boolean isSingleWindowStandardOffset(){
  return windowEnd.equals(LocalDateTime.MAX) && timeDefinition == TimeDefinition.WALL && fixedSavingAmountSecs == null && lastRuleList.isEmpty() && ruleList.isEmpty();
}

boolean isSingleWindowStandardOffset ( ) { return windowEnd . equals ( LocalDateTime . MAX ) && timeDefinition == TimeDefinition . WALL && fixedSavingAmountSecs == null && lastRuleList . isEmpty ( ) && ruleList . isEmpty ( ) ; }
checks if the window is empty .
