tools/publish/src/rdf/materialize.rs

use oxigraph::model::{Dataset, GraphName, NamedNodeRef, NamedOrBlankNode, NamedOrBlankNodeRef, Term};
use oxigraph::sparql::SparqlEvaluator;
use oxigraph::store::Store;
use tracing::{debug, debug_span};
use crate::error;
use crate::rdf::vocab::owl;

const INFERENCE_GRAPH: NamedNodeRef = NamedNodeRef::new_unchecked("https://graphofliberty.org/inference");
const RDF_SCHEMA: NamedNodeRef = NamedNodeRef::new_unchecked("http://www.w3.org/2000/01/rdf-schema#");

pub fn same_as(store: &mut Store) -> error::Result<()> {
    let span = debug_span!("Materialize owl:sameAs");
    let _enter = span.enter();

    let additional_quads = store
        .quads_for_pattern(None, Some(owl::SAME_AS), None, None)
        .filter_map(Result::ok)
        .fold(Dataset::new(), |mut new_dataset, alias| {
            if let NamedOrBlankNode::NamedNode(x) = alias.subject
                && let Term::NamedNode(y) = alias.object
            {
                for mut quad in store.quads_for_pattern(
                    Some(NamedOrBlankNodeRef::NamedNode(x.as_ref())),
                    None,
                    None,
                    None,
                ).filter_map(Result::ok) {
                    quad.subject = NamedOrBlankNode::NamedNode(y.clone());
                    quad.graph_name = GraphName::NamedNode(INFERENCE_GRAPH.into_owned());
                    new_dataset.insert(quad.as_ref());
                }

                for mut quad in store.quads_for_pattern(
                    Some(NamedOrBlankNodeRef::NamedNode(y.as_ref())),
                    None,
                    None,
                    None,
                ).filter_map(Result::ok) {
                    quad.subject = NamedOrBlankNode::NamedNode(x.clone());
                    quad.graph_name = GraphName::NamedNode(INFERENCE_GRAPH.into_owned());
                    new_dataset.insert(quad.as_ref());
                }
            }
            new_dataset
        });

    let old_size = store.len()?;
    store.extend(&additional_quads)?;
    let new_size = store.len()?;

    if new_size > old_size {
        let difference = new_size - old_size;
        debug!(?old_size, ?new_size, ?difference, "same_as");
        same_as(store)?;
    }

    Ok(())
}

pub fn super_properties(store: &mut Store) -> error::Result<()> {
    let span = debug_span!("Materialize rdfs:subPropertyOf");
    let _enter = span.enter();

    let update = SparqlEvaluator::new()
        .with_prefix("rdfs", RDF_SCHEMA.as_str())?
        .with_prefix("inference", INFERENCE_GRAPH.as_str())?
        .parse_update(r#"INSERT {
    GRAPH inference: {
        ?property rdfs:subPropertyOf ?parent .
        ?subject ?parent ?object .
    }
} WHERE {
    GRAPH ?g1 { ?property rdfs:subPropertyOf+ ?parent }
    OPTIONAL { GRAPH ?g2 { ?subject ?property ?object } }
}"#)?;

    let old_size = store.len()?;
    update.on_store(&store).execute()?;
    let new_size = store.len()?;

    if new_size > old_size {
        let difference = new_size - old_size;
        debug!(?old_size, ?new_size, ?difference, "super_properties");
        super_properties(store)?;
    }

    Ok(())
}

pub fn super_classes(store: &mut Store) -> error::Result<()> {
    let span = debug_span!("Materialize rdfs:subClassOf");
    let _enter = span.enter();

    let update = SparqlEvaluator::new()
        .with_prefix("rdfs", RDF_SCHEMA.as_str())?
        .with_prefix("inference", INFERENCE_GRAPH.as_str())?
        .parse_update(r#"INSERT {
    GRAPH inference: {
        ?class rdfs:subClassOf ?parent .
        ?item a ?parent .
    }
} WHERE {
    GRAPH ?g1 { ?class rdfs:subClassOf+ ?parent }
    OPTIONAL { GRAPH ?g2 { ?item a ?class } }
}"#)?;

    let old_size = store.len()?;
    update.on_store(&store).execute()?;
    let new_size = store.len()?;

    if new_size > old_size {
        let difference = new_size - old_size;
        debug!(?old_size, ?new_size, ?difference, "super_classes");
        super_classes(store)?;
    }

    Ok(())
}