Struct Id 

pub struct Id(/* private fields */);

A stable, globally unique identifier for a GML object.

Corresponds to the gml:id XML attribute (OGC 07-036 §7.2.4.5). An Id is a non-empty string; it can be constructed from arbitrary bytes or strings by hashing them with SHA-256, or generated as a random UUID v4.

Implementations

impl Id

pub fn from_hashed_bytes(val: impl AsRef<[u8]>) -> Self

Constructs an Id by hashing bytes using SHA-256.

The resulting id is a 64-character uppercase hex string.

Examples

use egml_core::model::base::Id;

let id = Id::from_hashed_bytes(b"hello");
assert_eq!(id.as_str().len(), 64);

pub fn from_hashed_string(val: &str) -> Self

Constructs an Id by hashing a string using SHA-256.

Two calls with equal strings always produce the same id.

Examples

use egml_core::model::base::Id;

let id_a = Id::from_hashed_string("object-42");
let id_b = Id::from_hashed_string("object-42");
assert_eq!(id_a, id_b);

pub fn from_hashed_u64(val: u64) -> Self

Constructs an Id by hashing a u64 using SHA-256 (little-endian bytes).

pub fn generate_uuid_v4() -> Self

Generates a random UUID v4 as an Id.

Examples

use egml_core::model::base::Id;

let id = Id::generate_uuid_v4();
assert!(!id.as_str().is_empty());

pub fn generate_uuid_v7() -> Self

Generates a time-ordered UUID v7 as an Id.

v7 encodes a millisecond-precision Unix timestamp in the high bits, making ids lexicographically sortable by creation time — preferable over v4 when ids are stored in a database index.

Examples

use egml_core::model::base::Id;

let a = Id::generate_uuid_v7();
let b = Id::generate_uuid_v7();
assert!(a.as_str() <= b.as_str());

pub fn generate_uuid_v5(namespace: &Uuid, name: &str) -> Self

Generates a deterministic UUID v5 from a namespace and a name.

Two calls with the same namespace and name always produce the same id. Use the predefined namespace constants on Uuid (e.g. Uuid::NAMESPACE_URL) or supply a custom one.

Examples

use egml_core::model::base::Id;
use uuid::Uuid;

let id_a = Id::generate_uuid_v5(&Uuid::NAMESPACE_URL, "https://example.com/object-1");
let id_b = Id::generate_uuid_v5(&Uuid::NAMESPACE_URL, "https://example.com/object-1");
assert_eq!(id_a, id_b);

pub fn as_str(&self) -> &str

Returns the id as a string slice.

Trait Implementations

impl Clone for Id

fn clone(&self) -> Id

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Id

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Id

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Id

impl From<Id> for String

fn from(item: Id) -> Self

Converts to this type from the input type.

impl Hash for Id

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Id

fn cmp(&self, other: &Id) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Id

fn eq(&self, other: &Id) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for Id

fn partial_cmp(&self, other: &Id) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Id

impl TryFrom<&str> for Id

fn try_from(item: &str) -> Result<Self, Self::Error>

Errors

Returns Error::EmptyId if the string slice is empty.

type Error = Error

The type returned in the event of a conversion error.

impl TryFrom<String> for Id

fn try_from(item: String) -> Result<Self, Self::Error>

Errors

Returns Error::EmptyId if the owned string is empty.

type Error = Error

The type returned in the event of a conversion error.