text: cordova.define("cordova-plugin-battery-status.battery", function(require, exports, module) { /*
   *
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   *
  */
  
  /**
   * This class contains information about the current battery status.
   * @constructor
   */
  var cordova = require('cordova');
  var exec = require('cordova/exec');
  
  var STATUS_CRITICAL = 5;
  var STATUS_LOW = 20;
  
  var Battery = function () {
      this._level = null;
      this._isPlugged = null;
      // Create new event handlers on the window (returns a channel instance)
      this.channels = {
          batterystatus: cordova.addWindowEventHandler('batterystatus'),
          batterylow: cordova.addWindowEventHandler('batterylow'),
          batterycritical: cordova.addWindowEventHandler('batterycritical')
      };
      for (var key in this.channels) {
          this.channels[key].onHasSubscribersChange = Battery.onHasSubscribersChange;
      }
  };
  
  function handlers () {
      return battery.channels.batterystatus.numHandlers +
          battery.channels.batterylow.numHandlers +
          battery.channels.batterycritical.numHandlers;
  }
  
  /**
   * Event handlers for when callbacks get registered for the battery.
   * Keep track of how many handlers we have so we can start and stop the native battery listener
   * appropriately (and hopefully save on battery life!).
   */
  Battery.onHasSubscribersChange = function () {
    // If we just registered the first handler, make sure native listener is started.
      if (this.numHandlers === 1 && handlers() === 1) {
          exec(battery._status, battery._error, 'Battery', 'start', []);
      } else if (handlers() === 0) {
          exec(null, null, 'Battery', 'stop', []);
      }
  };
  
  /**
   * Callback for battery status
   *
   * @param {Object} info            keys: level, isPlugged
   */
  Battery.prototype._status = function (info) {
  
      if (info) {
          if (battery._level !== info.level || battery._isPlugged !== info.isPlugged) {
  
              if (info.level === null && battery._level !== null) {
                  return; // special case where callback is called because we stopped listening to the native side.
              }
  
              // Something changed. Fire batterystatus event
              cordova.fireWindowEvent('batterystatus', info);
  
              if (!info.isPlugged) { // do not fire low/critical if we are charging. issue: CB-4520
                  // note the following are NOT exact checks, as we want to catch a transition from
                  // above the threshold to below. issue: CB-4519
                  if (battery._level > STATUS_CRITICAL && info.level <= STATUS_CRITICAL) {
                      // Fire critical battery event
                      cordova.fireWindowEvent('batterycritical', info);
                  } else if (battery._level > STATUS_LOW && info.level <= STATUS_LOW) {
                      // Fire low battery event
                      cordova.fireWindowEvent('batterylow', info);
                  }
              }
              battery._level = info.level;
              battery._isPlugged = info.isPlugged;
          }
      }
  };
  
  /**
   * Error callback for battery start
   */
  Battery.prototype._error = function (e) {
      console.log('Error initializing Battery: ' + e);
  };
  
  var battery = new Battery(); // jshint ignore:line
  
  module.exports = battery;
  
  });
  