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Jakarta Server 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.view.facelets;

import javax.faces.FacesWrapper;

/**
 * Allows customization of the
 * implementation of {@link FaceletCache}.
 *
 * Usage: extend this class and push the implementation being wrapped to the
 * constructor and use {@link #getWrapped} to access the instance being wrapped.
 *
 * @since 2.1
 */
public abstract class FaceletCacheFactory implements FacesWrapper {

    private FaceletCacheFactory wrapped;

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

    }

    /**
     * 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 FaceletCacheFactory(FaceletCacheFactory 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 FaceletCacheFactory getWrapped() {
        return wrapped;
    }

    public abstract FaceletCache getFaceletCache();


}