rdf-dataset-fragmenter/lib/strategy/FragmentationStrategySubject.js

Fragments an RDF dataset into multiple parts

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.FragmentationStrategySubject = void 0;
const relative_to_absolute_iri_1 = require("relative-to-absolute-iri");
const FragmentationBlankNodeBuffer_1 = require("./FragmentationBlankNodeBuffer");
const FragmentationStrategyStreamAdapter_1 = require("./FragmentationStrategyStreamAdapter");
/**
 * A fragmentation strategy that places quads into their subject's document.
 */
class FragmentationStrategySubject extends FragmentationStrategyStreamAdapter_1.FragmentationStrategyStreamAdapter {
    constructor(eagerFlushing = true, relativePath) {
        super();
        this.blankNodeBuffer = new FragmentationBlankNodeBuffer_1.FragmentationBlankNodeBuffer('subject', 'object', eagerFlushing);
        this.relativePath = relativePath;
    }
    async handleQuad(quad, quadSink) {
        // Only accept IRI subjects.
        if (quad.subject.termType === 'NamedNode') {
            // If the subject is a named node, add the quad to the subject's document.
            const baseIri = quad.subject.value.endsWith('/') ? quad.subject.value : `${quad.subject.value}/`;
            const iri = this.relativePath ? (0, relative_to_absolute_iri_1.resolve)(this.relativePath, baseIri) : quad.subject.value;
            await quadSink.push(iri, quad);
            // Save the subject in our blank node buffer, as it may be needed to identify documents for other quads.
            await this.blankNodeBuffer.materializeValueForNamedKey(quad.object, quad.subject, quadSink);
        }
        await this.blankNodeBuffer.push(quad, quadSink);
    }
    async flush(quadSink) {
        await super.flush(quadSink);
        await this.blankNodeBuffer.flush(quadSink);
    }
}
exports.FragmentationStrategySubject = FragmentationStrategySubject;
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