rdf-dataset-fragmenter/lib/Fragmenter.js

Fragments an RDF dataset into multiple parts

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Fragmenter = void 0;
const QuadTransformStream_1 = require("./transform/QuadTransformStream");
/**
 * Fragments quads from a given source into a given sink.
 */
class Fragmenter {
    quadSource;
    transformers;
    fragmentationStrategy;
    quadSink;
    transformCallBack;
    constructor(options) {
        this.quadSource = options.quadSource;
        this.transformers = options.transformers;
        this.fragmentationStrategy = options.fragmentationStrategy;
        this.quadSink = options.quadSink;
        this.transformCallBack = options.transformCallback;
    }
    static getTransformedQuadStream(quadSource, transformers, transformCallback) {
        const quadStream = quadSource.getQuads();
        if (transformers.length > 0) {
            const transformedQuadStream = new QuadTransformStream_1.QuadTransformStream(transformers, transformCallback);
            quadStream.on('error', (error) => transformedQuadStream.emit('error', error));
            quadStream.pipe(transformedQuadStream);
            return transformedQuadStream;
        }
        return quadStream;
    }
    /**
     * Read quads from a given source, fragment it into the sink, and close the sink.
     */
    async fragment() {
        if (this.transformCallBack) {
            await Promise.all(this.transformCallBack.map(callback => callback.initializeCallback()));
        }
        await this.fragmentationStrategy.fragment(Fragmenter.getTransformedQuadStream(this.quadSource, this.transformers ?? [], this.transformCallBack), this.quadSink);
        await this.quadSink.close();
        this.transformCallBack?.map(callback => callback.end());
    }
}
exports.Fragmenter = Fragmenter;
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