@comunica/actor-rdf-resolve-quad-pattern-hdt/lib/HdtIterator.js

A hdt rdf-resolve-quad-pattern actor

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.HdtIterator = void 0;
const asynciterator_1 = require("asynciterator");
class HdtIterator extends asynciterator_1.BufferedIterator {
    constructor(hdtDocument, subject, predicate, object, options) {
        super(options || { autoStart: false });
        this.hdtDocument = hdtDocument;
        this.subject = subject;
        this.predicate = predicate;
        this.object = object;
        this.position = options && options.offset || 0;
        this.hdtDocument.countTriples(this.subject, this.predicate, this.object)
            .then((searchResult) => {
            this.setProperty('metadata', { totalItems: searchResult.totalCount });
        })
            .catch(error => this.destroy(error));
    }
    _read(count, done) {
        if (this.hdtDocument.closed) {
            this.close();
            return done();
        }
        this.hdtDocument.searchTriples(this.subject, this.predicate, this.object, { offset: this.position, limit: count })
            .then((searchResult) => {
            searchResult.triples.forEach(t => this._push(t));
            if (searchResult.triples.length < count) {
                this.close();
            }
            done();
        })
            .catch(error => {
            this.emit('error', error);
            return done();
        });
        this.position += count;
    }
}
exports.HdtIterator = HdtIterator;
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