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/*
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 *
 * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.java.net/public/CDDL+GPL_1_1.html
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package javax.faces.application;

import javax.faces.FacesWrapper;
import javax.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);
    }

}