/* */package com.sun.j2ee.workflow.control.web;import java.util.*;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import java.io.*;import com.sun.j2ee.workflow.util.Debug;import com.sun.j2ee.workflow.util.WebKeys;import com.sun.j2ee.workflow.control.exceptions.WorkflowActionException;import com.sun.j2ee.workflow.control.web.ScreenFlowManager;import com.sun.j2ee.workflow.control.actions.ActionHandler;/** * @author Jian (James) Cai */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) throws WorkflowActionException, IOException {        HashMap event = getEvent(request);        String selectedUrl = request.getPathInfo();        Debug.println("RequestProcessor: processRequest: " + selectedUrl);       /*         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);        }        */       ActionHandler handler = getHandler(selectedUrl);              if (handler != null) {           handler.setServletContext(context); //set the servlet context for handler           handler.setServletRequest(request);           handler.doStart();           //try{           handler.perform(event);        /*           }           catch (Exception ex)           {                   Debug.println("RequestProcessor caught handler perform(): " + ex);                                  throw ex;                              }           */           handler.doEnd();        }    }    /**     * This method load the necessary ActionHandler class necessary to process a the     * request for the specified URL.     */    private ActionHandler getHandler(String selectedUrl) {        ActionHandler handler = null;        URLMapping urlMapping = getURLMapping(selectedUrl);        String requestProcessorString = null;        if (urlMapping != null) {            requestProcessorString = urlMapping.getActionHandler();            if (urlMapping.useActionHandler()) {                try {                    //handler = (ActionHandler)getClass().getClassLoader().loadClass(requestProcessorString).newInstance();                    handler = (ActionHandler)Class.forName(requestProcessorString).newInstance();                    Debug.println("RequestProcessor: loaded handler " + requestProcessorString);                } catch (Exception ex) {                   Debug.println("RequestProcessor caught loading handler: " + ex);                }            }        }        return handler;    }        private HashMap getEvent(HttpServletRequest request)    {        HashMap event = new HashMap();        String parmName = null;        String parmValue = null;        for (Enumeration enum = request.getParameterNames() ; enum.hasMoreElements() ;)         {             parmName = (String)enum.nextElement();                      Debug.println("getEvent: "+ parmName);             parmValue = request.getParameter(parmName);                                  Debug.println("getEvent: "+ parmValue);             event.put(parmName, parmValue);              }         event.put("session", request.getSession());        return event;    }}