rdfx 0.23.1

RDF 1.2 data-structures, traits and utilities: terms (incl. triple terms), triples, quads, interpretations, graphs, datasets, unstar/restar reification helpers.
Documentation 
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use crate::BlankId;
use std::convert::TryFrom;

/// Blank id index.
#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord, Debug)]
pub struct BlankIdIndex(usize);

impl From<usize> for BlankIdIndex {
    fn from(i: usize) -> Self {
        Self(i)
    }
}

impl From<BlankIdIndex> for usize {
    fn from(value: BlankIdIndex) -> Self {
        value.0
    }
}

impl IndexedBlankId for BlankIdIndex {
    fn blank_id_index(&self) -> BlankIdOrIndex<&'_ BlankId> {
        BlankIdOrIndex::Index(self.0)
    }
}

impl<'a> TryFrom<&'a BlankId> for BlankIdIndex {
    type Error = ();

    fn try_from(_value: &'a BlankId) -> Result<Self, Self::Error> {
        Err(())
    }
}

#[cfg(feature = "contextual")]
impl<V: crate::vocabulary::BlankIdVocabulary<BlankId = Self>> contextual::DisplayWithContext<V>
    for BlankIdIndex
{
    fn fmt_with(&self, vocabulary: &V, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        std::fmt::Display::fmt(&vocabulary.blank_id(self).unwrap(), f)
    }
}

#[cfg(feature = "contextual")]
impl<V: crate::vocabulary::BlankIdVocabulary<BlankId = Self>> crate::RdfDisplayWithContext<V>
    for BlankIdIndex
{
    fn rdf_fmt_with(&self, vocabulary: &V, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        std::fmt::Display::fmt(&vocabulary.blank_id(self).unwrap(), f)
    }
}

/// Blank node identifier index.
#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord, Debug)]
pub enum BlankIdOrIndex<B> {
    /// Index of the blank node identifier in the vocabulary.
    Index(usize),

    /// Non indexed blank node identifier.
    BlankId(B),
}

impl<I> From<usize> for BlankIdOrIndex<I> {
    fn from(i: usize) -> Self {
        Self::Index(i)
    }
}

impl<'a, I: TryFrom<&'a BlankId>> TryFrom<&'a BlankId> for BlankIdOrIndex<I> {
    type Error = I::Error;

    fn try_from(value: &'a BlankId) -> Result<Self, Self::Error> {
        Ok(Self::BlankId(I::try_from(value)?))
    }
}

/// Partly indexed blank node identifier type.
pub trait IndexedBlankId: From<usize> + for<'a> TryFrom<&'a BlankId> {
    fn blank_id_index(&self) -> BlankIdOrIndex<&'_ BlankId>;
}

impl<B> IndexedBlankId for BlankIdOrIndex<B>
where
    B: AsRef<BlankId> + for<'a> TryFrom<&'a BlankId>,
{
    fn blank_id_index(&self) -> BlankIdOrIndex<&'_ BlankId> {
        match self {
            Self::BlankId(i) => BlankIdOrIndex::BlankId(i.as_ref()),
            Self::Index(i) => BlankIdOrIndex::Index(*i),
        }
    }
}