/**
  * Validates & completes the given field mapping.
  *
  * @param array $mapping  The field mapping to validated & complete.
  * @return array  The validated and completed field mapping.
  * 
  * @throws MappingException
  */
 protected function _validateAndCompleteFieldMapping(array &$mapping)
 {
     parent::_validateAndCompleteFieldMapping($mapping);
     // Store ReflectionProperty of mapped field
     $refProp = $this->reflClass->getProperty($mapping['fieldName']);
     $refProp->setAccessible(true);
     $this->reflFields[$mapping['fieldName']] = $refProp;
 }