lwm2m/lib/slidingWindow.js

Library for developing servers and client of OMA Lightweight M2M

/*
 * Copyright 2014 Telefonica Investigación y Desarrollo, S.A.U
 *
 * This file is part of node-lwm2m
 *
 * node-lwm2m is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 *
 * node-lwm2m is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with node-lwm2m.
 * If not, seehttp://www.gnu.org/licenses/.
 *
 * For those usages not covered by the GNU Affero General Public License
 * please contact with::[contacto@tid.es]
 */

'use strict';

function createSlidingWindow(size) {
  var window = {
    data: new Array(size),
    header: 0,
  };

  function containNumber(number) {
    if (window.data.indexOf(number) < 0) {
      return false;
    } else {
      return true;
    }
  }

  function pushNumber(number) {
    window.data[window.header] = number;
    window.header = (window.header++)%window.data.length;
  }

  return {
    contains: containNumber,
    push: pushNumber,
  };
}

module.exports = createSlidingWindow;