/// <summary>
/// Tries to produce a numeric key.
/// </summary>
/// <param name="id">The raw ID to use (without any check digit).</param>
/// <returns>The numeric key value (0 if a numeric key cannot be generated).</returns>
internal uint GetNumericKey(uint id)
{
// If a check digit is required, and the raw ID exceeds 200
// million, it means that the numeric key wouldn't fit in
// a 32-bit value.
if (HasCheckDigit && id > 200000000)
{
return(0);
}
// If the key format is not completely numeric, we can't do it.
if (!IsNumericKey())
{
return(0);
}
// If a check digit is not required, the supplied raw ID is
// the numeric key we want to store.
if (!HasCheckDigit)
{
return(id);
}
// Work out the check digit and append it to the raw ID.
uint checkdig = NativeId.GetCheckDigit(id);
return(id * 10 + checkdig);
}
/// <summary>
/// Formats an ID number the way this ID group likes to see it.
/// </summary>
/// <param name="id">The raw ID to format (may not actually lie within the
/// limits of this packet).</param>
/// <returns>The formatted result.</returns>
internal string FormatId(uint id)
{
// Apply the format assuming no check digit.
string key = String.Format(KeyFormat, id);
// If there really is a check digit, work it out and append it.
if (HasCheckDigit)
{
uint cd = NativeId.GetCheckDigit(id);
key += cd.ToString();
}
return(key);
}