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

Fragments an RDF dataset into multiple parts

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.FragmentationStrategyStreamAdapter = void 0;
const node_stream_1 = require("node:stream");
/**
 * An abstract implementation of a fragmentation strategy.
 */
class FragmentationStrategyStreamAdapter {
    async fragment(quadStream, quadSink) {
        // eslint-disable-next-line ts/no-this-alias
        const self = this;
        const transform = new node_stream_1.Transform({
            objectMode: true,
            transform(quad, encoding, callback) {
                self.handleQuad(quad, quadSink).then(() => callback(), callback);
            },
        });
        await new Promise((resolve, reject) => {
            quadStream.on('error', error => transformed.emit('error', error));
            const transformed = quadStream.pipe(transform);
            // Enter flow-mode, but not need to attach a data-listener
            transformed.resume();
            transformed.on('error', reject);
            transformed.on('end', resolve);
        });
        await this.flush(quadSink);
    }
    // eslint-disable-next-line unused-imports/no-unused-vars
    async flush(quadSink) {
        // Do nothing, implementors of this class can optionally override this
    }
}
exports.FragmentationStrategyStreamAdapter = FragmentationStrategyStreamAdapter;
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