jspservlet.java

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	// getClass().getClassLoader() returns null in JDK 1.1.6/1.1.8
	if (parentClassLoader != null) {
            Constants.message("jsp.message.parent_class_loader_is", 
                              new Object[] {
                                  parentClassLoader.toString()
                              }, Logger.DEBUG);
            }
	else {
            Constants.message("jsp.message.parent_class_loader_is", 
                              new Object[] {
                                  "<none>"
                              }, Logger.DEBUG);
	}
	//	System.out.println("JspServlet: init " + config.getServletName() );
	if( loader==null ) {
	    if( jdk12 ) {
		try {
		    Class ld=Class.forName("org.apache.jasper.servlet.JasperLoader12");
		    loader=(JasperLoader)ld.newInstance();
		} catch(Throwable t ) {
		    t.printStackTrace();
		}
	    }
	    if( loader==null )
		loader = new org.apache.jasper.servlet.JasperLoader();

	    loader.setParentClassLoader(parentClassLoader);
	    loader.setOptions(options);
	    Object pd=context.getAttribute("org.apache.tomcat.protection_domain");
	    loader.setProtectionDomain( pd );
	}
	if (firstTime) {
	    firstTime = false;
	    Constants.message("jsp.message.scratch.dir.is", 
			      new Object[] { 
				  options.getScratchDir().toString() 
			      }, Logger.INFORMATION );
	    Constants.message("jsp.message.dont.modify.servlets", Logger.INFORMATION);
	    JspFactory.setDefaultFactory(new JspFactoryImpl());
	}
    }

    private void serviceJspFile(HttpServletRequest request, 
      				HttpServletResponse response, String jspUri, 
				Throwable exception, boolean precompile) 
	throws ServletException, IOException
    {
	boolean isErrorPage = exception != null;
	
	JspServletWrapper wrapper = (JspServletWrapper) jsps.get(jspUri);
	if (wrapper == null) {
	    wrapper = new JspServletWrapper(jspUri, isErrorPage);
	    jsps.put(jspUri, wrapper);
	}
	
	wrapper.service(request, response, precompile);
    }


    boolean preCompile(HttpServletRequest request) 
        throws ServletException 
    {
        boolean precompile = false;
        String precom = request.getParameter(Constants.PRECOMPILE);
        String qString = request.getQueryString();
        
        if (precom != null) {
            if (precom.equals("true")) 
                precompile = true;
            else if (precom.equals("false")) 
                precompile = false;
            else {
		    // This is illegal.
		    throw new ServletException("Can't have request parameter " +
					       " jsp_precomile set to " + precom);
		}
	    }
        else if (qString != null && (qString.startsWith(Constants.PRECOMPILE) ||
                                     qString.indexOf("&" + Constants.PRECOMPILE)
                                     != -1))
            precompile = true;

        return precompile;
    }
    
    

    public void service (HttpServletRequest request, 
    			 HttpServletResponse response)
	throws ServletException, IOException
    {
	try {
            String includeUri 
                = (String) request.getAttribute(Constants.INC_SERVLET_PATH);

            String jspUri;

            if (includeUri == null)
		jspUri = request.getServletPath();
            else
                jspUri = includeUri;

//	    System.out.println("JspServletWrapper: " + includeUri + " " +
//                            jspUri + 
// 			       (String) request.getAttribute(
//                                  Constants.INC_REQUEST_URI));

            boolean precompile = preCompile(request);

	    Logger jasperLog = Constants.jasperLog;
	    
            if (jasperLog != null &&
		jasperLog.matchVerbosityLevel(Logger.INFORMATION))
		{
		    jasperLog.log("JspEngine --> "+jspUri);
		    jasperLog.log("\t     ServletPath: "+request.getServletPath());
		    jasperLog.log("\t        PathInfo: "+request.getPathInfo());
		    jasperLog.log("\t        RealPath: "
				  +getServletConfig().getServletContext().getRealPath(jspUri));
		    jasperLog.log("\t      RequestURI: "+request.getRequestURI());
		    jasperLog.log("\t     QueryString: "+request.getQueryString());
		    jasperLog.log("\t  Request Params: ");
		    Enumeration e = request.getParameterNames();
		    while (e.hasMoreElements()) {
			String name = (String) e.nextElement();
			jasperLog.log("\t\t "+name+" = "+request.getParameter(name));
		    }
		}
            serviceJspFile(request, response, jspUri, null, precompile);
	} catch (RuntimeException e) {
	    throw e;
	} catch (ServletException e) {
	    throw e;
	} catch (IOException e) {
	    throw e;
	} catch (Throwable e) {
	    throw new ServletException(e);
	}

	// It's better to throw the exception - we don't
	// know if we can deal with sendError ( buffer may be
	// commited )
	// catch (Throwable t) {
	// 	    unknownException(response, t);
	// 	}
    }

    public void destroy() {
	if (Constants.jasperLog != null)
	    Constants.jasperLog.log("JspServlet.destroy()", Logger.INFORMATION);

	Enumeration servlets = jsps.elements();
	while (servlets.hasMoreElements()) 
	    ((JspServletWrapper) servlets.nextElement()).destroy();
    }


    /*  Check if we need to reload a JSP page.
     *
     *  Side-effect: re-compile the JSP page.
     *
     *  @param classpath explicitly set the JSP compilation path.
     *  @return true if JSP files is newer
     */
    boolean loadJSP(String jspUri, String classpath, 
	boolean isErrorPage, HttpServletRequest req, HttpServletResponse res) 
	throws JasperException, FileNotFoundException 
    {
	// Loader knows how to set the right priviledges, and call
	// doLoadeJsp
	return loader.loadJSP( this,jspUri, classpath, isErrorPage, req, res );
    }

    /*  Check if we need to reload a JSP page.
     *
     *  Side-effect: re-compile the JSP page.
     *
     *  @param classpath explicitly set the JSP compilation path.
     *  @return true if JSP files is newer
     */
    protected boolean doLoadJSP(String jspUri, String classpath, 
	boolean isErrorPage, HttpServletRequest req, HttpServletResponse res) 
	throws JasperException, FileNotFoundException 
    {
	JspServletWrapper jsw=(JspServletWrapper) jsps.get(jspUri);
	if( jsw==null ) {
	    throw new JasperException("Can't happen - JspServletWrapper=null");
	}
	//	Class jspClass = (Class) loadedJSPs.get(jspUri);
	boolean firstTime = jsw.servletClass == null;
        JspCompilationContext ctxt = new JspEngineContext(loader, classpath,
                                                     context, jspUri, 
                                                     isErrorPage, options,
                                                     req, res);
	boolean outDated = false; 

        Compiler compiler = ctxt.createCompiler();
        
        try {
            outDated = compiler.compile();
            if ( (jsw.servletClass == null) || (compiler.isOutDated()) ) {
                synchronized ( this ) {
                    if ((jsw.servletClass == null) ||
			(compiler.isOutDated() ))  {
                        outDated = compiler.compile();
                    }
		}
            }
        } catch (FileNotFoundException ex) {
            throw ex;
        } catch (JasperException ex) {
            throw ex;
        } catch (Exception ex) {
	    throw new JasperException(Constants.getString("jsp.error.unable.compile"),
                                      ex);
	}

	// Reload only if it's outdated
	if((jsw.servletClass == null) || outDated) {
	    try {
		if( null ==ctxt.getServletClassName() ) {
		    compiler.computeServletClassName();
		}
		jsw.servletClass = loader.loadClass(ctxt.getFullClassName());
                        //loadClass(ctxt.getFullClassName(), true);
	    } catch (ClassNotFoundException cex) {
		throw new JasperException(Constants.getString("jsp.error.unable.load"), 
					  cex);
	    }
	    
	    //	    loadedJSPs.put(jspUri, jspClass);
	}
	
	return outDated;
    }

        /**
     * Determines whether the current JSP class is older than the JSP file
     * from whence it came
     */
    public boolean isOutDated(File jsp, JspCompilationContext ctxt,
			      Mangler mangler ) {
        File jspReal = null;
	boolean outDated;
	
        jspReal = new File(ctxt.getRealPath(jsp.getPath()));

        File classFile = new File(mangler.getClassFileName());
        if (classFile.exists()) {
            outDated = classFile.lastModified() < jspReal.lastModified();
        } else {
            outDated = true;
        }

        return outDated;
    }

}