pagecontextimpl.java

低版本的tomcat 对于有些老版本的应用还真的需要老版的中间件

/*
 * $Header: /home/cvs/jakarta-tomcat/src/share/org/apache/jasper/runtime/PageContextImpl.java,v 1.13.2.4 2001/09/01 00:40:03 costin Exp $
 * $Revision: 1.13.2.4 $
 * $Date: 2001/09/01 00:40:03 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.jasper.runtime;

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

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.NoSuchElementException;
import java.util.Stack;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletException;

import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyContent;

import org.apache.jasper.Constants;


/**
 * Implementation of the PageContext class from the JSP spec.
 *
 * @author Anil K. Vijendran
 * @author Larry Cable
 * @author Hans Bergsten
 */
public class PageContextImpl extends PageContext {
    PageContextImpl(JspFactory factory) {
        this.factory = factory;
    }

    /*
      static class InitAction implements java.security.PrivilegedAction {
	Servlet servlet;
	ServletRequest request;
	ServletResponse response;
	String errorPageURL;
	boolean needsSession;
	int bufferSize;
	boolean autoFlush;
	PageContextImpl pci;
	    
	InitAction(PageContextImpl pci, Servlet s, ServletRequest req,
		   ServletResponse res, String err,
		   boolean n, int b,
		   boolean a) {
	    this.pci=pci;
	    servlet=s;
	    request=req;
	    response=res;
	    errorPageURL=err;
	    needsSession=n;;
	    bufferSize=b;
	    autoFlush=a;
	}
	
	public Object run()  {
	    try {
		pci._initialize(servlet, request, response, errorPageURL, needsSession, bufferSize, autoFlush);
	    } catch( Throwable t ) {
		t.printStackTrace();
	    }
	    return null;
	}
    }
    */    
    public void initialize(Servlet servlet, ServletRequest request,
                           ServletResponse response, String errorPageURL,
                           boolean needsSession, int bufferSize,
                           boolean autoFlush)
        throws IOException, IllegalStateException, IllegalArgumentException
    {
	// 	 	InitAction ia=new InitAction( this, servlet, request, response,
	// 	 					  errorPageURL, needsSession, bufferSize,
	// 	 					  autoFlush);
	// 		java.security.AccessController.doPrivileged( ia );
	_initialize(servlet, request, response, errorPageURL, needsSession, bufferSize, autoFlush);
    }

    void _initialize(Servlet servlet, ServletRequest request,
                           ServletResponse response, String errorPageURL,
                           boolean needsSession, int bufferSize,
                           boolean autoFlush)
        throws IOException, IllegalStateException, IllegalArgumentException
    {

	// initialize state

	this.servlet      = servlet;
	this.config	  = servlet.getServletConfig();
	this.context	  = config.getServletContext();
	this.needsSession = needsSession;
	this.errorPageURL = errorPageURL;
	this.bufferSize   = bufferSize;
	this.autoFlush    = autoFlush;
	this.request      = request;
	this.response     = response;

	// setup session (if required)
	if (request instanceof HttpServletRequest && needsSession)
	    this.session = ((HttpServletRequest)request).getSession();

	if (needsSession && session == null)
	    throw new IllegalStateException("Page needs a session and none is available");

	// initialize the initial out ...
	//	System.out.println("Initialize PageContextImpl " + out );
	if( out == null ) {
	    out = _createOut(bufferSize, autoFlush); // throws
	} else
	    ((JspWriterImpl)out).init(response, bufferSize, autoFlush );
	
	if (this.out == null)
	    throw new IllegalStateException("failed initialize JspWriter");

	// register names/values as per spec

	setAttribute(OUT,         this.out);
	setAttribute(REQUEST,     request);
	setAttribute(RESPONSE,    response);

	if (session != null)
	    setAttribute(SESSION, session);

	setAttribute(PAGE,        servlet);
	setAttribute(CONFIG,      config);
	setAttribute(PAGECONTEXT, this);
	setAttribute(APPLICATION,  context);
    }

    public void release() {
	servlet      = null;
	config	     = null;
	context	     = null;
	needsSession = false;
	errorPageURL = null;
	bufferSize   = JspWriter.DEFAULT_BUFFER;
	autoFlush    = true;
	request      = null;
	response     = null;
	// Reuse // XXX problems - need to fix them first!!
	out	     = null; // out is closed elsewhere
	if( out instanceof JspWriterImpl )
	    ((JspWriterImpl)out).recycle();
	session      = null;

	attributes.clear();
    }

    public Object getAttribute(String name) {
	return attributes.get(name);
    }


    public Object getAttribute(String name, int scope) {
	switch (scope) {
	    case PAGE_SCOPE:
		return attributes.get(name);

	    case REQUEST_SCOPE:
		return request.getAttribute(name);

	    case SESSION_SCOPE:
		if (session == null)
		    throw new IllegalArgumentException("can't access SESSION_SCOPE without an HttpSession");
		else
		    return session.getAttribute(name);

	    case APPLICATION_SCOPE:
		return context.getAttribute(name);

	    default:
		throw new IllegalArgumentException("unidentified scope");
	}
    }


    public void setAttribute(String name, Object attribute) {
	attributes.put(name, attribute);
    }


    public void setAttribute(String name, Object o, int scope) {
	switch (scope) {