/*

  * Copyright 2005-2008 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.jdom.Document;

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

 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.SimpleResult;

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

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

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

 import java.io.StringReader;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * TransitionEngine responsible for returning the workflow engine to another RouteNode

  * 

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

  */

 public class LoopTransitionEngine extends TransitionEngine {

         @Override

         public ProcessResult isComplete(RouteContext context) throws Exception {

                 return new SimpleResult(true);

         }

     /**

      * Determines the next nodes instances for the transition.  If the node instance already

      * has next nodes instances (i.e. a dynamic node), then those will be returned.  Otherwise

      * it will resolve the next nodes from the RouteNode prototype.

      */

     protected List<RouteNodeInstance> resolveNextNodeInstances(RouteNodeInstance nodeInstance, List<RouteNode> nextRouteNodes) {

             try {

                         Document doc = XmlHelper.buildJDocument(new StringReader(nodeInstance.getRouteNode().getContentFragment()));

                 } catch (InvalidXmlException e) {

                         throw new WorkflowRuntimeException(e);

                 }

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

         for (RouteNode nextRouteNode : nextRouteNodes)

         {

             RouteNodeInstance nextNodeInstance = getRouteHelper().getNodeFactory().createRouteNodeInstance(nodeInstance.getDocumentId(), nextRouteNode);

             nextNodeInstance.setBranch(nodeInstance.getBranch());

             nextNodeInstance.setProcess(nodeInstance.getProcess());

             nextNodeInstances.add(nextNodeInstance);

         }

         return nextNodeInstances;

     }

 }