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Jakarta Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.

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/*
 * 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.UIViewRoot;
import jakarta.faces.context.FacesContext;

/**
 *
 * 
 * When an instance of this event is passed to {@link SystemEventListener#processEvent} or
 * {@link ComponentSystemEventListener#processEvent}, the listener implementation may assume that the
 * source of this event instance is the {@link UIViewRoot} instance that is about to be rendered.
 * 
 *
 * 
 *
 * 
 * It is valid for a listener for this event to change the {@link UIViewRoot} in the current
 * {@link jakarta.faces.context.FacesContext}, but the listener must ensure that the new UIViewRoot was
 * created with a call to {@link jakarta.faces.application.ViewHandler#createView}, and that the view is fully populated
 * with the children to be traversed during render. The listener implementation may call
 * {@link jakarta.faces.view.ViewDeclarationLanguage#buildView} to populate the UIViewRoot.
 * 
 *
 * 
 *
 * @since 2.0
 */
public class PreRenderViewEvent extends ComponentSystemEvent {

    // ------------------------------------------------------------ Constructors

    private static final long serialVersionUID = -781238104491250220L;

    /**
     *
     * 
     * Instantiate a new PreRenderViewEvent that indicates the argument root is about to be
     * rendered.
     * 
     *
     * @param root the UIViewRoot that is about to be rendered.
     *
     * @throws IllegalArgumentException if the argument is null.
     */
    public PreRenderViewEvent(UIViewRoot root) {
        super(root);
    }

    /**
     * 
     * Instantiate a new PreRenderViewEvent that indicates the argument root is about to be
     * rendered.
     * 
     *
     * @param facesContext the Faces context.
     * @param root the UIViewRoot that is about to be rendered.
     * @throws IllegalArgumentException if the argument is null.
     */
    public PreRenderViewEvent(FacesContext facesContext, UIViewRoot root) {
        super(facesContext, root);
    }
}