code: static void incrementNegationCount(final EvaluationContext context, int adjustment)
     {
        if (context == null)
           return;
  
        Integer count = Conditions.getNegationCount(context);
        count += adjustment;
        context.put(NEGATION_COUNT_KEY, count);
     }
docs: This increments the number of negations, allowing us to determine (during evaluation) whether the results of a particular
  {@link Condition} will be negated.