/**

  * Copyright 2005-2011 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.transition;

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

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

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

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

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

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

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

 import org.kuali.rice.kew.api.exception.WorkflowException;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * Handles transitions into and out of {@link SubProcessNode} nodes.

  * 

  * @see SubProcessNode

  *

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

  */

 public class SubProcessTransitionEngine extends TransitionEngine {

     public RouteNodeInstance transitionTo(RouteNodeInstance nextNodeInstance, RouteContext context) throws Exception {

         String processName = nextNodeInstance.getRouteNode().getRouteNodeName();

         ProcessDefinitionBo process = context.getDocument().getDocumentType().getNamedProcess(processName);

         if (process == null) {

             throw new WorkflowException("Could not locate named sub process: " + processName);

         }

         RouteNodeInstance subProcessNodeInstance = nextNodeInstance;

         subProcessNodeInstance.setInitial(false);

         subProcessNodeInstance.setActive(false);

         nextNodeInstance = getRouteHelper().getNodeFactory().createRouteNodeInstance(subProcessNodeInstance.getDocumentId(), process.getInitialRouteNode());

         nextNodeInstance.setBranch(subProcessNodeInstance.getBranch());

         nextNodeInstance.setProcess(subProcessNodeInstance);

             return nextNodeInstance;

         }

         public ProcessResult isComplete(RouteContext context) throws Exception {

         throw new UnsupportedOperationException("isComplete() should not be invoked on a SubProcess!");

     }

     public Transition transitionFrom(RouteContext context, ProcessResult processResult) throws Exception {

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

         processInstance.setComplete(true);

                 SubProcessNode node = (SubProcessNode)getNode(processInstance.getRouteNode(), SubProcessNode.class);

                 SubProcessResult result = node.process(context);

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

                 if (result.isComplete()) {

                         List<RouteNode> nextNodes = processInstance.getRouteNode().getNextNodes();

             for (RouteNode nextNode : nextNodes)

             {

                 RouteNodeInstance nextNodeInstance = getRouteHelper().getNodeFactory().createRouteNodeInstance(processInstance.getDocumentId(), nextNode);

                 nextNodeInstance.setBranch(processInstance.getBranch());

                 nextNodeInstance.setProcess(processInstance.getProcess());

                 nextNodeInstances.add(nextNodeInstance);

             }

                 }

                 return new Transition(nextNodeInstances);

         }

 }