|
|
|
use std::fmt;
|
|
|
|
use uuid::Uuid;
|
|
|
|
|
|
|
|
/// A RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node).
|
|
|
|
///
|
|
|
|
/// This implementation enforces that the blank node id is an UUID to easily ensure
|
|
|
|
/// that it is not possible for two blank nodes to share an id.
|
|
|
|
///
|
|
|
|
/// The common way to create a new blank node is to use the `Default::default` trait method.
|
|
|
|
///
|
|
|
|
/// The default string formatter is returning a N-Triples, Turtle and SPARQL compatible representation.
|
|
|
|
/// `BlankNode::default().to_string()` should return something like `_:00112233445566778899aabbccddeeff`
|
|
|
|
///
|
|
|
|
#[derive(Eq, PartialEq, Ord, PartialOrd, Debug, Clone, Hash)]
|
|
|
|
pub struct BlankNode {
|
|
|
|
id: Uuid,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl BlankNode {
|
|
|
|
/// Returns the underlying UUID of this blank node
|
|
|
|
pub fn as_uuid(&self) -> &Uuid {
|
|
|
|
&self.id
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl fmt::Display for BlankNode {
|
|
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
|
|
write!(f, "_:{}", self.id.to_simple())
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Default for BlankNode {
|
|
|
|
/// Builds a new RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) with a unique id
|
|
|
|
fn default() -> Self {
|
|
|
|
Self { id: Uuid::new_v4() }
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl From<Uuid> for BlankNode {
|
|
|
|
fn from(id: Uuid) -> Self {
|
|
|
|
Self { id }
|
|
|
|
}
|
|
|
|
}
|