src/src/direct/JsonProvider.js

   1 /**
   2  * @class Ext.direct.JsonProvider
   3  *
   4  * A base provider for communicating using JSON. This is an abstract class
   5  * and should not be instanced directly.
   6  * @abstract
   7  */
   8
   9 Ext.define('Ext.direct.JsonProvider', {
  10     extend: 'Ext.direct.Provider',
  11
  12     alias: 'direct.jsonprovider',
  13
  14     uses: ['Ext.direct.ExceptionEvent'],
  15
  16     /**
  17      * Parse the JSON response.
  18      * @private
  19      * @param {Object} response The XHR response object.
  20      * @return {Object} The data in the response.
  21      */
  22     parseResponse: function(response) {
  23         if (!Ext.isEmpty(response.responseText)) {
  24             if (Ext.isObject(response.responseText)) {
  25                 return response.responseText;
  26             }
  27             return Ext.decode(response.responseText);
  28         }
  29         return null;
  30     },
  31
  32     /**
  33      * Creates a set of events based on the XHR response.
  34      * @private
  35      * @param {Object} response The XHR response.
  36      * @return {Ext.direct.Event[]} An array of {@link Ext.direct.Event} objects.
  37      */
  38     createEvents: function(response) {
  39         var data = null,
  40             events = [],
  41             i = 0,
  42             ln, event;
  43
  44         try {
  45             data = this.parseResponse(response);
  46         } catch(e) {
  47             event = Ext.create('Ext.direct.ExceptionEvent', {
  48                 data: e,
  49                 xhr: response,
  50                 code: Ext.direct.Manager.exceptions.PARSE,
  51                 message: 'Error parsing json response: \n\n ' + data
  52             });
  53             return [event];
  54         }
  55
  56         if (Ext.isArray(data)) {
  57             for (ln = data.length; i < ln; ++i) {
  58                 events.push(this.createEvent(data[i]));
  59             }
  60         } else {
  61             events.push(this.createEvent(data));
  62         }
  63         return events;
  64     },
  65
  66     /**
  67      * Create an event from a response object.
  68      * @param {Object} response The XHR response object.
  69      * @return {Ext.direct.Event} The event.
  70      */
  71     createEvent: function(response) {
  72         return Ext.create('direct.' + response.type, response);
  73     }
  74 });