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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.application;

import jakarta.faces.FacesWrapper;
import jakarta.faces.context.FacesContext;

/**
 * 
 * NavigationHandlerWrapper provides a simple implementation of
 * {@link NavigationHandler} that can be subclassed by developers wishing to provide specialized behavior to an existing
 * {@link NavigationHandler} instance. The default implementation of all methods is to call through to the wrapped
 * {@link NavigationHandler} instance.
 * 
 *
 * 
 * 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 NavigationHandlerWrapper extends NavigationHandler implements FacesWrapper {

    private NavigationHandler wrapped;

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

    }

    /**
     * 
     * If this navigation handler 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.
     * @since 2.3
     */
    public NavigationHandlerWrapper(NavigationHandler wrapped) {
        this.wrapped = wrapped;
    }

    @Override
    public NavigationHandler getWrapped() {
        return wrapped;
    }

    @Override
    public void handleNavigation(FacesContext context, String fromAction, String outcome) {
        getWrapped().handleNavigation(context, fromAction, outcome);
    }

    @Override
    public void handleNavigation(FacesContext context, String fromAction, String outcome, String toFlowDocumentId) {
        getWrapped().handleNavigation(context, fromAction, outcome, toFlowDocumentId);
    }

}