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package org.activiti.engine.impl.agenda;

import org.activiti.bpmn.model.BoundaryEvent;
import org.activiti.bpmn.model.FlowElement;
import org.activiti.bpmn.model.FlowNode;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.impl.delegate.ActivityBehavior;
import org.activiti.engine.impl.delegate.TriggerableActivityBehavior;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;

/**
 * Operation that triggers a wait state and continues the process, leaving that activity.
 * 
 * The {@link ExecutionEntity} for this operations should be in a wait state (receive task for example)
 * and have a {@link FlowElement} that has a behaviour that implements the {@link TriggerableActivityBehavior}.
 * 

 */
public class TriggerExecutionOperation extends AbstractOperation {

  public TriggerExecutionOperation(CommandContext commandContext, ExecutionEntity execution) {
    super(commandContext, execution);
  }

  @Override
  public void run() {
    FlowElement currentFlowElement = getCurrentFlowElement(execution);
    if (currentFlowElement instanceof FlowNode) {
      
      ActivityBehavior activityBehavior = (ActivityBehavior) ((FlowNode) currentFlowElement).getBehavior();
      if (activityBehavior instanceof TriggerableActivityBehavior) {
        
        if (currentFlowElement instanceof BoundaryEvent) {
          commandContext.getHistoryManager().recordActivityStart(execution);
        }
        
        ((TriggerableActivityBehavior) activityBehavior).trigger(execution, null, null);
        
        if (currentFlowElement instanceof BoundaryEvent) {
          commandContext.getHistoryManager().recordActivityEnd(execution, null);
        }
        
      } else {
        throw new ActivitiException("Invalid behavior: " + activityBehavior + " should implement " + TriggerableActivityBehavior.class.getName());
      }

    } else {
      throw new ActivitiException("Programmatic error: no current flow element found or invalid type: " + currentFlowElement + ". Halting.");
    }
  }

}