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Added Uuid generator class

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Signed-off-by: Andreas Fahrecker <AndreasFahrecker@gmail.com>
This commit is contained in:
Andreas Fahrecker 2020-10-13 15:04:23 +02:00
parent e4c0a50ece
commit 5d9f665426
1 changed files with 26 additions and 0 deletions
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lib/uuid.dart Normal file
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import 'dart:math';
class Uuid {
final Random _random = Random();
/// Generate a version 4 (random) uuid. This is a uuid scheme that only uses
/// random numbers as the source of the generated uuid.
String generateV4() {
// Generate xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx / 8-4-4-4-12.
final special = 8 + _random.nextInt(4);
return '${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}-'
'${_bitsDigits(16, 4)}-'
'4${_bitsDigits(12, 3)}-'
'${_printDigits(special, 1)}${_bitsDigits(12, 3)}-'
'${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}';
}
String _bitsDigits(int bitCount, int digitCount) =>
_printDigits(_generateBits(bitCount), digitCount);
int _generateBits(int bitCount) => _random.nextInt(1 << bitCount);
String _printDigits(int value, int count) =>
value.toRadixString(16).padLeft(count, '0');
}