/*

  * 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.engine.node.hierarchyrouting;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.Collection;

 import java.util.HashMap;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Map;

 import javax.xml.XMLConstants;

 import javax.xml.namespace.QName;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.api.reflect.ObjectDefinition;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

 import org.kuali.rice.core.api.reflect.ObjectDefinition;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

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

 import org.kuali.rice.kew.doctype.bo.DocumentType;

 import org.kuali.rice.kew.engine.RouteContext;

 import org.kuali.rice.kew.engine.RouteHelper;

 import org.kuali.rice.kew.engine.node.Branch;

 import org.kuali.rice.kew.engine.node.DynamicNode;

 import org.kuali.rice.kew.engine.node.DynamicResult;

 import org.kuali.rice.kew.engine.node.NoOpNode;

 import org.kuali.rice.kew.engine.node.NodeState;

 import org.kuali.rice.kew.engine.node.Process;

 import org.kuali.rice.kew.engine.node.RequestsNode;

 import org.kuali.rice.kew.engine.node.RouteNode;

 import org.kuali.rice.kew.engine.node.RouteNodeInstance;

 import org.kuali.rice.kew.engine.node.SimpleJoinNode;

 import org.kuali.rice.kew.engine.node.SimpleSplitNode;

 import org.kuali.rice.kew.engine.node.hierarchyrouting.HierarchyProvider.Stop;

 import org.kuali.rice.kew.engine.transition.SplitTransitionEngine;

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

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

 /**

  * Generic hierarchy routing node

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

  */

 public class HierarchyRoutingNode implements DynamicNode {

     protected final Logger LOG = Logger.getLogger(getClass());

     /**

      * The RouteNode configuration parameter that specifies the hierarchy provider implementation

      */

     public static final String HIERARCHY_PROVIDER = "hierarchyProvider";

     /**

      * RouteNodeInstance NodeState key for id of stop

      */

     public static final String STOP_ID = "stop_id";

     protected static final String SPLIT_PROCESS_NAME = "Hierarchy Split";

     protected static final String JOIN_PROCESS_NAME = "Hierarchy Join";

     protected static final String REQUEST_PROCESS_NAME = "Hierarchy Request";

     protected static final String NO_STOP_NAME = "No stop";

     // constants for the process state in tracking stops we've traveled

     private static final String VISITED_STOPS = "visited_stops";

     private static final String V_STOPS_DEL = ",";

     private static final String INITIAL_SPLIT_NODE_MARKER = "InitialSplitNode";

     /**

      * Loads hierarchy provider class via the GlobalResourceLoader

      * @param nodeInstance the current RouteNodeInstance

      * @param context the current RouteContext

      * @return the HierarchyProvider implementation, as specified by the HIERARCHY_PROVIDER config parameter

      */

     protected HierarchyProvider getHierarchyProvider(RouteNodeInstance nodeInstance, RouteContext context) {

         Map<String, String> cfgMap = Utilities.getKeyValueCollectionAsMap(nodeInstance.getRouteNode().getConfigParams());

         String hierarchyProviderClass = cfgMap.get(HIERARCHY_PROVIDER); 

         if (StringUtils.isEmpty(hierarchyProviderClass)) {

             throw new WorkflowRuntimeException("hierarchyProvider configuration parameter not set for HierarchyRoutingNode: " + nodeInstance.getName());

         }

         QName qn = QName.valueOf(hierarchyProviderClass);

         ObjectDefinition od;

         if (XMLConstants.NULL_NS_URI.equals(qn.getNamespaceURI())) {

             od = new ObjectDefinition(qn.getLocalPart());

         } else {

             od = new ObjectDefinition(qn.getLocalPart(), qn.getNamespaceURI());

         }

         HierarchyProvider hp = (HierarchyProvider) GlobalResourceLoader.getObject(od);

         hp.init(nodeInstance, context);

         return hp;

     }

     public DynamicResult transitioningInto(RouteContext context, RouteNodeInstance dynamicNodeInstance, RouteHelper helper) throws Exception {

         HierarchyProvider provider = getHierarchyProvider(dynamicNodeInstance, context);

         DocumentType documentType = setUpDocumentType(provider, context.getDocument().getDocumentType(), dynamicNodeInstance);

         RouteNode splitNode = documentType.getNamedProcess(SPLIT_PROCESS_NAME).getInitialRouteNode();

         //set up initial SplitNodeInstance

         RouteNodeInstance splitNodeInstance = helper.getNodeFactory().createRouteNodeInstance(context.getDocument().getDocumentId(), splitNode);

         splitNodeInstance.setBranch(dynamicNodeInstance.getBranch());

         markAsInitialSplitNode(splitNodeInstance);

         int i = 0;

         List<Stop> stops = provider.getLeafStops(context);

         if (stops.isEmpty()) {

             // if we have no stops, then just return a no-op node with IU-UNIV attached, this will terminate the process

             RouteNode noStopNode = documentType.getNamedProcess(NO_STOP_NAME).getInitialRouteNode();

             RouteNodeInstance noChartOrgInstance = helper.getNodeFactory().createRouteNodeInstance(context.getDocument().getDocumentId(), noStopNode);

             noChartOrgInstance.setBranch(dynamicNodeInstance.getBranch());

             provider.setStop(noChartOrgInstance, null);

             return new DynamicResult(true, noChartOrgInstance);

         }

         for (Stop stop: stops) {

             RouteNode requestNode = getStopRequestNode(stop, documentType);

             createInitialRequestNodeInstance(provider, stop, splitNodeInstance, dynamicNodeInstance, requestNode);

         }

         return new DynamicResult(false, splitNodeInstance);

     }

     public DynamicResult transitioningOutOf(RouteContext context, RouteHelper helper) throws Exception {

         // process initial nodes govern transitioning within the process

         // the process node will be the hierarchy node, so that's what we need to grab

         HierarchyProvider provider = getHierarchyProvider(context.getNodeInstance().getProcess(), context);

         RouteNodeInstance processInstance = context.getNodeInstance().getProcess();

         RouteNodeInstance curStopNode = context.getNodeInstance();

         Map<String, RouteNodeInstance> stopRequestNodeMap = new HashMap<String, RouteNodeInstance>();

         findStopRequestNodes(provider, context, stopRequestNodeMap);//SpringServiceLocator.getRouteNodeService().findProcessNodeInstances(processInstance);

         Stop stop = provider.getStop(curStopNode);

         if (provider.isRoot(stop)) {

             return new DynamicResult(true, null);

         }        

         //create a join node for the next node and attach any sibling orgs to the join

         //if no join node is necessary i.e. no siblings create a requests node

         InnerTransitionResult transition = canTransitionFrom(provider, stop, stopRequestNodeMap.values(), helper);

         DynamicResult result = null;

         if (transition.isCanTransition()) {

             DocumentType documentType = context.getDocument().getDocumentType();

             // make a simple requests node

             RouteNodeInstance requestNode = createNextStopRequestNodeInstance(provider, context, stop, processInstance, helper);

             if (transition.getSiblings().isEmpty()) {

                 result = new DynamicResult(false, requestNode);

             } else {

                 /* join stuff not working

                 //create a join to transition us to the next org

                 RouteNode joinPrototype = documentType.getNamedProcess(JOIN_PROCESS_NAME).getInitialRouteNode();

                 RouteNodeInstance joinNode = helper.getNodeFactory().createRouteNodeInstance(context.getDocument().getDocumentId(), joinPrototype);

                 LOG.debug("Created join node: " + joinNode);

                 String branchName = "Branch for join " + provider.getStopIdentifier(stop);

                 Branch joinBranch = helper.getNodeFactory().createBranch(branchName, null, joinNode);

                 LOG.debug("Created branch for join node: " + joinBranch);

                 joinNode.setBranch(joinBranch);

                 for (RouteNodeInstance sibling: transition.getSiblings()) {

                     LOG.debug("Adding expected joiner: " + sibling.getRouteNodeInstanceId() + " " + provider.getStop(sibling));

                     helper.getJoinEngine().addExpectedJoiner(joinNode, sibling.getBranch());

                 }

                 ///XXX: can't get stop from node that hasn't been saved yet maybe...need to follow up on this...comes back as 'root'

                 LOG.debug("Adding as stop after join: " + requestNode.getRouteNodeInstanceId() + " " + provider.getStop(requestNode));

                 //set the next org after the join

                 joinNode.addNextNodeInstance(requestNode);

                 result = new DynamicResult(false, joinNode);

                 */

             }

         } else {

             result = new DynamicResult(false, null);

         }

         result.getNextNodeInstances().addAll(getNewlyAddedOrgRouteInstances(provider, context, helper));

         return result;

     }

     private void findStopRequestNodes(HierarchyProvider provider, RouteContext context, Map<String, RouteNodeInstance> stopRequestNodes) {

         List<RouteNodeInstance> nodeInstances = KEWServiceLocator.getRouteNodeService().getFlattenedNodeInstances(context.getDocument(), true);

         for (RouteNodeInstance nodeInstance: nodeInstances) {

             if (provider.hasStop(nodeInstance)) {

                 LOG.debug("Stop node instance: " + nodeInstance);

                 stopRequestNodes.put(nodeInstance.getRouteNodeInstanceId(), nodeInstance);

             }

         }

     }

     private RouteNodeInstance createNextStopRequestNodeInstance(HierarchyProvider provider, RouteContext context, Stop stop, RouteNodeInstance processInstance, RouteHelper helper) {

         Stop futureStop = provider.getParent(stop);

         LOG.debug("Creating next stop request node instance " + provider.getStopIdentifier(futureStop) + " as parent of " + provider.getStopIdentifier(stop));

         RouteNode requestsPrototype = getStopRequestNode(futureStop, context.getDocument().getDocumentType());

         RouteNodeInstance requestNode = helper.getNodeFactory().createRouteNodeInstance(context.getDocument().getDocumentId(), requestsPrototype);

         requestNode.setBranch(processInstance.getBranch());

         NodeState ns = new NodeState();

         ns.setKey(STOP_ID);

         ns.setValue(provider.getStopIdentifier(futureStop));

         requestNode.addNodeState(ns);

         provider.setStop(requestNode, futureStop);

         LOG.debug("Stop set on request node: " + provider.getStop(requestNode));

         addStopToProcessState(provider, processInstance, futureStop);

         return requestNode;

     }

     /**

      * i can only transition from this if all the nodes left are completed immediate siblings

      * 

      * @param org

      * @param requestNodes

      * @return List of Nodes that are siblings to the org passed in

      */

     private InnerTransitionResult canTransitionFrom(HierarchyProvider provider, Stop currentStop, Collection<RouteNodeInstance> requestNodes, RouteHelper helper) {

         LOG.debug("Testing whether we can transition from stop: " + currentStop);

         Stop parent = provider.getParent(currentStop);

         InnerTransitionResult result = new InnerTransitionResult();

         result.setCanTransition(false);

         for (RouteNodeInstance requestNode: requestNodes) {

             if (!provider.hasStop(requestNode)) {

                 LOG.debug("request node " + requestNode.getName() + " does not have a stop associated with it");

                 continue;

             }

             Stop requestNodeStop = provider.getStop(requestNode);

             LOG.debug("Request node: " + requestNode.getRouteNodeInstanceId() + " has stop " + requestNodeStop.toString());

             if (requestNodeStop != null && provider.equals(currentStop, requestNodeStop)) {

                 LOG.debug("Skipping node " + requestNode.getName() + " because it is associated with the current stop");

                 continue;

             }

             Stop stop = provider.getStop(requestNode);

             LOG.debug("Found an outstanding stop: " + stop);

             boolean isChildOfMyParent = isDescendent(provider, parent, stop);

             if (isChildOfMyParent) {

                 LOG.debug("Found stop node whose parent is my parent:");

                 LOG.debug("Stop: " + stop);

                 LOG.debug("Node: " + requestNode);

                 // if any sibling request node is active, then I can't transition

                 if (requestNode.isActive()) {

                     // can't transition

                     result.getSiblings().clear();

                     return result;

                 }

                 /* join stuff not working

                 // if it's a direct sibling

                 if (provider.equals(parent, provider.getParent(stop))) {

                     LOG.debug("Adding stop " + provider.getStopIdentifier(stop) + " as sibling to " + provider.getStopIdentifier(currentStop));

                     result.getSiblings().add(requestNode);

                 }

                 */

             }

         }

         result.setCanTransition(true);

         return result;

     }

     protected boolean isDescendent(HierarchyProvider provider, Stop parent, Stop otherStop) {

         return provider.isRoot(parent) || hasAsParent(provider, parent, otherStop);

     }

     private static class InnerTransitionResult {

         private boolean canTransition;

         private List<RouteNodeInstance> siblings = new ArrayList<RouteNodeInstance>();

         public boolean isCanTransition() {

             return canTransition;

         }

         public void setCanTransition(boolean canTransition) {

             this.canTransition = canTransition;

         }

         public List<RouteNodeInstance> getSiblings() {

             return siblings;

         }

         public void setSiblings(List<RouteNodeInstance> siblings) {

             this.siblings = siblings;

         }

     }

     private static void markAsInitialSplitNode(RouteNodeInstance splitNode) {

         NodeState ns = new NodeState();

         ns.setKey(INITIAL_SPLIT_NODE_MARKER);

         ns.setValue(INITIAL_SPLIT_NODE_MARKER);

             splitNode.addNodeState(ns);

     }

     /**

      * @param routeNodeInstance

      * @return

      */

     private static boolean isInitialSplitNode(RouteNodeInstance routeNodeInstance) {

         return routeNodeInstance.getNodeState(INITIAL_SPLIT_NODE_MARKER) != null;

     }

     /**

      * Adds the org to the process state 

      * @param processInstance

      * @param org

      */

     private void addStopToProcessState(HierarchyProvider provider, RouteNodeInstance processInstance, Stop stop) {

         String stopStateName = provider.getStopIdentifier(stop);

         NodeState visitedStopsState = processInstance.getNodeState(VISITED_STOPS);

         if (visitedStopsState == null) {

             NodeState ns = new NodeState();

             ns.setKey(VISITED_STOPS);

             ns.setValue(stopStateName + V_STOPS_DEL);

                 processInstance.addNodeState(ns);

         } else if (! getVisitedStopsList(processInstance).contains(stopStateName)) {

             visitedStopsState.setValue(visitedStopsState.getValue() + stopStateName + V_STOPS_DEL);

         }

     }

     /**

      * @param process

      * @return List of stop strings on the process state

      */

     private static List<String> getVisitedStopsList(RouteNodeInstance process) {

         return Arrays.asList(process.getNodeState(VISITED_STOPS).getValue().split(V_STOPS_DEL));

     }

     /**

      * Determines if the org has been routed to or will be.

      * @param stop

      * @param process

      * @return boolean if this is an org we would not hit in routing

      */

     private boolean isNewStop(HierarchyProvider provider, Stop stop, RouteNodeInstance process) {

         String orgStateName = provider.getStopIdentifier(stop);

         List<String> visitedOrgs = getVisitedStopsList(process);

         boolean isInVisitedList = visitedOrgs.contains(orgStateName);

         if (isInVisitedList) {

             return false;

         }

         boolean willEventualRouteThere = false;

         //determine if we will eventually route to this chart anyway

         for (Iterator<String> iter = visitedOrgs.iterator(); iter.hasNext() && willEventualRouteThere == false; ) {

             String visitedStopStateName = iter.next();

             Stop visitedStop = provider.getStopByIdentifier(visitedStopStateName);

             willEventualRouteThere = hasAsParent(provider, stop, visitedStop) || willEventualRouteThere;

         }

         return ! willEventualRouteThere;

     }

     /**

      * Creates a Org Request RouteNodeInstance that is a child of the passed in split.  This is used to create the initial 

      * request RouteNodeInstances off the begining split.

      * @param org

      * @param splitNodeInstance

      * @param processInstance

      * @param requestsNode

      * @return Request RouteNodeInstance bound to the passed in split as a 'nextNodeInstance'

      */

     private RouteNodeInstance createInitialRequestNodeInstance(HierarchyProvider provider, Stop stop, RouteNodeInstance splitNodeInstance, RouteNodeInstance processInstance, RouteNode requestsNode) {

         String branchName = "Branch " + provider.getStopIdentifier(stop);

         RouteNodeInstance orgRequestInstance = SplitTransitionEngine.createSplitChild(branchName, requestsNode, splitNodeInstance);

         splitNodeInstance.addNextNodeInstance(orgRequestInstance);

         NodeState ns = new NodeState();

         ns.setKey(STOP_ID);

         ns.setValue(provider.getStopIdentifier(stop));

         orgRequestInstance.addNodeState(ns);

         provider.setStop(orgRequestInstance, stop);

         addStopToProcessState(provider, processInstance, stop);

         return orgRequestInstance;

     }

     /**

      * Check the xml and determine there are any orgs declared that we will not travel through on our current trajectory.

      * @param context

      * @param helper

      * @return RouteNodeInstances for any orgs we would not have traveled through that are now in the xml.

      * @throws Exception

      */

     private List<RouteNodeInstance> getNewlyAddedOrgRouteInstances(HierarchyProvider provider, RouteContext context, RouteHelper helper) throws Exception {

         RouteNodeInstance processInstance = context.getNodeInstance().getProcess();

         RouteNodeInstance chartOrgNode = context.getNodeInstance();

         //check for new stops in the xml

         List<Stop> stops = provider.getLeafStops(context);

         List<RouteNodeInstance> newStopsRoutingTo = new ArrayList<RouteNodeInstance>();

         for (Stop stop: stops) {

             if (isNewStop(provider, stop, processInstance)) {

                 //the idea here is to always use the object referenced by the engine so simulation can occur

                 List<RouteNodeInstance> processNodes = chartOrgNode.getPreviousNodeInstances();

                 for (RouteNodeInstance splitNodeInstance: processNodes) {

                     if (isInitialSplitNode(splitNodeInstance)) {                        

                         RouteNode requestsNode = getStopRequestNode(stop, context.getDocument().getDocumentType());

                         RouteNodeInstance newOrgRequestNode = createInitialRequestNodeInstance(provider, stop, splitNodeInstance, processInstance, requestsNode);

                         newStopsRoutingTo.add(newOrgRequestNode);

                     }

                 }

             }

         }

         return newStopsRoutingTo;

     }    

     /**

      * @param parent

      * @param child

      * @return true - if child or one of it's eventual parents reports to parent false - if child or one of it's eventual parents does not report to parent

      */

     private boolean hasAsParent(HierarchyProvider provider, Stop parent, Stop child) {

         if (provider.isRoot(child)) {

             return false;

         } else if (provider.equals(parent, child)) {

             return true;

         } else {

             child = provider.getParent(child);

             return hasAsParent(provider, parent, child);

         }

     }

     /**

      * Make the 'floating' split, join and request RouteNodes that will be independent processes. These are the prototypes from which our RouteNodeInstance will belong

      * 

      * @param documentType

      * @param dynamicNodeInstance

      */

     private DocumentType setUpDocumentType(HierarchyProvider provider, DocumentType documentType, RouteNodeInstance dynamicNodeInstance) {

         boolean altered = false;

         if (documentType.getNamedProcess(SPLIT_PROCESS_NAME) == null) {

             RouteNode splitNode = getSplitNode(dynamicNodeInstance);

             documentType.addProcess(getPrototypeProcess(splitNode, documentType));

             altered = true;

         }

         if (documentType.getNamedProcess(JOIN_PROCESS_NAME) == null) {

             RouteNode joinNode = getJoinNode(dynamicNodeInstance);

             documentType.addProcess(getPrototypeProcess(joinNode, documentType));

             altered = true;

         }

         if (documentType.getNamedProcess(REQUEST_PROCESS_NAME) == null) {

             RouteNode requestsNode = getRequestNode(provider, dynamicNodeInstance);

             documentType.addProcess(getPrototypeProcess(requestsNode, documentType));

             altered = true;

         }

         if (documentType.getNamedProcess(NO_STOP_NAME) == null) {

             RouteNode noChartOrgNode = getNoChartOrgNode(dynamicNodeInstance);

             documentType.addProcess(getPrototypeProcess(noChartOrgNode, documentType));

             altered = true;

         }

         if (altered) {

                 //side step normal version etc. because it's a pain.

             KEWServiceLocator.getDocumentTypeService().save(documentType);

         }

         return KEWServiceLocator.getDocumentTypeService().findByName(documentType.getName());

     }

     /**

      * Places a Process on the documentType wrapping the node and setting the node as the process's initalRouteNode

      * 

      * @param node

      * @param documentType

      * @return Process wrapping the node passed in

      */

     protected Process getPrototypeProcess(RouteNode node, DocumentType documentType) {

         Process process = new Process();

         process.setDocumentType(documentType);

         process.setInitial(false);

         process.setInitialRouteNode(node);

         process.setName(node.getRouteNodeName());

         return process;

     }

     /**

      * @param process

      * @return Route Node of the JoinNode that will be prototype for the split RouteNodeInstances generated by this component

      */

     private static RouteNode getSplitNode(RouteNodeInstance process) {

         RouteNode dynamicNode = process.getRouteNode();

         RouteNode splitNode = new RouteNode();

         splitNode.setActivationType(dynamicNode.getActivationType());

         splitNode.setDocumentType(dynamicNode.getDocumentType());

         splitNode.setFinalApprovalInd(dynamicNode.getFinalApprovalInd());

         splitNode.setExceptionWorkgroupId(dynamicNode.getExceptionWorkgroupId());

         splitNode.setMandatoryRouteInd(dynamicNode.getMandatoryRouteInd());

         splitNode.setNodeType(SimpleSplitNode.class.getName());

         splitNode.setRouteMethodCode("FR");

         splitNode.setRouteMethodName(null);

         splitNode.setRouteNodeName(SPLIT_PROCESS_NAME);

         return splitNode;

         //SubRequests

     }

     /**

      * @param process

      * @return Route Node of the JoinNode that will be prototype for the join RouteNodeInstances generated by this component

      */

     private static RouteNode getJoinNode(RouteNodeInstance process) {

         RouteNode dynamicNode = process.getRouteNode();

         RouteNode joinNode = new RouteNode();

         joinNode.setActivationType(dynamicNode.getActivationType());

         joinNode.setDocumentType(dynamicNode.getDocumentType());

         joinNode.setFinalApprovalInd(dynamicNode.getFinalApprovalInd());

         joinNode.setExceptionWorkgroupId(dynamicNode.getExceptionWorkgroupId());

         joinNode.setMandatoryRouteInd(dynamicNode.getMandatoryRouteInd());

         joinNode.setNodeType(SimpleJoinNode.class.getName());

         joinNode.setRouteMethodCode("FR");

         joinNode.setRouteMethodName(null);

         joinNode.setRouteNodeName(JOIN_PROCESS_NAME);

         return joinNode;

     }

     /**

      * @param process

      * @return RouteNode of RequestsNode that will be prototype for RouteNodeInstances having requets that are generated by this component

      */

     private RouteNode getRequestNode(HierarchyProvider provider, RouteNodeInstance process) {

         RouteNode dynamicNode = process.getRouteNode();

         RouteNode requestsNode = new RouteNode();

         requestsNode.setActivationType(dynamicNode.getActivationType());

         requestsNode.setDocumentType(dynamicNode.getDocumentType());

         requestsNode.setFinalApprovalInd(dynamicNode.getFinalApprovalInd());

         requestsNode.setExceptionWorkgroupId(dynamicNode.getExceptionWorkgroupId());

         requestsNode.setMandatoryRouteInd(dynamicNode.getMandatoryRouteInd());

         requestsNode.setNodeType(RequestsNode.class.getName());

         requestsNode.setRouteMethodCode("FR");

         requestsNode.setRouteMethodName(process.getRouteNode().getRouteMethodName());

         requestsNode.setRouteNodeName(REQUEST_PROCESS_NAME);

         provider.configureRequestNode(process, requestsNode);

         return requestsNode;

     }

     /**

      * @param process

      * @return RouteNode of a no-op node which will be used if the user sends no Chart+Org XML to this routing component.

      */

     private static RouteNode getNoChartOrgNode(RouteNodeInstance process) {

         RouteNode dynamicNode = process.getRouteNode();

         RouteNode noChartOrgNOde = new RouteNode();

         noChartOrgNOde.setActivationType(dynamicNode.getActivationType());

         noChartOrgNOde.setDocumentType(dynamicNode.getDocumentType());

         noChartOrgNOde.setFinalApprovalInd(dynamicNode.getFinalApprovalInd());

         noChartOrgNOde.setExceptionWorkgroupId(dynamicNode.getExceptionWorkgroupId());

         noChartOrgNOde.setMandatoryRouteInd(dynamicNode.getMandatoryRouteInd());

         noChartOrgNOde.setNodeType(NoOpNode.class.getName());

         noChartOrgNOde.setRouteMethodCode("FR");

         noChartOrgNOde.setRouteMethodName(null);

         noChartOrgNOde.setRouteNodeName(NO_STOP_NAME);

         return noChartOrgNOde;

     }

     // methods which can be overridden to change the chart org routing node behavior

     protected RouteNode getStopRequestNode(Stop stop, DocumentType documentType) {

         return documentType.getNamedProcess(REQUEST_PROCESS_NAME).getInitialRouteNode();

     }

 }