public void ProcessFromFile(string filePath)
{
if (string.IsNullOrWhiteSpace(filePath))
{
throw new ArgumentNullException(nameof(filePath));
}
if (!_fileSystem.FileExists(filePath))
{
throw new FileNotFoundException("Cannot start process. Unable to locate file.", filePath);
}
var container = _deserialiser.Deserialise <Container>(filePath);
_parcelProcessor.Process(container);
}
