rdf-dataset-fragmenter/lib/transform/QuadTransformStream.js

Fragments an RDF dataset into multiple parts

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.QuadTransformStream = void 0;
const node_stream_1 = require("node:stream");
/**
 * A transform stream that runs quads through an array of transformers.
 */
class QuadTransformStream extends node_stream_1.Transform {
    constructor(transformers) {
        super({ objectMode: true });
        this.transformers = transformers;
    }
    runTransformers(quad) {
        let quads = [quad];
        for (const transformer of this.transformers) {
            const newQuads = [];
            for (const quadIn of quads) {
                for (const quadOut of transformer.transform(quadIn)) {
                    newQuads.push(quadOut);
                }
            }
            quads = newQuads;
        }
        return quads;
    }
    // eslint-disable-next-line ts/naming-convention
    _transform(quad, encoding, callback) {
        for (const transformedQuad of this.runTransformers(quad)) {
            this.push(transformedQuad);
        }
        callback();
    }
    // eslint-disable-next-line ts/naming-convention
    _flush(callback) {
        for (const transformer of this.transformers) {
            if (transformer.end) {
                transformer.end();
            }
        }
        callback();
    }
}
exports.QuadTransformStream = QuadTransformStream;
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