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package com.vci.server.workflow.server.event;
 
import org.jbpm.api.TaskService;
import org.jbpm.api.cmd.Environment;
import org.jbpm.api.task.Task;
import org.jbpm.pvm.internal.cmd.AbstractCommand;
import org.jbpm.pvm.internal.env.EnvironmentFactory;
import org.jbpm.pvm.internal.env.EnvironmentImpl;
import org.jbpm.pvm.internal.model.ActivityImpl;
import org.jbpm.pvm.internal.model.ExecutionImpl;
import org.jbpm.pvm.internal.model.TransitionImpl;
import org.jbpm.pvm.internal.task.TaskImpl;
 
public class RegectTaskSingleBackWayCmd extends AbstractCommand<String>{   
    
      private static final long serialVersionUID = 3407992369612709993L;   
      
       private String taskId;   
          
       public RegectTaskSingleBackWayCmd(String taskId) {   
          super();   
         this.taskId = taskId;   
      }   
     
   public String execute(Environment env) throws Exception {   
          TaskService taskService = env.get(TaskService.class);   
           TaskImpl currentTask = (TaskImpl)taskService.getTask(taskId);   
           ExecutionImpl exec = currentTask.getProcessInstance();   
         //获取当前任务的活动节点   
      ActivityImpl currentActivity = exec.getActivity();   
      //获取该活动节点的IncomingTransition   
         TransitionImpl incomingTransition = (TransitionImpl)currentActivity.getIncomingTransitions().get(0);   
     //获取IncomingTransition的源活动节点   
      ActivityImpl sourceActivity = incomingTransition.getSource();   
       
          TransitionImpl backTransition = currentActivity.createOutgoingTransition();   
             
           //当前活动节点为新的回退Transition的源，而原来的“源”活动节点变成了目标活动节点   
           backTransition.setSource(currentActivity);   
           backTransition.setDestination(sourceActivity);   
            backTransition.setName("regect "+incomingTransition.getName());   
            taskService.completeTask(taskId,backTransition.getName());   
            return sourceActivity.getName();   
       }
   
    }