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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.FacesException;
import javax.faces.FacesWrapper;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseListener;

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

 * 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 LifecycleWrapper extends Lifecycle implements FacesWrapper {

    private Lifecycle wrapped;

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

    }

    /**
     * If this lifecycle 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 LifecycleWrapper(Lifecycle wrapped) {
        this.wrapped = wrapped;
    }

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

    @Override
    public void addPhaseListener(PhaseListener listener) {
        getWrapped().addPhaseListener(listener);
    }

    @Override
    public void execute(FacesContext context) throws FacesException {
        getWrapped().execute(context);
    }

    @Override
    public PhaseListener[] getPhaseListeners() {
        return getWrapped().getPhaseListeners();
    }

    @Override
    public void removePhaseListener(PhaseListener listener) {
        getWrapped().removePhaseListener(listener);
    }

    @Override
    public void render(FacesContext context) throws FacesException {
        getWrapped().render(context);
    }

    @Override
    public void attachWindow(FacesContext context) {
        getWrapped().attachWindow(context);
    }
}