/* */package com.sun.j2ee.workflow.control.web;import java.util.Collection;import java.util.HashMap;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.io.*;import java.rmi.RemoteException;import com.sun.j2ee.workflow.util.Debug;import com.sun.j2ee.workflow.util.WebKeys;import com.sun.j2ee.workflow.control.exceptions.StarsEventException;import com.sun.j2ee.workflow.control.web.ScreenFlowManager;import com.sun.j2ee.workflow.control.web.actions.RequestHandler;/** * */public class RequestProcessor implements java.io.Serializable {    private ServletContext context;    private HashMap urlMappings;    /** Empty constructor for use by the JSP engine. */    public RequestProcessor() {}    public void init(ServletContext context) {        this.context = context;        urlMappings = (HashMap)context.getAttribute(WebKeys.URLMappingsKey);    }    /**    */    private URLMapping getURLMapping(String urlPattern) {        if ((urlMappings != null) && urlMappings.containsKey(urlPattern)) {            return (URLMapping)urlMappings.get(urlPattern);        } else {            return null;        }    }    /**    * This method is the core of the RequestProcessor. It receives all requests    *  and generates the necessary events.    */    public void processRequest(HttpServletRequest request, HttpServletResponse response) throws StarsEventException, IOException {        StarsEvent event = null;        String selectedUrl = request.getPathInfo();        String checkresult = null; //to check the access control        PrintWriter out = response.getWriter();        ModelManager mm = (ModelManager)request.getSession().getAttribute(WebKeys.ModelManagerKey);        // application level ModelManager         AppModelManager apmm = (AppModelManager)context.getAttribute(WebKeys.AppModelManagerKey);        // application level checkermanager        CheckerManager chm = (CheckerManager)context.getAttribute(WebKeys.CheckerManagerKey);        UserHandlerWebImpl ucrwimpl = (UserHandlerWebImpl)request.getSession().getAttribute(WebKeys.WebHandlerKey);        if (ucrwimpl == null) {            ucrwimpl = new UserHandlerWebImpl(request.getSession());            mm.setURC(ucrwimpl);            request.getSession().setAttribute(WebKeys.WebHandlerKey, ucrwimpl);        }       RequestHandler handler = getHandler(selectedUrl);       if (handler != null) {           handler.setServletContext(context);           handler.doStart(request);           event = handler.processRequest(request);           //check the consistency for this even                      if (event != null) {                                  checkresult = chm.checkEvent(event);                   if(checkresult.equals("OK"))                   {                       chm.doStart(event); //update model state                       Collection updatedModelList = ucrwimpl.handleEvent(event);                       mm.notifyListeners(updatedModelList);                       apmm.notifyListeners(updatedModelList);                       chm.doEnd(event); //reset model state                   }                   out.println(checkresult);           }           handler.doEnd(request);        }       out.close();    }    /**     * This method load the necessary RequestHandler class necessary to process a the     * request for the specified URL.     */    private RequestHandler getHandler(String selectedUrl) {        RequestHandler handler = null;        URLMapping urlMapping = getURLMapping(selectedUrl);        String requestProcessorString = null;        if (urlMapping != null) {            requestProcessorString = urlMapping.getRequestHandler();            if (urlMapping.useRequestHandler()) {                try {                    Debug.println("RequestProcessor: loading handler " + requestProcessorString);                    handler = (RequestHandler)getClass().getClassLoader().loadClass(requestProcessorString).newInstance();                    Debug.println("RequestProcessor: loaded handler " + requestProcessorString);                } catch (Exception ex) {                   Debug.println("RequestProcessor caught loading handler: " + ex);                }            }        }        return handler;    }}