/*
 * 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
 */

import java.io.*;
import jakarta.servlet.*;

public class Filter_A implements Filter {

    public void init(FilterConfig filterConfig) throws ServletException {
        // do nothing
    }

    public void doFilter (ServletRequest request,
                          ServletResponse response,
                          FilterChain chain)
            throws IOException, ServletException {

        if (request.getAttribute("Filter_B") != null) {
            throw new ServletException("Unexpected request attribute");
        }

        request.setAttribute("Filter_A", "Filter_A");

        chain.doFilter(request, response);
    }

    public void destroy() {
        // do nothing
    }
}