graphdb/lib/service/download-service.js

Javascript client library supporting GraphDB and RDF4J REST API.

"use strict";

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var Service = require('./service');
var HttpRequestBuilder = require('../http/http-request-builder');
var ServiceRequest = require('./service-request');
var PATH_STATEMENTS = require('./service-paths').PATH_STATEMENTS;
var LoggingUtils = require('../logging/logging-utils');
var TermConverter = require('../model/term-converter');

/**
 * Service for downloading data via {@link GetStatementsPayload}.
 *
 * @author Mihail Radkov
 * @author Svilen Velikov
 */
var DownloadService = /*#__PURE__*/function (_Service) {
  function DownloadService() {
    _classCallCheck(this, DownloadService);
    return _callSuper(this, DownloadService, arguments);
  }
  _inherits(DownloadService, _Service);
  return _createClass(DownloadService, [{
    key: "download",
    value:
    /**
     * Fetch rdf data from statements endpoint using provided parameters.
     *
     * The request is configured so that expected response should be a readable
     * stream.
     *
     * Provided request params will be automatically converted to N-Triples if
     * they are not already encoded as such.
     *
     * @param {GetStatementsPayload} payload is an object holding request params
     *
     * @return {ServiceRequest} a service request that will resolve to a readable
     * stream to which the client can subscribe and consume the emitted strings
     * depending on the provided response type as soon as they are available.
     */
    function download(payload) {
      var _this = this;
      var requestBuilder = HttpRequestBuilder.httpGet(PATH_STATEMENTS).addAcceptHeader(payload.getResponseType()).setResponseType('stream').setParams({
        subj: TermConverter.toNTripleValue(payload.getSubject()),
        pred: TermConverter.toNTripleValue(payload.getPredicate()),
        obj: TermConverter.toNTripleValue(payload.getObject()),
        context: TermConverter.toNTripleValues(payload.getContext()),
        infer: payload.getInference()
      });
      return new ServiceRequest(requestBuilder, function () {
        return _this.httpRequestExecutor(requestBuilder).then(function (response) {
          _this.logger.debug(LoggingUtils.getLogPayload(response, requestBuilder.getParams()), 'Downloaded data');
          return response.getData();
        });
      });
    }

    /**
     * @inheritDoc
     */
  }, {
    key: "getServiceName",
    value: function getServiceName() {
      return 'DownloadService';
    }
  }]);
}(Service);
module.exports = DownloadService;