protected String calculateEventClass(EvaluationContextImpl context, LocatableEvent event) throws EvaluateException {
    String className = null;
    final ObjectReference thisObject = (ObjectReference)context.computeThisObject();
    if (thisObject != null) {
      className = thisObject.referenceType().name();
    }
    else {
      final StackFrameProxyImpl frame = context.getFrameProxy();
      if (frame != null) {
        className = frame.location().declaringType().name();
      }
    }
    return className;
  }
protected String calculateEventClass(EvaluationContextImpl context, LocatableEvent event)