventListener;
if (!result) {
result = super.isAppropriateListener(listener);
}
return result;
}
/**
*
* Broadcast this event instance to the specified {@link FacesListener} by calling the superclass's
* processListener() implementation.
*
*
* @param listener {@link FacesListener} to evaluate
* @since 2.2
*/
@Override
public void processListener(FacesListener listener) {
UIComponent c = getComponent();
UIComponent cFromStack;
boolean didPush = false;
FacesContext context = FacesContext.getCurrentInstance();
cFromStack = UIComponent.getCurrentComponent(context);
if (null == cFromStack) {
didPush = true;
c.pushComponentToEL(context, null);
}
try {
if (listener instanceof SystemEventListener) {
super.processListener(listener);
} else if (listener instanceof ComponentSystemEventListener) {
((ComponentSystemEventListener) listener).processEvent(this);
}
} finally {
if (didPush) {
c.popComponentFromEL(context);
}
}
}
// -------------------------------------------------------------- Properties
/**
*
* the source {@link UIComponent} that sent this event.
*
*
* @since 2.0
*
* @return the component for this event
*/
public UIComponent getComponent() {
return (UIComponent) getSource();
}
}