Facebook Connect plugin

ionic-v1
1

ng-cordova.js has a plugin that connects with FB. The code is as follows.

// install :
// link :

‘use strict’;
angular.module(‘ngCordova.plugins.facebookConnect’, [])
.provider(’$cordovaFacebookConnectProvider’, [

function () {
  this.FacebookAppId = undefined;

  this.setFacebookAppId = function (id) {
    this.FacebookAppId = id;
  };

  this.$get = [
    function () {
      var FbAppId = this.FacebookAppId;
      return {
        getFacebookAppId: function () {
          return FbAppId;
        }
      };
    }];
}

])
.factory(’$cordovaFacebookConnect’, [’$q’, ‘$cordova’, function ($q, $cordova) {

return {
  init: function (appId) {
    if (!window.cordova) {
      facebookConnectPlugin.browserInit(appId);
    }
  },

  login: function (o) {
    alert("fb");
    this.init($cordova.getFacebookAppId());

    var q = $q.defer();
    facebookConnectPlugin.login(o,
      function (res) {
        q.resolve(res);
      }, function (res) {
        q.reject(res);
      });

    return q.promise;
  },

  showDialog: function (o) {

    var q = $q.defer();
    facebookConnectPlugin.showDialog(o,
      function (res) {
        q.resolve(res);
      },
      function (err) {
        q.reject(err);
      });

    return q.promise;
  },

  api: function (path, permission) {

    var q = $q.defer();
    facebookConnectPlugin.api(path, permission,
      function (res) {
        q.resolve(res);
      },
      function (err) {
        q.reject(err);
      });

    return q.promise;
  },

  getAccessToken: function () {
    var q = $q.defer();
    facebookConnectPlugin.getAccessToken(function (res) {
        q.resolve(res);
      },
      function (err) {
        q.reject(err);
      });

    return q.promise;
  },

  getLoginStatus: function () {
    var q = $q.defer();
    facebookConnectPlugin.getLoginStatus(function (res) {
        q.resolve(res);
      },
      function (err) {
        q.reject(err);
      });

    return q.promise;

  },

  logout: function () {
    var q = $q.defer();
    facebookConnectPlugin.logout(function (res) {
        q.resolve(res);
      },
      function (err) {
        q.reject(err);
      });

    return q.promise;

  }
};

}]);

Can anyone let make me understand the above code.? Or tell me an example how to use them??