package jnpf.fileStorage.dms;

import java.security.SecureRandom;
import java.util.UUID;

public final class UuidV7Generator {
    private static final SecureRandom RANDOM = new SecureRandom();

    private UuidV7Generator() {
    }

    public static UUID generate() {
        long timestamp = System.currentTimeMillis() & 0x0000FFFFFFFFFFFFL;
        long randomA = RANDOM.nextInt(1 << 12);
        long mostSignificantBits = (timestamp << 16) | 0x7000L | randomA;
        long leastSignificantBits = RANDOM.nextLong();
        leastSignificantBits = (leastSignificantBits & 0x3FFFFFFFFFFFFFFFL)
                | 0x8000000000000000L;
        return new UUID(mostSignificantBits, leastSignificantBits);
    }
}