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JSR-000372: JavaServer(TM) Faces 2.3 API

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/*
 * Copyright (c) 2011, 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.flow;

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

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

    private FlowHandlerFactory wrapped;

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

    }

    /**
     * If this flow handler 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.
     * @since 2.3
     */
    public FlowHandlerFactoryWrapper(FlowHandlerFactory wrapped) {
        this.wrapped = wrapped;
    }

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

    @Override
    public FlowHandler createFlowHandler(FacesContext context) {
        return getWrapped().createFlowHandler(context);
    }

}