libzotero/lib/Fetcher.js

javascript libZotero

'use strict';

var log = require('./Log.js').Logger('libZotero:Fetcher');

var Fetcher = function Fetcher() {
	var config = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

	var defaultConfig = {
		start: 0,
		limit: 25
	};

	this.config = Z.extend({}, defaultConfig, config);
	this.hasMore = true;

	this.results = [];
	this.totalResults = null;
	this.resultInfo = {};
};

Fetcher.prototype.next = function () {
	var _this = this;

	if (this.hasMore == false) {
		return Promise.resolve(null);
	}

	var urlconfig = Z.extend({}, this.config);
	var p = Zotero.net.queueRequest({ url: urlconfig });
	p.then(function (response) {
		if (response.parsedLinks.hasOwnProperty('next')) {
			_this.hasMore = true;
		} else {
			_this.hasMore = false;
		}

		_this.results = _this.results.concat(response.data);
		_this.totalResults = response.totalResults;

		return response;
	});

	var nconfig = Z.extend({}, urlconfig);
	nconfig.start = nconfig.start + nconfig.limit;
	this.config = nconfig;
	return p;
};

Fetcher.prototype.fetchAll = function () {
	var _this2 = this;

	var results = [];
	var tryNext = function tryNext() {
		if (_this2.hasMore) {
			return _this2.next().then(function (response) {
				results = results.concat(response.data);
			}).then(tryNext);
		} else {
			return Promise.resolve(results);
		}
	};

	return tryNext();
};

module.exports = Fetcher;