// Copyright 2013-2014 The Rust Project Developers.
// Copyright 2018 The Uuid Project Developers.
//
// See the COPYRIGHT file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
//
http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or
http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! A Builder type for [`Uuid`]s.
//!
//! [`Uuid`]: ../struct.Uuid.html
use crate::{error::*, timestamp, Bytes, Uuid, Variant, Version};
/// A builder for creating a UUID.
///
/// This type is useful if you need to mutate individual fields of a [`Uuid`]
/// while constructing it. Since the [`Uuid`] type is `Copy`, it doesn't offer
/// any methods to mutate in place. They live on the `Builder` instead.
///
/// The `Builder` type also always exposes APIs to construct [`Uuid`]s for any
/// version without needing crate features or additional dependencies. It's a
/// lower-level API than the methods on [`Uuid`].
///
/// # Examples
///
/// Creating a version 4 UUID from externally generated random bytes:
///
/// ```
/// # use uuid::{Builder, Version, Variant};
/// # let rng = || [
/// # 70, 235, 208, 238, 14, 109, 67, 201, 185, 13, 204, 195, 90,
/// # 145, 63, 62,
/// # ];
/// let random_bytes = rng();
///
/// let uuid = Builder::from_random_bytes(random_bytes).into_uuid();
///
/// assert_eq!(Some(Version::Random), uuid.get_version());
/// assert_eq!(Variant::RFC4122, uuid.get_variant());
/// ```
#[allow(missing_copy_implementations)]
#[derive(Debug)]
pub struct Builder(Uuid);
impl Uuid {
/// The 'nil UUID' (all zeros).
///
/// The nil UUID is a special form of UUID that is specified to have all
/// 128 bits set to zero.
///
/// # References
///
/// * [Nil UUID in RFC4122](
https://tools.ietf.org/html/rfc4122.html#section-4.1.7)
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Uuid;
/// let uuid = Uuid::nil();
///
/// assert_eq!(
/// "00000000-0000-0000-0000-000000000000",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn nil() -> Self {
Uuid::from_bytes([0; 16])
}
/// The 'max UUID' (all ones).
///
/// The max UUID is a special form of UUID that is specified to have all
/// 128 bits set to one.
///
/// # References
///
/// * [Max UUID in Draft RFC: New UUID Formats, Version 4](
https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#section-5.4)
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Uuid;
/// let uuid = Uuid::max();
///
/// assert_eq!(
/// "ffffffff-ffff-ffff-ffff-ffffffffffff",
/// uuid.hyphenated().to_string(),
/// );
/// ```
#[cfg(uuid_unstable)]
pub const fn max() -> Self {
Uuid::from_bytes([0xFF; 16])
}
/// Creates a UUID from four field values.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Uuid;
/// let d1 = 0xa1a2a3a4;
/// let d2 = 0xb1b2;
/// let d3 = 0xc1c2;
/// let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
///
/// let uuid = Uuid::from_fields(d1, d2, d3, &d4);
///
/// assert_eq!(
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn from_fields(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Uuid {
Uuid::from_bytes([
(d1 >> 24) as u8,
(d1 >> 16) as u8,
(d1 >> 8) as u8,
d1 as u8,
(d2 >> 8) as u8,
d2 as u8,
(d3 >> 8) as u8,
d3 as u8,
d4[0],
d4[1],
d4[2],
d4[3],
d4[4],
d4[5],
d4[6],
d4[7],
])
}
/// Creates a UUID from four field values in little-endian order.
///
/// The bytes in the `d1`, `d2` and `d3` fields will be flipped to convert
/// into big-endian order. This is based on the endianness of the UUID,
/// rather than the target environment so bytes will be flipped on both
/// big and little endian machines.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Uuid;
/// let d1 = 0xa1a2a3a4;
/// let d2 = 0xb1b2;
/// let d3 = 0xc1c2;
/// let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
///
/// let uuid = Uuid::from_fields_le(d1, d2, d3, &d4);
///
/// assert_eq!(
/// "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn from_fields_le(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Uuid {
Uuid::from_bytes([
d1 as u8,
(d1 >> 8) as u8,
(d1 >> 16) as u8,
(d1 >> 24) as u8,
(d2) as u8,
(d2 >> 8) as u8,
d3 as u8,
(d3 >> 8) as u8,
d4[0],
d4[1],
d4[2],
d4[3],
d4[4],
d4[5],
d4[6],
d4[7],
])
}
/// Creates a UUID from a 128bit value.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Uuid;
/// let v = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8u128;
///
/// let uuid = Uuid::from_u128(v);
///
/// assert_eq!(
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn from_u128(v: u128) -> Self {
Uuid::from_bytes([
(v >> 120) as u8,
(v >> 112) as u8,
(v >> 104) as u8,
(v >> 96) as u8,
(v >> 88) as u8,
(v >> 80) as u8,
(v >> 72) as u8,
(v >> 64) as u8,
(v >> 56) as u8,
(v >> 48) as u8,
(v >> 40) as u8,
(v >> 32) as u8,
(v >> 24) as u8,
(v >> 16) as u8,
(v >> 8) as u8,
v as u8,
])
}
/// Creates a UUID from a 128bit value in little-endian order.
///
/// The entire value will be flipped to convert into big-endian order.
/// This is based on the endianness of the UUID, rather than the target
/// environment so bytes will be flipped on both big and little endian
/// machines.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Uuid;
/// let v = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8u128;
///
/// let uuid = Uuid::from_u128_le(v);
///
/// assert_eq!(
/// "d8d7d6d5-d4d3-d2d1-c2c1-b2b1a4a3a2a1",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn from_u128_le(v: u128) -> Self {
Uuid::from_bytes([
v as u8,
(v >> 8) as u8,
(v >> 16) as u8,
(v >> 24) as u8,
(v >> 32) as u8,
(v >> 40) as u8,
(v >> 48) as u8,
(v >> 56) as u8,
(v >> 64) as u8,
(v >> 72) as u8,
(v >> 80) as u8,
(v >> 88) as u8,
(v >> 96) as u8,
(v >> 104) as u8,
(v >> 112) as u8,
(v >> 120) as u8,
])
}
/// Creates a UUID from two 64bit values.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Uuid;
/// let hi = 0xa1a2a3a4b1b2c1c2u64;
/// let lo = 0xd1d2d3d4d5d6d7d8u64;
///
/// let uuid = Uuid::from_u64_pair(hi, lo);
///
/// assert_eq!(
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn from_u64_pair(high_bits: u64, low_bits: u64) -> Self {
Uuid::from_bytes([
(high_bits >> 56) as u8,
(high_bits >> 48) as u8,
(high_bits >> 40) as u8,
(high_bits >> 32) as u8,
(high_bits >> 24) as u8,
(high_bits >> 16) as u8,
(high_bits >> 8) as u8,
high_bits as u8,
(low_bits >> 56) as u8,
(low_bits >> 48) as u8,
(low_bits >> 40) as u8,
(low_bits >> 32) as u8,
(low_bits >> 24) as u8,
(low_bits >> 16) as u8,
(low_bits >> 8) as u8,
low_bits as u8,
])
}
/// Creates a UUID using the supplied bytes.
///
/// # Errors
///
/// This function will return an error if `b` has any length other than 16.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # fn main() -> Result<(), uuid::Error> {
/// # use uuid::Uuid;
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Uuid::from_slice(&bytes)?;
///
/// assert_eq!(
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// # Ok(())
/// # }
/// ```
pub fn from_slice(b: &[u8]) -> Result<Uuid, Error> {
if b.len() != 16 {
return Err(Error(ErrorKind::ByteLength { len: b.len() }));
}
let mut bytes: Bytes = [0; 16];
bytes.copy_from_slice(b);
Ok(Uuid::from_bytes(bytes))
}
/// Creates a UUID using the supplied bytes in little endian order.
///
/// The individual fields encoded in the buffer will be flipped.
///
/// # Errors
///
/// This function will return an error if `b` has any length other than 16.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # fn main() -> Result<(), uuid::Error> {
/// # use uuid::Uuid;
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Uuid::from_slice_le(&bytes)?;
///
/// assert_eq!(
/// uuid.hyphenated().to_string(),
/// "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8"
/// );
/// # Ok(())
/// # }
/// ```
pub fn from_slice_le(b: &[u8]) -> Result<Uuid, Error> {
if b.len() != 16 {
return Err(Error(ErrorKind::ByteLength { len: b.len() }));
}
let mut bytes: Bytes = [0; 16];
bytes.copy_from_slice(b);
Ok(Uuid::from_bytes_le(bytes))
}
/// Creates a UUID using the supplied bytes.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # fn main() -> Result<(), uuid::Error> {
/// # use uuid::Uuid;
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Uuid::from_bytes(bytes);
///
/// assert_eq!(
/// uuid.hyphenated().to_string(),
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8"
/// );
/// # Ok(())
/// # }
/// ```
pub const fn from_bytes(bytes: Bytes) -> Uuid {
Uuid(bytes)
}
/// Creates a UUID using the supplied bytes in little endian order.
///
/// The individual fields encoded in the buffer will be flipped.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # fn main() -> Result<(), uuid::Error> {
/// # use uuid::Uuid;
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Uuid::from_bytes_le(bytes);
///
/// assert_eq!(
/// "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// # Ok(())
/// # }
/// ```
pub const fn from_bytes_le(b: Bytes) -> Uuid {
Uuid([
b[3], b[2], b[1], b[0], b[5], b[4], b[7], b[6], b[8], b[9], b[10], b[11], b[12], b[13],
b[14], b[15],
])
}
/// Creates a reference to a UUID from a reference to the supplied bytes.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # fn main() -> Result<(), uuid::Error> {
/// # use uuid::Uuid;
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Uuid::from_bytes_ref(&bytes);
///
/// assert_eq!(
/// uuid.hyphenated().to_string(),
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8"
/// );
///
/// assert!(std::ptr::eq(
/// uuid as *const Uuid as *const u8,
/// &bytes as *const [u8; 16] as *const u8,
/// ));
/// # Ok(())
/// # }
/// ```
pub fn from_bytes_ref(bytes: &Bytes) -> &Uuid {
// SAFETY: `Bytes` and `Uuid` have the same ABI
unsafe { &*(bytes as *const Bytes as *const Uuid) }
}
// NOTE: There is no `from_u128_ref` because in little-endian
// environments the value isn't properly encoded. Callers would
// need to use `.to_be()` themselves.
}
impl Builder {
/// Creates a `Builder` using the supplied bytes.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Builder::from_bytes(bytes).into_uuid();
///
/// assert_eq!(
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn from_bytes(b: Bytes) -> Self {
Builder(Uuid::from_bytes(b))
}
/// Creates a `Builder` using the supplied bytes in little endian order.
///
/// The individual fields encoded in the buffer will be flipped.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # fn main() -> Result<(), uuid::Error> {
/// # use uuid::{Builder, Uuid};
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Builder::from_bytes_le(bytes).into_uuid();
///
/// assert_eq!(
/// "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// # Ok(())
/// # }
/// ```
pub const fn from_bytes_le(b: Bytes) -> Self {
Builder(Uuid::from_bytes_le(b))
}
/// Creates a `Builder` for a version 1 UUID using the supplied timestamp and node ID.
pub const fn from_rfc4122_timestamp(ticks: u64, counter: u16, node_id: &[u8; 6]) -> Self {
Builder(timestamp::encode_rfc4122_timestamp(ticks, counter, node_id))
}
/// Creates a `Builder` for a version 3 UUID using the supplied MD5 hashed bytes.
pub const fn from_md5_bytes(md5_bytes: Bytes) -> Self {
Builder(Uuid::from_bytes(md5_bytes))
.with_variant(Variant::RFC4122)
.with_version(Version::Md5)
}
/// Creates a `Builder` for a version 4 UUID using the supplied random bytes.
///
/// This method assumes the bytes are already sufficiently random, it will only
/// set the appropriate bits for the UUID version and variant.
///
/// # Examples
///
/// ```
/// # use uuid::{Builder, Variant, Version};
/// # let rng = || [
/// # 70, 235, 208, 238, 14, 109, 67, 201, 185, 13, 204, 195, 90,
/// # 145, 63, 62,
/// # ];
/// let random_bytes = rng();
/// let uuid = Builder::from_random_bytes(random_bytes).into_uuid();
///
/// assert_eq!(Some(Version::Random), uuid.get_version());
/// assert_eq!(Variant::RFC4122, uuid.get_variant());
/// ```
pub const fn from_random_bytes(random_bytes: Bytes) -> Self {
Builder(Uuid::from_bytes(random_bytes))
.with_variant(Variant::RFC4122)
.with_version(Version::Random)
}
/// Creates a `Builder` for a version 5 UUID using the supplied SHA-1 hashed bytes.
///
/// This method assumes the bytes are already a SHA-1 hash, it will only set the appropriate
/// bits for the UUID version and variant.
pub const fn from_sha1_bytes(sha1_bytes: Bytes) -> Self {
Builder(Uuid::from_bytes(sha1_bytes))
.with_variant(Variant::RFC4122)
.with_version(Version::Sha1)
}
/// Creates a `Builder` for a version 6 UUID using the supplied timestamp and node ID.
///
/// This method will encode the ticks, counter, and node ID in a sortable UUID.
#[cfg(uuid_unstable)]
pub const fn from_sorted_rfc4122_timestamp(
ticks: u64,
counter: u16,
node_id: &[u8; 6],
) -> Self {
Builder(timestamp::encode_sorted_rfc4122_timestamp(
ticks, counter, node_id,
))
}
/// Creates a `Builder` for a version 7 UUID using the supplied Unix timestamp and random bytes.
///
/// This method assumes the bytes are already sufficiently random.
///
/// # Examples
///
/// Creating a UUID using the current system timestamp:
///
/// ```
/// # use std::convert::TryInto;
/// use std::time::{Duration, SystemTime};
/// # fn main() -> Result<(), Box<dyn std::error::Error>> {
/// # use uuid::{Builder, Uuid, Variant, Version, Timestamp, NoContext};
/// # let rng = || [
/// # 70, 235, 208, 238, 14, 109, 67, 201, 185, 13
/// # ];
/// let ts = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
///
/// let random_bytes = rng();
///
/// let uuid = Builder::from_unix_timestamp_millis(ts.as_millis().try_into()?, &random_bytes).into_uuid();
///
/// assert_eq!(Some(Version::SortRand), uuid.get_version());
/// assert_eq!(Variant::RFC4122, uuid.get_variant());
/// # Ok(())
/// # }
/// ```
#[cfg(uuid_unstable)]
pub const fn from_unix_timestamp_millis(millis: u64, random_bytes: &[u8; 10]) -> Self {
Builder(timestamp::encode_unix_timestamp_millis(
millis,
random_bytes,
))
}
/// Creates a `Builder` for a version 8 UUID using the supplied user-defined bytes.
///
/// This method won't interpret the given bytes in any way, except to set the appropriate
/// bits for the UUID version and variant.
#[cfg(uuid_unstable)]
pub const fn from_custom_bytes(custom_bytes: Bytes) -> Self {
Builder::from_bytes(custom_bytes)
.with_variant(Variant::RFC4122)
.with_version(Version::Custom)
}
/// Creates a `Builder` using the supplied bytes.
///
/// # Errors
///
/// This function will return an error if `b` has any length other than 16.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// # fn main() -> Result<(), uuid::Error> {
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Builder::from_slice(&bytes)?.into_uuid();
///
/// assert_eq!(
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// # Ok(())
/// # }
/// ```
pub fn from_slice(b: &[u8]) -> Result<Self, Error> {
Ok(Builder(Uuid::from_slice(b)?))
}
/// Creates a `Builder` using the supplied bytes in little endian order.
///
/// The individual fields encoded in the buffer will be flipped.
///
/// # Errors
///
/// This function will return an error if `b` has any length other than 16.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// # fn main() -> Result<(), uuid::Error> {
/// let bytes = [
/// 0xa1, 0xa2, 0xa3, 0xa4,
/// 0xb1, 0xb2,
/// 0xc1, 0xc2,
/// 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
/// ];
///
/// let uuid = Builder::from_slice_le(&bytes)?.into_uuid();
///
/// assert_eq!(
/// "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// # Ok(())
/// # }
/// ```
pub fn from_slice_le(b: &[u8]) -> Result<Self, Error> {
Ok(Builder(Uuid::from_slice_le(b)?))
}
/// Creates a `Builder` from four field values.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// let d1 = 0xa1a2a3a4;
/// let d2 = 0xb1b2;
/// let d3 = 0xc1c2;
/// let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
///
/// let uuid = Builder::from_fields(d1, d2, d3, &d4).into_uuid();
///
/// assert_eq!(
/// uuid.hyphenated().to_string(),
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8"
/// );
/// ```
pub const fn from_fields(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Self {
Builder(Uuid::from_fields(d1, d2, d3, d4))
}
/// Creates a `Builder` from four field values.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// let d1 = 0xa1a2a3a4;
/// let d2 = 0xb1b2;
/// let d3 = 0xc1c2;
/// let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
///
/// let uuid = Builder::from_fields_le(d1, d2, d3, &d4).into_uuid();
///
/// assert_eq!(
/// uuid.hyphenated().to_string(),
/// "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8"
/// );
/// ```
pub const fn from_fields_le(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Self {
Builder(Uuid::from_fields_le(d1, d2, d3, d4))
}
/// Creates a `Builder` from a 128bit value.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// let v = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8u128;
///
/// let uuid = Builder::from_u128(v).into_uuid();
///
/// assert_eq!(
/// "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn from_u128(v: u128) -> Self {
Builder(Uuid::from_u128(v))
}
/// Creates a UUID from a 128bit value in little-endian order.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// let v = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8u128;
///
/// let uuid = Builder::from_u128_le(v).into_uuid();
///
/// assert_eq!(
/// "d8d7d6d5-d4d3-d2d1-c2c1-b2b1a4a3a2a1",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn from_u128_le(v: u128) -> Self {
Builder(Uuid::from_u128_le(v))
}
/// Creates a `Builder` with an initial [`Uuid::nil`].
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// let uuid = Builder::nil().into_uuid();
///
/// assert_eq!(
/// "00000000-0000-0000-0000-000000000000",
/// uuid.hyphenated().to_string(),
/// );
/// ```
pub const fn nil() -> Self {
Builder(Uuid::nil())
}
/// Specifies the variant of the UUID.
pub fn set_variant(&mut self, v: Variant) -> &mut Self {
*self = Builder(self.0).with_variant(v);
self
}
/// Specifies the variant of the UUID.
pub const fn with_variant(mut self, v: Variant) -> Self {
let byte = (self.0).0[8];
(self.0).0[8] = match v {
Variant::NCS => byte & 0x7f,
Variant::RFC4122 => (byte & 0x3f) | 0x80,
Variant::Microsoft => (byte & 0x1f) | 0xc0,
Variant::Future => byte | 0xe0,
};
self
}
/// Specifies the version number of the UUID.
pub fn set_version(&mut self, v: Version) -> &mut Self {
*self = Builder(self.0).with_version(v);
self
}
/// Specifies the version number of the UUID.
pub const fn with_version(mut self, v: Version) -> Self {
(self.0).0[6] = ((self.0).0[6] & 0x0f) | ((v as u8) << 4);
self
}
/// Get a reference to the underlying [`Uuid`].
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// let builder = Builder::nil();
///
/// let uuid1 = builder.as_uuid();
/// let uuid2 = builder.as_uuid();
///
/// assert_eq!(uuid1, uuid2);
/// ```
pub const fn as_uuid(&self) -> &Uuid {
&self.0
}
/// Convert the builder into a [`Uuid`].
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// # use uuid::Builder;
/// let uuid = Builder::nil().into_uuid();
///
/// assert_eq!(
/// uuid.hyphenated().to_string(),
/// "00000000-0000-0000-0000-000000000000"
/// );
/// ```
pub const fn into_uuid(self) -> Uuid {
self.0
}
}
