/**
  * Validates a news start/end/archive date for a correct logical order.
  *
  *
  * @param class_model $objObject - the model object to the given form
  * @return bool
  */
 public function validateObject(class_model $objObject)
 {
     $objLang = class_carrier::getInstance()->getObjLang();
     $strModuleName = $objObject->getArrModule("modul");
     if ($objObject instanceof class_module_news_news) {
         //validate: $objStartDate < $objSpecialDate < $objEndDate
         $objStartDate = $objObject->getObjStartDate();
         $objEndDate = $objObject->getObjEndDate();
         $objSpecialDate = $objObject->getObjSpecialDate();
         $strLabelStartDate = $objLang->getLang("form_" . $objObject->getArrModule("modul") . "_datestart", $strModuleName);
         $strLabelEndDate = $objLang->getLang("form_" . $objObject->getArrModule("modul") . "_dateend", $strModuleName);
         $strLabelSpecialDate = $objLang->getLang("form_" . $objObject->getArrModule("modul") . "_datespecial", $strModuleName);
         if ($objStartDate != null && $objEndDate != null) {
             if (class_objectvalidator_helper::compareDates($objStartDate, $objEndDate) === 1) {
                 $this->addValidationError("startdate", $objLang->getLang("commons_object_validator_datecompare_validationmessage_before", $strModuleName, array($strLabelStartDate, $strLabelEndDate)));
             }
         }
         if ($objSpecialDate != null && $objEndDate != null) {
             if (class_objectvalidator_helper::compareDates($objSpecialDate, $objEndDate) === 1) {
                 $this->addValidationError("startdate", $objLang->getLang("commons_object_validator_datecompare_validationmessage_before", $strModuleName, array($strLabelSpecialDate, $strLabelEndDate)));
             }
         }
         if ($objStartDate != null && $objSpecialDate != null) {
             if (class_objectvalidator_helper::compareDates($objStartDate, $objSpecialDate) === 1) {
                 $this->addValidationError("startdate", $objLang->getLang("commons_object_validator_datecompare_validationmessage_before", $strModuleName, array($strLabelStartDate, $strLabelSpecialDate)));
             }
         }
     } else {
         return false;
     }
     return count($this->getArrValidationMessages()) == 0;
 }