public string CreateUniqueRandomVersionOfPrn(PrnAsComponents prnAsComponents)
{
int firstLetterOrdinal = prnAsComponents.FirstLetter.GetOrdinalValue();
int secondLetterOrdinal = prnAsComponents.SecondLetter.GetOrdinalValue();
int thirdLetterOrdinal = prnAsComponents.ThirdLetter.GetOrdinalValue();
int fourthLetterOrdinal = prnAsComponents.FourthLetter.GetOrdinalValue();
// use quadratic residue to get a nice unique pseudorandomised version
int randomisedNumber = quadraticResidueHelper.ForFourDigitNumber(prnAsComponents.Number);
char randomisedFirstLetter = (char)(quadraticResidueHelper.ForSmallSubsetOfLetters(firstLetterOrdinal) + prnAsComponents.FirstLetter.BaseChar);
char randomisedSecondLetter = (char)(quadraticResidueHelper.ForSmallSubsetOfLetters(secondLetterOrdinal) + prnAsComponents.SecondLetter.BaseChar);
char randomisedThirdLetter = (char)(quadraticResidueHelper.ForSmallSubsetOfLetters(thirdLetterOrdinal) + prnAsComponents.ThirdLetter.BaseChar);
char randomisedFourthLetter = (char)(quadraticResidueHelper.ForSmallSubsetOfLetters(fourthLetterOrdinal) + prnAsComponents.FourthLetter.BaseChar);
// there's a few characters we want to skip to avoid confusion with numbers
if (randomisedFirstLetter >= 'O')
{
randomisedFirstLetter++;
}
if (randomisedSecondLetter >= 'O')
{
randomisedSecondLetter++;
}
if (randomisedThirdLetter >= 'I')
{
randomisedThirdLetter++;
}
if (randomisedFourthLetter >= 'I')
{
randomisedFourthLetter++;
}
// all done, toss the pseudorandomised PRN back out along with the next seed value
return(new StringBuilder("WEE/")
.Append(randomisedFirstLetter)
.Append(randomisedSecondLetter)
.Append(randomisedNumber.ToString("D4"))
.Append(randomisedThirdLetter)
.Append(randomisedFourthLetter)
.ToString());
}
public string CreateUniqueRandomVersionOfPrn(PrnAsComponents prnAsComponents)
{
int firstLetterOrdinal = prnAsComponents.FirstLetter.GetOrdinalValue();
int secondLetterOrdinal = prnAsComponents.SecondLetter.GetOrdinalValue();
int thirdLetterOrdinal = prnAsComponents.ThirdLetter.GetOrdinalValue();
int fourthLetterOrdinal = prnAsComponents.FourthLetter.GetOrdinalValue();
// use quadratic residue to get a nice unique pseudorandomised version
int randomisedNumber = quadraticResidueHelper.ForFourDigitNumber(prnAsComponents.Number);
char randomisedFirstLetter = (char)(quadraticResidueHelper.ForSmallSubsetOfLetters(firstLetterOrdinal) + prnAsComponents.FirstLetter.BaseChar);
char randomisedSecondLetter = (char)(quadraticResidueHelper.ForSmallSubsetOfLetters(secondLetterOrdinal) + prnAsComponents.SecondLetter.BaseChar);
char randomisedThirdLetter = (char)(quadraticResidueHelper.ForSmallSubsetOfLetters(thirdLetterOrdinal) + prnAsComponents.ThirdLetter.BaseChar);
char randomisedFourthLetter = (char)(quadraticResidueHelper.ForSmallSubsetOfLetters(fourthLetterOrdinal) + prnAsComponents.FourthLetter.BaseChar);
// there's a few characters we want to skip to avoid confusion with numbers
if (randomisedFirstLetter >= 'O')
{
randomisedFirstLetter++;
}
if (randomisedSecondLetter >= 'O')
{
randomisedSecondLetter++;
}
if (randomisedThirdLetter >= 'I')
{
randomisedThirdLetter++;
}
if (randomisedFourthLetter >= 'I')
{
randomisedFourthLetter++;
}
// all done, toss the pseudorandomised PRN back out along with the next seed value
return new StringBuilder("WEE/")
.Append(randomisedFirstLetter)
.Append(randomisedSecondLetter)
.Append(randomisedNumber.ToString("D4"))
.Append(randomisedThirdLetter)
.Append(randomisedFourthLetter)
.ToString();
}
