/// <summary>
/// Gets a list of <see cref="ValidationFailureDescription"/>s describing all validation failures.
/// </summary>
/// <remarks>
/// When an empty list is returned, it means there were no validation failures.
/// </remarks>
internal ReadOnlyCollection <ValidationFailureDescription> GetValidationFailures(SeriesData originalData, SeriesData anonymizedData)
{
_failures = new List <ValidationFailureDescription>();
ReadOnlyCollection <ValidationFailureDescription> failures = _failures.AsReadOnly();
//nothing to validate for now.
_failures = null;
return(failures);
}