meses-messaging/dist/classes/PreviousMessageListQuery.js

Meses messaging SDK in JavaScript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var PreviousMessageListQuery = function () {
  function PreviousMessageListQuery(service, conversationName, next) {
    _classCallCheck(this, PreviousMessageListQuery);

    this._service = service;
    this._conversationName = conversationName;
    this._next = next;
    this._reachEnd = false;
  }

  /**
   * Load some message items ordered by messageId (timestamp)
   * 
   * @param  {Number} items - number of items to load
   * @return {Promise} array of messages if fulfilled.
   */


  _createClass(PreviousMessageListQuery, [{
    key: "load",
    value: function load(items) {
      if (this._reachEnd) return new Promise(function (resolve, reject) {
        resolve([]);
      });

      var service = this._service;
      var conversationName = this._conversationName;
      var next = this._next;

      return new Promise(function (resolve, reject) {
        var _this = this;

        service.getMessages(conversationName, next, items).then(function (result) {
          if (result.nextMessageId == null) _this._reachEnd = true;

          _this._next = result.nextMessageId;
          resolve(result.messages);
        }).catch(function (err) {
          return reject(err);
        });
      }.bind(this));
    }

    /**
     * Predicate for checking whether the query can load more message
     * 
     * @return {Boolean} TRUE if query can load more message
     */

  }, {
    key: "hasMore",
    value: function hasMore() {
      return !this._reachEnd;
    }
  }]);

  return PreviousMessageListQuery;
}();

exports.default = PreviousMessageListQuery;