/*

  * 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.kew.edl;

 import java.util.Iterator;

 import java.util.LinkedHashMap;

 import java.util.Map;

 import javax.xml.parsers.DocumentBuilderFactory;

 import javax.xml.transform.Templates;

 import org.apache.log4j.Logger;

 import org.kuali.rice.kew.edl.bo.EDocLiteAssociation;

 import org.kuali.rice.kew.edl.service.EDocLiteService;

 import org.kuali.rice.kew.exception.WorkflowRuntimeException;

 import org.kuali.rice.kew.routeheader.DocumentRouteHeaderValue;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.kuali.rice.kew.util.XmlHelper;

 import org.w3c.dom.Document;

 import org.w3c.dom.Element;

 import org.w3c.dom.Node;

 import org.w3c.dom.NodeList;

 /**

  * Creates EDL controllers.  Contains a cache of parsed EDL configurations.  The parsed config is a definition name related to 

  * a Map containing config element and their associated class.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  *

  */

 public class EDLControllerFactory {

         private static final Logger LOG = Logger.getLogger(EDLControllerFactory.class);

         private static final String CONFIG_CACHE_GROUP_NAME = "EDLConfig";

         //private static Map edlConfigCache = new HashMap();

         public static EDLController createEDLController(EDocLiteAssociation edlAssociation, EDLGlobalConfig edlGlobalConfig) {

         EDLController edlController = new EDLController();

                 edlController.setEdocLiteAssociation(edlAssociation);

                 try {

                         edlController.setEdlGlobalConfig(edlGlobalConfig);

                         edlController.setDefaultDOM(getDefaultDOM(edlAssociation));

                         loadConfigProcessors(edlController, edlGlobalConfig);

                         loadPreProcessors(edlController, edlGlobalConfig);

                         loadPostProcessor(edlController, edlGlobalConfig);

                         loadStateComponents(edlController, edlGlobalConfig);

                         loadStyle(edlController);

                 } catch (Exception e) {

             String edl = null;

             if (edlAssociation != null) {

                 edl = edlAssociation.getEdlName();

             }

             String message = "Error creating controller for EDL" + (edl == null ? "" : ": " + edl);

             LOG.error(message, e);

                         throw new WorkflowRuntimeException("Problems creating controller for EDL: " + edl, e);

                 }

                 return edlController;

         }

         public static EDLController createEDLController(EDocLiteAssociation edlAssociation, EDLGlobalConfig edlGlobalConfig, DocumentRouteHeaderValue document) {

                 EDLController edlController = createEDLController(edlAssociation, edlGlobalConfig);

                 try {

                         Document defaultDom = edlController.getDefaultDOM();

                         Document documentDom = XmlHelper.readXml(document.getDocContent());

                         // get the data node and import it into our default DOM

                         Element documentData = (Element) documentDom.getElementsByTagName(EDLXmlUtils.DATA_E).item(0);

                         if (documentData != null) {

                                 Element defaultDomEDL = EDLXmlUtils.getEDLContent(defaultDom, false);

                                 Element defaultDomData = (Element) defaultDomEDL.getElementsByTagName(EDLXmlUtils.DATA_E).item(0);

                                 defaultDomEDL.replaceChild(defaultDom.importNode(documentData, true), defaultDomData);

                         }

                         if (LOG.isDebugEnabled()) {

                                 LOG.debug("Created default Node from document id " + document.getRouteHeaderId() + " content " + XmlHelper.jotNode(defaultDom));

                         }

                 } catch (Exception e) {

                         throw new WorkflowRuntimeException("Problems creating controller for EDL " + edlAssociation.getEdlName() + " document " + document.getRouteHeaderId(), e);

                 }

                 return edlController;

         }

         private synchronized static void loadStyle(EDLController edlController) throws Exception {

                 EDocLiteService edlService = getEDLService();

                 Templates styleSheet = null;

                 styleSheet = edlService.getStyleAsTranslet(edlController.getEdocLiteAssociation().getStyle());

                 edlController.setStyle(styleSheet);

         }

         private synchronized static void loadPreProcessors(EDLController edlController, EDLGlobalConfig edlGlobalConfig) {

                 edlController.setPreProcessors(cloneConfigMap(edlGlobalConfig.getPreProcessors(), edlController.getDefaultDOM()));

         }

         private synchronized static void loadPostProcessor(EDLController edlController, EDLGlobalConfig edlGlobalConfig) {

                 edlController.setPostProcessors(cloneConfigMap(edlGlobalConfig.getPostProcessors(), edlController.getDefaultDOM()));

         }

         private synchronized static void loadStateComponents(EDLController edlController, EDLGlobalConfig edlGlobalConfig) {

                 edlController.setStateComponents(cloneConfigMap(edlGlobalConfig.getStateComponents(), edlController.getDefaultDOM()));

         }

         private synchronized static void loadConfigProcessors(EDLController edlController, EDLGlobalConfig edlGlobalConfig) throws Exception {

                 EDocLiteAssociation edlAssociation = edlController.getEdocLiteAssociation();

                 Map configProcessorMappings = fetchConfigFromCache(edlAssociation.getDefinition());

                 if (configProcessorMappings != null) {

                         edlController.setConfigProcessors(cloneConfigMap(configProcessorMappings, edlController.getDefaultDOM()));

                 } else {

                         // these are classes mapped to the conf element from the edlconfig.

                         Document document = getEDLService().getDefinitionXml(edlAssociation);

                         Element definitionElement = (Element) document.getFirstChild();

                         configProcessorMappings = new LinkedHashMap();

                         edlController.setEdlGlobalConfig(edlGlobalConfig);

                         NodeList edlDefinitionNodes = definitionElement.getChildNodes();

                         for (int i = 0; i < edlDefinitionNodes.getLength(); i++) {

                                 Node definitionNode = edlDefinitionNodes.item(i);

                                 Class configProcessorClass = edlGlobalConfig.getConfigProcessor(definitionNode);

                                 if (configProcessorClass != null) {

                                         configProcessorMappings.put(definitionNode, configProcessorClass);

                                 }

                         }

                         putConfigInCache(edlAssociation.getDefinition(), configProcessorMappings);

 //                        edlConfigCache.put(edlAssociation.getDefinition(), configProcessorMappings);

                         loadConfigProcessors(edlController, edlGlobalConfig);

                 }

         }

         protected synchronized static Map fetchConfigFromCache(String definition) {

                 return (Map)KEWServiceLocator.getCacheAdministrator().getFromCache(getConfigCacheKey(definition));

         }

         private synchronized static void putConfigInCache(String definition, Map configProcessorMappings) {

                 KEWServiceLocator.getCacheAdministrator().putInCache(getConfigCacheKey(definition), configProcessorMappings, CONFIG_CACHE_GROUP_NAME);

         }

         private static String getConfigCacheKey(String definition) {

                 return CONFIG_CACHE_GROUP_NAME + ":" + definition;

         }

         private synchronized static Map cloneConfigMap(Map configMap, Document defaultDom) {

                 Map tempConfigProcessors = new LinkedHashMap();

                 for (Iterator iter = configMap.entrySet().iterator(); iter.hasNext();) {

                         Map.Entry configProcessorMapping = (Map.Entry) iter.next();

                         tempConfigProcessors.put(defaultDom.importNode((Node)configProcessorMapping.getKey(), true), configProcessorMapping.getValue());

                 }

                 return tempConfigProcessors;

         }

         private static EDocLiteService getEDLService() {

                 return KEWServiceLocator.getEDocLiteService();

         }

         private static Document getDefaultDOM(EDocLiteAssociation edlAssociation) throws Exception {

                 Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();

                 Element rootElement = dom.createElement("documentContent"); // this is a

                 // throwback

                 // to some

                 // original

                 // madness

                 // to get EDL routing over a year ago we need to look into this being

                 // eliminated.

                 dom.appendChild(rootElement);

                 Element edlContentElement = EDLXmlUtils.getEDLContent(dom, true);

                 EDLXmlUtils.getDataFromEDLDocument(edlContentElement, true);

                 // get the data element that was just created ***jitrue***

                 Element edlData = EDLXmlUtils.getChildElement(edlContentElement, EDLXmlUtils.DATA_E);

                 // set edlName attribute on data element of default DOM ***jitrue***

                 edlData.setAttribute("edlName", edlAssociation.getEdlName());

                 return dom;

         }

         public static void flushDefinitionFromConfigCache(String definition) {

                 KEWServiceLocator.getCacheAdministrator().flushEntry(getConfigCacheKey(definition));

 //                edlConfigCache.remove(defName);

         }

         public static void flushDefinitionCache() {

                 KEWServiceLocator.getCacheAdministrator().flushGroup(CONFIG_CACHE_GROUP_NAME);

         }

 }