/*

  * Copyright 2005-2007 The Kuali Foundation

  * 

  * Licensed under the Educational Community License, Version 2.0 (the "License"); you may not use this file except in

  * compliance with the License. You may obtain a copy of the License at

  * 

  * http://www.opensource.org/licenses/ecl2.php

  * 

  * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS

  * IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific

  * language governing permissions and limitations under the License.

  */

 package org.kuali.rice.kns.web.struts.action;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 import org.apache.log4j.MDC;

 import org.apache.ojb.broker.OptimisticLockException;

 import org.apache.struts.Globals;

 import org.apache.struts.action.*;

 import org.apache.struts.config.FormBeanConfig;

 import org.apache.struts.config.ForwardConfig;

 import org.apache.struts.util.RequestUtils;

 import org.kuali.rice.core.util.RiceConstants;

 import org.kuali.rice.core.util.RiceKeyConstants;

 import org.kuali.rice.kns.UserSession;

 import org.kuali.rice.kns.document.Document;

 import org.kuali.rice.kns.exception.FileUploadLimitExceededException;

 import org.kuali.rice.kns.exception.ValidationException;

 import org.kuali.rice.kns.service.KNSServiceLocator;

 import org.kuali.rice.kns.service.KNSServiceLocatorInternal;

 import org.kuali.rice.kns.service.KNSServiceLocatorWeb;

 import org.kuali.rice.kns.service.SessionDocumentService;

 import org.kuali.rice.kns.util.*;

 import org.kuali.rice.kns.web.EditablePropertiesHistoryHolder;

 import org.kuali.rice.kns.web.struts.form.KualiDocumentFormBase;

 import org.kuali.rice.kns.web.struts.form.KualiForm;

 import org.kuali.rice.kns.web.struts.pojo.PojoForm;

 import org.springframework.transaction.PlatformTransactionManager;

 import org.springframework.transaction.TransactionStatus;

 import org.springframework.transaction.support.TransactionCallback;

 import org.springframework.transaction.support.TransactionTemplate;

 import org.springmodules.orm.ojb.OjbOperationException;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import javax.servlet.http.HttpSession;

 import java.io.IOException;

 /**

  * This class handles setup of user session and restoring of action form.

  * 

  * 

  */

 public class KualiRequestProcessor extends RequestProcessor {

         private static final String MDC_DOC_ID = "docId";

         private static final String PREVIOUS_REQUEST_EDITABLE_PROPERTIES_GUID_PARAMETER_NAME = "actionEditablePropertiesGuid";

         private static Logger LOG = Logger.getLogger(KualiRequestProcessor.class);

         private SessionDocumentService sessionDocumentService;

         private PlatformTransactionManager transactionManager;

         @Override

         public void process(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

                 if ( LOG.isInfoEnabled() ) {

                         LOG.info(new StringBuffer("Started processing request: '").append(request.getRequestURI()).append("' w/ query string: '").append(request.getQueryString()).append("'"));

                 }

                 try { 

                         strutsProcess(request, response);

                 } catch (FileUploadLimitExceededException e) {

                         ActionForward actionForward = processException(request, response, e, e.getActionForm(), e.getActionMapping());

                         processForwardConfig(request, response, actionForward);

                 } finally {

                         GlobalVariables.setKualiForm(null);

                 }

                 try {

                         ActionForm form = WebUtils.getKualiForm(request);

                         if (form != null && form instanceof KualiDocumentFormBase) {

                                 String docId = ((KualiDocumentFormBase) form).getDocId();

                                 if (docId != null) { MDC.put(MDC_DOC_ID, docId); }

                         }

                         String refreshCaller = request.getParameter(KNSConstants.REFRESH_CALLER);

                         if (form!=null && KualiDocumentFormBase.class.isAssignableFrom(form.getClass()) 

                                         && !KNSConstants.QUESTION_REFRESH.equalsIgnoreCase(refreshCaller)) {

                                 KualiDocumentFormBase docForm = (KualiDocumentFormBase) form;

                                 Document document = docForm.getDocument();

                                 String docFormKey = docForm.getFormKey();

                                 UserSession userSession = (UserSession) request.getSession().getAttribute(KNSConstants.USER_SESSION_KEY);

                                 if (WebUtils.isDocumentSession(document, docForm)) {

                                         getSessionDocumentService().setDocumentForm(docForm, userSession, request.getRemoteAddr());

                                 }

                                 Boolean exitingDocument = (Boolean) request.getAttribute(KNSConstants.EXITING_DOCUMENT);

                                 if (exitingDocument != null && exitingDocument.booleanValue()) {

                                         // remove KualiDocumentFormBase object from session and

                                         // table.

                                         getSessionDocumentService().purgeDocumentForm(docForm.getDocument().getDocumentNumber(), docFormKey, userSession, request.getRemoteAddr());

                                 }

                         }

                         if ( LOG.isInfoEnabled() ) {

                                 LOG.info(new StringBuffer("Finished processing request: '").append(request.getRequestURI()).append("' w/ query string: '").append(request.getQueryString()).append("'"));

                         }

                 } finally {

                         // MDC docId key is set above, and also during super.process() in the call to processActionForm

                         MDC.remove(MDC_DOC_ID);

                 }

         }

         @Override

         protected boolean processPreprocess(HttpServletRequest request, HttpServletResponse response) {

         final UserSession session = WebUtils.getUserSessionFromRequest(request);

         if (session == null) {

                 throw new IllegalStateException("the user session has not been established");

         }

             GlobalVariables.setUserSession(session);

             GlobalVariables.clear();

                 return true;

         }

         /**

      * <p>Process an <code>HttpServletRequest</code> and create the

      * corresponding <code>HttpServletResponse</code> or dispatch

      * to another resource.</p>

      *

      * @param request The servlet request we are processing

      * @param response The servlet response we are creating

      *

      * @exception IOException if an input/output error occurs

      * @exception ServletException if a processing exception occurs

      */

     public void strutsProcess(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

         // Wrap multipart requests with a special wrapper

         request = processMultipart(request);

         // Identify the path component we will use to select a mapping

         String path = processPath(request, response);

         if (path == null) {

             return;

         }

         if (log.isDebugEnabled()) {

             log.debug("Processing a '" + request.getMethod() +

                       "' for path '" + path + "'");

         }

         // Select a Locale for the current user if requested

         processLocale(request, response);

         // Set the content type and no-caching headers if requested

         processContent(request, response);

         processNoCache(request, response);

         // General purpose preprocessing hook

         if (!processPreprocess(request, response)) {

             return;

         }

         this.processCachedMessages(request, response);

         // Identify the mapping for this request

         ActionMapping mapping = processMapping(request, response, path);

         if (mapping == null) {

             return;

         }

         // Check for any role required to perform this action

         if (!processRoles(request, response, mapping)) {

             return;

         }

         processFormActionAndForward(request, response, mapping);

     }

     public void processFormActionAndForward(final HttpServletRequest request, final HttpServletResponse response, final ActionMapping mapping) throws ServletException, IOException {

             TransactionTemplate template = new TransactionTemplate(getTransactionManager());

             try {

                         template.execute(new TransactionCallback() {

                                 @Override

                                 public Object doInTransaction(TransactionStatus status) {

                                         try {

                                                 // Process any ActionForm bean related to this request

                                         ActionForm form = processActionForm(request, response, mapping);

                                         processPopulate(request, response, form, mapping);

                                         // Validate any fields of the ActionForm bean, if applicable

                                         try {

                                             if (!processValidate(request, response, form, mapping)) {

                                                 return null;

                                             }

                                         } catch (InvalidCancelException e) {

                                             ActionForward forward = processException(request, response, e, form, mapping);

                                             processForwardConfig(request, response, forward);

                                             return null;

                                         } catch (IOException e) {

                                             throw e;

                                         } catch (ServletException e) {

                                             throw e;

                                         }

                                         // Process a forward or include specified by this mapping

                                         if (!processForward(request, response, mapping)) {

                                             return null;

                                         }

                                         if (!processInclude(request, response, mapping)) {

                                             return null;

                                         }

                                         // Create or acquire the Action instance to process this request

                                         Action action = processActionCreate(request, response, mapping);

                                         if (action == null) {

                                             return null;

                                         }

                                             // Call the Action instance itself

                                         ActionForward forward = processActionPerform(request, response, action, form, mapping);

                                         // Process the returned ActionForward instance

                                         processForwardConfig(request, response, forward);

                                         } catch (Exception e) {

                                                 // the doInTransaction method has no means for

                                                 // throwing exceptions, so we will wrap the

                                                 // exception in

                                                 // a RuntimeException and re-throw. The one caveat

                                                 // here is that this will always result in

                                                 // the

                                                 // transaction being rolled back (since

                                                 // WrappedRuntimeException is a runtime exception).

                                                 throw new WrappedRuntimeException(e);

                                         }

                                         return null;

                                 }

                         });

                 } catch (WrappedRuntimeException wre) {

                         throw new RuntimeException(wre.getCause());

                 }

     }

         /**

          * This method gets the document number from the request.  The request should have been processed already 

          * before this is called if it is multipart.  

          * 

          * @param request

          * @return the document number, or null if one can't be found in the request.

          */

         private String getDocumentNumber(HttpServletRequest request) {

                 String documentNumber = request.getParameter(KNSConstants.DOCUMENT_DOCUMENT_NUMBER);

                 // from lookup pages.

                 if (documentNumber == null) {

                         documentNumber = request.getParameter(KNSConstants.DOC_NUM);

                 }

                 if (documentNumber == null) {

                         documentNumber = request.getParameter("documentId");

                 }

                 return documentNumber;

         }

         /**

          * Hooks into populate process to call form populate method if form is an

          * instanceof PojoForm.

          */

         @Override

         protected void processPopulate(HttpServletRequest request, HttpServletResponse response, ActionForm form, ActionMapping mapping) throws ServletException {

                 if (form instanceof KualiForm) {

                         // Add the ActionForm to GlobalVariables

                         // This will allow developers to retrieve both the Document and any

                         // request parameters that are not

                         // part of the Form and make them available in ValueFinder classes

                         // and other places where they are needed.

                         GlobalVariables.setKualiForm((KualiForm) form);

                 }

                 // if not PojoForm, call struts populate

                 if (!(form instanceof PojoForm)) {

                         super.processPopulate(request, response, form, mapping);

                         return;

                 }

                 final String previousRequestGuid = request.getParameter(KualiRequestProcessor.PREVIOUS_REQUEST_EDITABLE_PROPERTIES_GUID_PARAMETER_NAME);

                 ((PojoForm)form).clearEditablePropertyInformation();

                 ((PojoForm)form).registerStrutsActionMappingScope(mapping.getScope());

                 String multipart = mapping.getMultipartClass();

                 if (multipart != null) {

                         request.setAttribute(Globals.MULTIPART_KEY, multipart);

                 }

                 form.setServlet(this.servlet);

                 form.reset(mapping, request);

                 ((PojoForm)form).setPopulateEditablePropertiesGuid(previousRequestGuid);

                 // call populate on ActionForm

                 ((PojoForm) form).populate(request);

                 request.setAttribute("UnconvertedValues", ((PojoForm) form).getUnconvertedValues().keySet());

                 request.setAttribute("UnconvertedHash", ((PojoForm) form).getUnconvertedValues());

         }

         /**

          * Hooks into validate to catch any errors from the populate, and translate

          * the ErrorMap to ActionMessages.

          */

         @Override

         protected boolean processValidate(HttpServletRequest request, HttpServletResponse response, ActionForm form, ActionMapping mapping) throws IOException, ServletException, InvalidCancelException {

                 // skip form validate if we had errors from populate

                 if (GlobalVariables.getMessageMap().hasNoErrors()) {

                         if (form == null) {

                                 return (true);

                         }

                         // Was this request cancelled?

                         if (request.getAttribute(Globals.CANCEL_KEY) != null) {

                                 if (LOG.isDebugEnabled()) {

                                         LOG.debug(" Cancelled transaction, skipping validation");

                                 }

                                 return (true);

                         }

                         // Has validation been turned off for this mapping?

                         if (!mapping.getValidate()) {

                                 return (true);

                         }

                         // call super to call forms validate

                         super.processValidate(request, response, form, mapping);

                 }

                 publishMessages(request);

                 if (!GlobalVariables.getMessageMap().hasNoErrors()) {

                         // Special handling for multipart request

                         if (form.getMultipartRequestHandler() != null) {

                                 if (LOG.isDebugEnabled()) {

                                         LOG.debug("  Rolling back multipart request");

                                 }

                                 form.getMultipartRequestHandler().rollback();

                         }

                         // Fix state that could be incorrect because of validation failure

                         if (form instanceof PojoForm) {

                                 ((PojoForm) form).processValidationFail();

                         }

                         // Was an input path (or forward) specified for this mapping?

                         String input = mapping.getInput();

                         if (input == null) {

                                 if (LOG.isDebugEnabled()) {

                                         LOG.debug("  Validation failed but no input form available");

                                 }

                                 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, getInternal().getMessage("noInput", mapping.getPath()));

                                 return (false);

                         }

                         if (moduleConfig.getControllerConfig().getInputForward()) {

                                 ForwardConfig forward = mapping.findForward(input);

                                 processForwardConfig(request, response, forward);

                         } else {

                                 internalModuleRelativeForward(input, request, response);

                         }

                         return (false);

                 }

                 return true;

         }

         /**

          * Checks for return from a lookup or question, and restores the action form

          * stored under the request parameter docFormKey.

          */

         @Override

         protected ActionForm processActionForm(HttpServletRequest request, HttpServletResponse response, ActionMapping mapping) {

                 String documentNumber = getDocumentNumber(request);

                 if (documentNumber != null) { MDC.put(MDC_DOC_ID, documentNumber); }

                 UserSession userSession = (UserSession) request.getSession().getAttribute(KNSConstants.USER_SESSION_KEY);

                 String docFormKey = request.getParameter(KNSConstants.DOC_FORM_KEY);

                 String methodToCall = request.getParameter(KNSConstants.DISPATCH_REQUEST_PARAMETER);

                 String refreshCaller = request.getParameter(KNSConstants.REFRESH_CALLER);

 //                String searchListRequestKey = request.getParameter(KNSConstants.SEARCH_LIST_REQUEST_KEY);

                 String documentWebScope = request.getParameter(KNSConstants.DOCUMENT_WEB_SCOPE);

                 if (mapping.getPath().startsWith(KNSConstants.REFRESH_MAPPING_PREFIX) || KNSConstants.RETURN_METHOD_TO_CALL.equalsIgnoreCase(methodToCall) ||

                                 KNSConstants.QUESTION_REFRESH.equalsIgnoreCase(refreshCaller) || KNSConstants.TEXT_AREA_REFRESH.equalsIgnoreCase(refreshCaller) || KNSConstants.SESSION_SCOPE.equalsIgnoreCase(documentWebScope)) {

                         ActionForm form = null;

                         // check for search result storage and clear

                         GlobalVariables.getUserSession().removeObjectsByPrefix(KNSConstants.SEARCH_LIST_KEY_PREFIX);

                         // We put different type of forms such as document form, lookup form

                         // in session but we only store document form in

                         // database.

                         if (userSession.retrieveObject(docFormKey) != null) {

                                 LOG.debug("getDecomentForm KualiDocumentFormBase from session");

                                 form = (ActionForm) userSession.retrieveObject(docFormKey);

                         } else {

                                 form = getSessionDocumentService().getDocumentForm(documentNumber, docFormKey, userSession, request.getRemoteAddr());

                         }

                         request.setAttribute(mapping.getAttribute(), form);

                         if (!KNSConstants.SESSION_SCOPE.equalsIgnoreCase(documentWebScope)) {

                                 userSession.removeObject(docFormKey);

                         }

                         // we should check whether this is a multipart request because we

                         // could have had a combination of query parameters and a multipart

                         // request

                         String contentType = request.getContentType();

                         String method = request.getMethod();

                         if (("POST".equalsIgnoreCase(method) && contentType != null && contentType.startsWith("multipart/form-data"))) {

                                 // this method parses the multipart request and adds new

                                 // non-file parameters into the request

                                 WebUtils.getMultipartParameters(request, null, form, mapping);

                         }

                         // The form can be null if the document is not a session document

                         if (form != null) {

                                 return form;

                         }

                 }

                 // Rice has the ability to limit file upload sizes on a per-form basis,

                 // so the max upload sizes may be accessed by calling methods on

                 // PojoFormBase.

                 // This requires that we are able know the file upload size limit (i.e.

                 // retrieve a form instance) before we parse a mulitpart request.

                 ActionForm form = super.processActionForm(request, response, mapping);

                 // for sessiondocument with multipart request

                 String contentType = request.getContentType();

                 String method = request.getMethod();

                 if ("GET".equalsIgnoreCase(method) && StringUtils.isNotBlank(methodToCall) && form instanceof PojoForm &&

                                 ((PojoForm) form).getMethodToCallsToBypassSessionRetrievalForGETRequests().contains(methodToCall)) {

                         return createNewActionForm(mapping, request);

                 }

                 // if we have a multipart request, parse it and return the stored form

                 // from session if the doc form key is not blank. If it is blank, then

                 // we just return the form

                 // generated from the superclass processActionForm method. Either way,

                 // we need to parse the mulitpart request now so that we may determine

                 // what the value of the doc form key is.

                 // This is generally against the contract of processActionForm, because

                 // processPopulate should be responsible for parsing the mulitpart

                 // request, but we need to parse it now

                 // to determine the doc form key value.

                 if (("POST".equalsIgnoreCase(method) && contentType != null && contentType.startsWith("multipart/form-data"))) {

                         WebUtils.getMultipartParameters(request, null, form, mapping);

                         docFormKey = request.getParameter(KNSConstants.DOC_FORM_KEY);

                         documentWebScope = request.getParameter(KNSConstants.DOCUMENT_WEB_SCOPE);

                         documentNumber = getDocumentNumber(request);

                         if (KNSConstants.SESSION_SCOPE.equalsIgnoreCase(documentWebScope) ||

                                         (form instanceof KualiDocumentFormBase && WebUtils.isDocumentSession(((KualiDocumentFormBase) form).getDocument(), (KualiDocumentFormBase) form))) {

                                 Object userSessionObject = userSession.retrieveObject(docFormKey);

                                 if ( userSessionObject != null &&  userSessionObject instanceof ActionForm ) {

                                         LOG.debug("getDocumentForm KualiDocumentFormBase from session");

                                         form = (ActionForm) userSessionObject;

                                 } else {

                                         ActionForm tempForm = getSessionDocumentService().getDocumentForm(documentNumber, docFormKey, userSession, request.getRemoteAddr());

                                         if ( tempForm != null ) {

                                                 form = tempForm;

                                         }

                                 }

                                 request.setAttribute(mapping.getAttribute(), form);

                                 if (form != null) {

                                         return form;

                                 }

                         }

                 }

                 return form;

         }

         /**

          * Hook into action perform to handle errors in the error map and catch

          * exceptions.

          * 

          * <p>

          * A transaction is started prior to the execution of the action. This

          * allows for the action code to execute efficiently without the need for

          * using PROPAGATION_SUPPORTS in the transaction definitions. The

          * PROPAGATION_SUPPORTS propagation type does not work well with JTA.

          */

         @Override

         protected ActionForward processActionPerform(final HttpServletRequest request, final HttpServletResponse response, final Action action, final ActionForm form, final ActionMapping mapping) throws IOException, ServletException {

                 try {

                         ActionForward forward = action.execute(mapping, form, request, response);

                         publishMessages(request);

                         saveMessages(request);

                         saveAuditErrors(request);

                         if (form instanceof PojoForm) {

                                 if (((PojoForm)form).getEditableProperties() == null 

                                                 || ((PojoForm)form).getEditableProperties().isEmpty()) {

                                         EditablePropertiesHistoryHolder holder = (EditablePropertiesHistoryHolder) GlobalVariables.getUserSession().getObjectMap().get(KNSConstants.EDITABLE_PROPERTIES_HISTORY_HOLDER_ATTR_NAME);

                                     if (holder == null) {

                                             holder = new EditablePropertiesHistoryHolder();

                                     }

                                         final String guid = holder.addEditablePropertiesToHistory(((PojoForm)form).getEditableProperties());

                                     ((PojoForm)form).setActionEditablePropertiesGuid(guid);

                                     GlobalVariables.getUserSession().addObject(KNSConstants.EDITABLE_PROPERTIES_HISTORY_HOLDER_ATTR_NAME, holder);

                                 }

                         }

                         return forward;

                 } catch (Exception e) {

                         if (e instanceof WrappedRuntimeException) {

                                 e = (Exception) e.getCause();

                         }

                         if (e instanceof ValidationException) {

                                 // add a generic error message if there are none

                                 if (GlobalVariables.getMessageMap().hasNoErrors()) {

                                         GlobalVariables.getMessageMap().putError(KNSConstants.GLOBAL_ERRORS, RiceKeyConstants.ERROR_CUSTOM, e.getMessage());

                                 }

                                 if (form instanceof PojoForm) {

                                         if (((PojoForm)form).getEditableProperties() == null 

                                                         || ((PojoForm)form).getEditableProperties().isEmpty()) {

                                             EditablePropertiesHistoryHolder holder = (EditablePropertiesHistoryHolder) GlobalVariables.getUserSession().getObjectMap().get(KNSConstants.EDITABLE_PROPERTIES_HISTORY_HOLDER_ATTR_NAME);

                                         if (holder == null) {

                                                 holder = new EditablePropertiesHistoryHolder();

                                         }

                                             final String guid = holder.addEditablePropertiesToHistory(((PojoForm)form).getEditableProperties());

                                         ((PojoForm)form).setActionEditablePropertiesGuid(guid);

                                         GlobalVariables.getUserSession().addObject(KNSConstants.EDITABLE_PROPERTIES_HISTORY_HOLDER_ATTR_NAME, holder);

                                         }

                                 }                        

                                 // display error messages and return to originating page

                                 publishMessages(request);

                                 return mapping.findForward(RiceConstants.MAPPING_BASIC);

                         }

                         publishMessages(request);

                         return (processException(request, response, e, form, mapping));

                 }

         }

         /**

          * Adds more detailed logging for unhandled exceptions

          * 

          * @see org.apache.struts.action.RequestProcessor#processException(HttpServletRequest,

          *      HttpServletResponse, Exception, ActionForm, ActionMapping)

          */

         @Override

         protected ActionForward processException(HttpServletRequest request, HttpServletResponse response, Exception exception, ActionForm form, ActionMapping mapping) throws IOException, ServletException {

                 ActionForward actionForward = null;

                 try {

                         actionForward = super.processException(request, response, exception, form, mapping);

                 } catch (IOException e) {

                         logException(e);

                         throw e;

                 } catch (ServletException e) {

                         // special case, to make OptimisticLockExceptions easier to read

                         Throwable rootCause = e.getRootCause();

                         if (rootCause instanceof OjbOperationException) {

                                 OjbOperationException ooe = (OjbOperationException) rootCause;

                                 Throwable subcause = ooe.getCause();

                                 if (subcause instanceof OptimisticLockException) {

                                         OptimisticLockException ole = (OptimisticLockException) subcause;

                                         StringBuffer message = new StringBuffer(e.getMessage());

                                         Object sourceObject = ole.getSourceObject();

                                         if (sourceObject != null) {

                                                 message.append(" (sourceObject is ");

                                                 message.append(sourceObject.getClass().getName());

                                                 message.append(")");

                                         }

                                         e = new ServletException(message.toString(), rootCause);

                                 }

                         }

                         logException(e);

                         throw e;

                 }

                 return actionForward;

         }

         private void logException(Exception e) {

                 LOG.error("unhandled exception thrown by KualiRequestProcessor.processActionPerform", e);

         }

         /**

          * Checks for errors in the error map and transforms them to struts action

          * messages then stores in the request.

          */

         private void publishMessages(HttpServletRequest request) {

                 MessageMap errorMap = GlobalVariables.getMessageMap();

                 if (!errorMap.hasNoErrors()) {

                         ErrorContainer errorContainer = new ErrorContainer(errorMap);

                         request.setAttribute("ErrorContainer", errorContainer);

                         request.setAttribute(Globals.ERROR_KEY, errorContainer.getRequestErrors());

                         request.setAttribute("ErrorPropertyList", errorContainer.getErrorPropertyList());

                 }

                 if (errorMap.hasWarnings()) {

                         WarningContainer warningsContainer = new WarningContainer(errorMap);

                         request.setAttribute("WarningContainer", warningsContainer);

                         request.setAttribute("WarningActionMessages", warningsContainer.getRequestMessages());

                         request.setAttribute("WarningPropertyList", warningsContainer.getMessagePropertyList());

                 }

                 if (errorMap.hasInfo()) {

                         InfoContainer infoContainer = new InfoContainer(errorMap);

                         request.setAttribute("InfoContainer", infoContainer);

                         request.setAttribute("InfoActionMessages", infoContainer.getRequestMessages());

                         request.setAttribute("InfoPropertyList", infoContainer.getMessagePropertyList());

                 }

         }

         /**

          * Checks for messages in GlobalVariables and places list in request

          * attribute.

          */

         private void saveMessages(HttpServletRequest request) {

                 if (!GlobalVariables.getMessageList().isEmpty()) {

                         request.setAttribute(KNSConstants.GLOBAL_MESSAGES, GlobalVariables.getMessageList().toActionMessages());

                 }

         }

         /**

          * Checks for messages in GlobalVariables and places list in request

          * attribute.

          */

         private void saveAuditErrors(HttpServletRequest request) {

                 if (!GlobalVariables.getAuditErrorMap().isEmpty()) {

                         request.setAttribute(KNSConstants.AUDIT_ERRORS, GlobalVariables.getAuditErrorMap());

                 }

         }

         /**

          * A simple exception that allows us to wrap an exception that is thrown out

          * of a transaction template.

          */

         @SuppressWarnings("serial")

         private static class WrappedRuntimeException extends RuntimeException {

                 public WrappedRuntimeException(Exception e) {

                         super(e);

                 }

         }

         /**

          * @return the sessionDocumentService

          */

         public SessionDocumentService getSessionDocumentService() {

                 if ( sessionDocumentService == null ) {

                         sessionDocumentService = KNSServiceLocatorWeb.getSessionDocumentService();

                 }

                 return this.sessionDocumentService;

         }

         /**

          * @return the transactionManager

          */

         public PlatformTransactionManager getTransactionManager() {

                 if ( transactionManager == null ) {

                         transactionManager = KNSServiceLocatorInternal.getTransactionManager();

                 }

                 return this.transactionManager;

         }

         private ActionForm createNewActionForm(ActionMapping mapping, HttpServletRequest request) {

         String name = mapping.getName();

         FormBeanConfig config = moduleConfig.findFormBeanConfig(name);

         if (config == null) {

             log.warn("No FormBeanConfig found under '" + name + "'");

             return (null);

         }

         ActionForm instance = RequestUtils.createActionForm(config, servlet);

         if ("request".equals(mapping.getScope())) {

             request.setAttribute(mapping.getAttribute(), instance);

         } else {

             HttpSession session = request.getSession();

             session.setAttribute(mapping.getAttribute(), instance);

         }

         return instance;

         }

 }