/*
* Copyright (c) 2007, 2020 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 ee.jakarta.tck.pages.common.servlet;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import jakarta.servlet.GenericServlet;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;

/**
 * GenericTCKServlet.java
*
* Any test that would normally extend GenericServlet will instead extend this
* class. This will provide a simple framework from invoking various tests
* defined as methods within the servlet that extends this class.
*
* Created: Wed Jul 31 20:57:16 2002
*
* @author <a href="mailto:">Ryan Lubke</a>
* @version %I%
*/

public abstract class GenericTCKServlet extends GenericServlet {

    /**
    * <code>TEST_HEADER</code> is the constant for the <code>testname</code>
    * header.
    */
    private static final String TEST_HEADER = "testname";

    /**
    * <code>TEST_ARGS</code> is an array of Classes used during reflection.
    */
    private static final Class<?>[] TEST_ARGS = { ServletRequest.class,
        ServletResponse.class };

    /**
    * <code>init</code> initializes the servlet.
    *
    * @param config
    *          - <code>ServletConfig</code>
    */
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }

    public void service(ServletRequest req, ServletResponse res)
        throws ServletException, IOException {
        invokeTest(req, res);
    }

    /**
    * <code>invokeTest</code> uses reflection to invoke test methods in child
    * classes of this particular class.
    *
    * @param req
    *          - <code>ServletRequest</code>
    * @param res
    *          - <code>ServletResponse</code>
    * @exception ServletException
    *              if an error occurs
    */
    protected void invokeTest(ServletRequest req, ServletResponse res)
        throws ServletException {
        String test = req.getParameter(TEST_HEADER);
        try {
        Method method = this.getClass().getMethod(test, TEST_ARGS);
        method.invoke(this, req, res);
        } catch (InvocationTargetException ite) {
        throw new ServletException(ite.getTargetException());
        } catch (NoSuchMethodException nsme) {
        throw new ServletException("Test: " + test + " does not exist");
        } catch (Throwable t) {
        throw new ServletException("Error executing test: " + test, t);
        }
    }

}// GenericTCKServlet