org.apache.struts2.jasper.runtime.HttpJspBase.java Source code

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Here is the source code for org.apache.struts2.jasper.runtime.HttpJspBase.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.struts2.jasper.runtime;

import org.apache.struts2.jasper.compiler.Localizer;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.HttpJspPage;
import javax.servlet.jsp.JspFactory;
import java.io.IOException;

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

{

    static {
        if (JspFactory.getDefaultFactory() == null) {
            JspFactoryImpl factory = new JspFactoryImpl();
            if (System.getSecurityManager() != null) {
                String basePackage = "org.apache.struts2.jasper.";
                try {
                    factory.getClass().getClassLoader()
                            .loadClass(basePackage + "runtime.JspFactoryImpl$PrivilegedGetPageContext");
                    factory.getClass().getClassLoader()
                            .loadClass(basePackage + "runtime.JspFactoryImpl$PrivilegedReleasePageContext");
                    factory.getClass().getClassLoader().loadClass(basePackage + "runtime.JspRuntimeLibrary");
                    factory.getClass().getClassLoader()
                            .loadClass(basePackage + "runtime.JspRuntimeLibrary$PrivilegedIntrospectHelper");
                    factory.getClass().getClassLoader()
                            .loadClass(basePackage + "runtime.ServletResponseWrapperInclude");
                    factory.getClass().getClassLoader().loadClass(basePackage + "servlet.JspServletWrapper");
                } catch (ClassNotFoundException ex) {
                    org.apache.commons.logging.LogFactory.getLog(HttpJspBase.class)
                            .error("Jasper JspRuntimeContext preload of class failed: " + ex.getMessage(), ex);
                }
            }
            JspFactory.setDefaultFactory(factory);
        }
    }

    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;
}