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This artifact originates from the Orbit Project at Eclipse, it is an osgi bundle and is signed as well.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jasper.runtime;

import java.io.IOException;
import java.io.FileInputStream;
import java.io.InputStreamReader;

import java.net.URL;
import java.net.MalformedURLException;
import java.util.List;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;

import org.apache.jasper.JasperException;
import org.apache.jasper.compiler.Localizer;

/**
 * This is the super class of all JSP-generated servlets.
 *
 * @author Anil K. Vijendran
 */
public abstract class HttpJspBase 
    extends HttpServlet 
    implements HttpJspPage 
{
    protected HttpJspBase() {
    }

    public final void init(ServletConfig config) 
	throws ServletException 
    {
        super.init(config);
	jspInit();
        _jspInit();
    }
    
    public String getServletInfo() {
	return Localizer.getMessage("jsp.engine.info");
    }

    public final void destroy() {
	jspDestroy();
	_jspDestroy();
    }

    /**
     * Entry point into service.
     */
    public final void service(HttpServletRequest request, HttpServletResponse response) 
	throws ServletException, IOException 
    {
        _jspService(request, response);
    }
    
    public void jspInit() {
    }

    public void _jspInit() {
    }

    public void jspDestroy() {
    }

    protected void _jspDestroy() {
    }

    public abstract void _jspService(HttpServletRequest request, 
				     HttpServletResponse response) 
	throws ServletException, IOException;
}