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You acknowledge that Software is not designed, licensed or intended for use in the design, construction, operation or maintenance of any nuclear facility. $Id: RequestProcessor.java,v 1.1 2004/04/15 03:44:06 yutayoshida Exp $ */package com.sun.j2ee.blueprints.waf.controller.web;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;// WAF importsimport com.sun.j2ee.blueprints.waf.util.JNDINames;import com.sun.j2ee.blueprints.waf.controller.web.util.WebKeys;import com.sun.j2ee.blueprints.waf.controller.*;// tracer importimport com.sun.j2ee.blueprints.util.tracer.Debug;/**  * This is the web tier controller for the sample application. * * This class is responsible for processing web requests  * that could originate from any number of front controllers * * This class is responsible for ensuring that the dependencies * of the client accessing the controller prior to the being * passed off to the WebController. *  */public class RequestProcessor implements java.io.Serializable {    private ServletContext context;    private HashMap urlMappings;    private HashMap eventMappings;    private HashMap actionMap;    public RequestProcessor() {        actionMap = new HashMap();    }    public void init(ServletContext context) {        this.context = context;        urlMappings = (HashMap)context.getAttribute(WebKeys.URL_MAPPINGS);        eventMappings = (HashMap)context.getAttribute(WebKeys.EVENT_MAPPINGS);    }        /**     * The UrlMapping object contains information that will match     * a url to a mapping object that contains information about     * the current screen, the HTMLAction that is needed to     * process a request, and the HTMLAction that is needed     * to insure that the propper screen is displayed.    */    private URLMapping getURLMapping(String urlPattern) {        if ((urlMappings != null) && urlMappings.containsKey(urlPattern)) {            return (URLMapping)urlMappings.get(urlPattern);        } else {            return null;        }    }    /**     * The EventMapping object contains information that will match     * a event class name to an EJBActionClass.     *    */    private EventMapping getEventMapping(Event eventClass) {        // get the fully qualified name of the event class        String eventClassName = eventClass.getClass().getName();        if ((eventMappings != null) && eventMappings.containsKey(eventClassName)) {            return (EventMapping)eventMappings.get(eventClassName);        } else {            return null;        }    }    /**    * This method is the core of the RequestProcessor. It receives all requests    *  and generates the necessary events.    */    public void processRequest(URLMapping urlMapping, ServletRequest request)          throws ActionException, EventException, ServletException {        Event ev = null;        Action action = getAction(urlMapping);        if (action != null) {            action.setServletContext(context);            action.doStart(request);            ev = action.perform(request);            EventResponse eventResponse = null;            if (ev != null) {               // set the command class name on the event                EventMapping eventMapping = getEventMapping(ev);                if (eventMapping != null) {                    ev.setCommandClassName(eventMapping.getCommandClassName());                }                HttpSession session = ((HttpServletRequest)request).getSession();                ComponentManager cm =                       (ComponentManager)session.getAttribute(WebKeys.COMPONENT_MANAGER);               WebController wc = cm.getWebController(session);         eventResponse  = wc.handleEvent(ev, session);           }           action.doEnd(request, eventResponse);        }    }        /**     * This method load the necessary Action class necessary to     * process a the request for the specified URL. Action instances     * are cached so that they may be re-used.     */    private Action getAction(URLMapping urlMapping) {        Action handler = null;        if (urlMapping != null) {                  if (urlMapping.isAction()) {                String actionClassString = urlMapping.getWebAction();                if ((actionClassString != null) &&                    actionMap.containsKey(actionClassString)) {                        handler = (Action)actionMap.get(actionClassString);                } else {                    try {                        handler = (Action)getClass().getClassLoader().loadClass(actionClassString).newInstance();                        actionMap.put(actionClassString, handler);                    } catch (Exception ex) {                        ex.printStackTrace();                        Debug.print("RequestProcessor caught loading action: " + ex);                              }                }            }        }        return handler;    }}