100 lines
2.7 KiB
Rust
100 lines
2.7 KiB
Rust
//! Strongly-typed identifiers.
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/// Define a UUID newtype identifier with the standard constructors and conversions.
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macro_rules! id_newtype {
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($(#[$meta:meta])* $name:ident) => {
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$(#[$meta])*
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, serde::Serialize, serde::Deserialize)]
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#[serde(transparent)]
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pub struct $name(uuid::Uuid);
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impl $name {
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/// Generate a fresh random id.
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#[must_use = "generating an id and discarding it is almost certainly a mistake"]
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pub fn new() -> Self {
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Self(uuid::Uuid::new_v4())
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}
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/// Wrap an existing [`uuid::Uuid`].
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pub fn from_uuid(uuid: uuid::Uuid) -> Self {
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Self(uuid)
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}
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/// The underlying [`uuid::Uuid`].
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pub fn to_uuid(&self) -> uuid::Uuid {
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self.0
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}
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}
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impl Default for $name {
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fn default() -> Self {
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Self::new()
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}
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}
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impl std::fmt::Display for $name {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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std::fmt::Display::fmt(&self.0, f)
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}
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}
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impl std::str::FromStr for $name {
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type Err = uuid::Error;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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Ok(Self(uuid::Uuid::parse_str(s)?))
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}
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}
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};
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}
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id_newtype!(
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/// Identifier for an organization (tenant).
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OrgId
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);
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id_newtype!(
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/// Identifier for a controlled vocabulary (term source).
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VocabularyId
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);
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id_newtype!(
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/// Identifier for a term within a vocabulary.
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TermId
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);
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id_newtype!(
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/// Identifier for an authority record (person, organisation, or place).
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AuthorityId
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);
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id_newtype!(
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/// Identifier for a catalogue object (or group of objects).
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ObjectId
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);
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id_newtype!(
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/// Identifier for a flexible-field definition.
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FieldDefinitionId
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);
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn parses_and_displays_round_trip() {
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let text = "550e8400-e29b-41d4-a716-446655440000";
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let id: OrgId = text.parse().expect("valid uuid should parse");
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assert_eq!(id.to_string(), text);
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}
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#[test]
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fn rejects_invalid_uuid() {
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assert!("not-a-uuid".parse::<OrgId>().is_err());
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}
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#[test]
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fn distinct_id_types_parse_independently() {
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let text = "550e8400-e29b-41d4-a716-446655440000";
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assert_eq!(text.parse::<VocabularyId>().unwrap().to_string(), text);
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assert_eq!(text.parse::<TermId>().unwrap().to_string(), text);
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assert_eq!(text.parse::<AuthorityId>().unwrap().to_string(), text);
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}
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}
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