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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, 2018 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 javax.faces.lifecycle;

import javax.faces.FacesWrapper;
import javax.faces.context.FacesContext;

/**
 * Create {@link ClientWindow} instances based on 
 * the incoming request.
 * 
 * Usage: extend this class and push the implementation being wrapped to the
 * constructor and use {@link #getWrapped} to access the instance being wrapped.
 * 
 * @since 2.2
 */
public abstract class ClientWindowFactory implements FacesWrapper {

    
    private ClientWindowFactory wrapped;

    /**
     * @deprecated Use the other constructor taking the implementation being wrapped.
     */
    @Deprecated
    public ClientWindowFactory() {
        
    }

    /**
     * If this factory has been decorated, 
     * the implementation doing the decorating should push the implementation being wrapped to this constructor.
     * The {@link #getWrapped()} will then return the implementation being wrapped.
     * 
     * @param wrapped The implementation being wrapped.
     */
    public ClientWindowFactory(ClientWindowFactory wrapped) {
        this.wrapped = wrapped;
    }

    /**
     * If this factory has been decorated, the 
     * implementation doing the decorating may override this method to provide
     * access to the implementation being wrapped.
     */
    @Override
    public ClientWindowFactory getWrapped() {
        return wrapped;
    }

    /**
     * The implementation is responsible
     * for creating the {@link ClientWindow} instance for this request.
     * If {@link ClientWindow#CLIENT_WINDOW_MODE_PARAM_NAME}
     * is "none" or unspecified, this method must return {@code null}.  
     * If {@link ClientWindow#CLIENT_WINDOW_MODE_PARAM_NAME}
     * is "url" the implementation must return a ClientWindow
     * instance that implements the url-mode semantics described in
     * {@link ClientWindow}.
     * 
     * @param context the {@link FacesContext} for this request.
     * @return the {@link ClientWindow} for this request, or {@code null} 
     * 
     * @since 2.2
     */
    
    public abstract ClientWindow getClientWindow(FacesContext context);
    
}