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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 com.sun.faces.application.annotation;

import java.lang.annotation.Annotation;

/**
 * Scanner implementation responsible for link Resource
 * annotations.
 *
 *  Note this will delegate down to the ResourceScanner so we can fail
 * gracefully when JavaEE is not available. 
 */
public class DelegatedResourceScanner implements Scanner {

    private Scanner delegate;

    public DelegatedResourceScanner() {
        try {
            delegate = new ResourceScanner();
        } catch (Throwable throwable) {
            throwable.printStackTrace(System.err);
        }
    }

    /**
     * Delegate to the actual Resource scanner.
     *
     * @return the annotation.
     */
    @Override
    public Class getAnnotation() {
        if (delegate != null) {
            return delegate.getAnnotation();
        }
        return null;
    }

    /**
     * Delegate to the actual EBJ scanner.
     *
     * @param clazz the class.
     * @return the runtime annotation handler.
     */
    @Override
    public RuntimeAnnotationHandler scan(Class clazz) {
        if (delegate != null) {
            return delegate.scan(clazz);
        }
        return null;
    }
}