public static ProcessInstanceRef processInstance(ProcessInstanceLog processInstance) {
   ProcessInstanceRef result =
       new ProcessInstanceRef(
           processInstance.getProcessInstanceId() + "",
           processInstance.getProcessId(),
           processInstance.getStart(),
           processInstance.getEnd(),
           false);
   TokenReference token =
       new TokenReference(processInstance.getProcessInstanceId() + "", null, "");
   result.setRootToken(token);
   return result;
 }