/*
    * 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.kuali.rice.kew.engine.RouteContext;
  import org.kuali.rice.kew.engine.node.JoinNode;
  import org.kuali.rice.kew.engine.node.ProcessResult;
  import org.kuali.rice.kew.engine.node.RouteNodeInstance;
  
  /**
   * Handles transitions to and from {@link JoinNode} nodes in the route path.
   * 
   * @see JoinNode
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class JoinTransitionEngine extends TransitionEngine {
  
      public RouteNodeInstance transitionTo(RouteNodeInstance nextNodeInstance, RouteContext context) {
          if (context.getNodeInstance().getBranch().getJoinNode() != null) {
              nextNodeInstance = context.getNodeInstance().getBranch().getJoinNode();
          } else{
              getRouteHelper().getJoinEngine().createExpectedJoinState(context, nextNodeInstance, context.getNodeInstance());
          }
          getRouteHelper().getJoinEngine().addActualJoiner(nextNodeInstance, context.getNodeInstance().getBranch());
          return nextNodeInstance;
      }
      
      public ProcessResult isComplete(RouteContext context) throws Exception {
          RouteNodeInstance nodeInstance = context.getNodeInstance();
  		JoinNode node = (JoinNode)getNode(nodeInstance.getRouteNode(), JoinNode.class);
  		return node.process(context, getRouteHelper());
      }
  
  }