rdf-dataset-fragmenter/lib/io/QuadSourceComposite.js

Fragments an RDF dataset into multiple parts

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.QuadSourceComposite = void 0;
const node_stream_1 = require("node:stream");
/**
 * A quad source that combines multiple quad sources.
 *
 * Concretely, this will create a concatenated stream of all the given sources streams.
 */
class QuadSourceComposite {
    constructor(sources) {
        this.sources = sources;
    }
    getQuads() {
        const concat = new node_stream_1.PassThrough({ objectMode: true });
        let endedStreams = 0;
        for (const source of this.sources) {
            const stream = source.getQuads();
            stream.pipe(concat, { end: false });
            stream.on('error', error => concat.emit('error', error));
            stream.on('end', () => {
                if (++endedStreams === this.sources.length) {
                    concat.end();
                }
            });
        }
        // Special case when we have no sources
        if (this.sources.length === 0) {
            concat.end();
        }
        return concat;
    }
}
exports.QuadSourceComposite = QuadSourceComposite;
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