examples/hoofbeats/javascripts/library.js

   1 /* vi: set et sw=4 ts=4 si: */
   2 (function(win, $) {
   3     var library = function() {
   4         // For readability:
   5         this.initialized = false;
   6
   7         this.fetchCount = 100;
   8         this.fetchOffset = 0;
   9         this.oneTime = false;
  10         this.mediaItems = [];
  11
  12         this.initialize = function() {
  13             if (this.initialized)
  14                 return;
  15
  16             if (win.tizen === undefined) {
  17                 throw Error("You need the Tizen web API  to run Hoofbeats.");
  18             }
  19
  20             this.audioTypeFilter = new tizen.AttributeFilter(
  21                 "type", "EXACTLY", "AUDIO");
  22             this.videoTypeFilter = new tizen.AttributeFilter(
  23                 "type", "EXACTLY", "VIDEO");
  24             this.typeFilter = new tizen.CompositeFilter(
  25                 "UNION", [this.audioTypeFilter, this.videoTypeFilter]);
  26         };
  27
  28         this.scan = function(count) {
  29             this.deferred = new $.Deferred();
  30             this.initialize()
  31
  32             this.mediaItems = [];
  33             this.fetchOffset = 0;
  34
  35             if (count !== undefined) {
  36                 this.fetchCount = count;
  37                 this.oneTime = true;
  38             }
  39
  40             tizen.content.find(
  41                 this.findCB.bind(this),
  42                 this.errorCB.bind(this),
  43                 null,
  44                 this.typeFilter,
  45                 null,
  46                 this.fetchCount,
  47                 this.fetchOffset);
  48
  49             return this.deferred.promise();
  50         };
  51
  52         this.errorCB = function(error) {
  53             console.log("HoofbeatsLibrary.errorCB: " + error.name);
  54             this.deferred.reject();
  55             throw new Error(error.name);
  56         };
  57
  58         this.findCB = function(items) {
  59             var self = this;
  60
  61             items.forEach(function(item, index, items) {
  62                 self.mediaItems.push(item);
  63                 win.MusicBrainz.getArtist(item.artists[0]).done(function(data) {
  64                     console.log(
  65                         "HoofbeatsLibrary.findCB: " +
  66                         "item resolved on MusicBrainz: " +
  67                         data.name);
  68                 });
  69             });
  70
  71             if (items.length == this.fetchCount && !this.oneTime) {
  72                 // There *might* be more items.
  73                 this.fetchOffset += this.fetchCount;
  74                 tizen.content.find(
  75                     this.findCB.bind(this),
  76                     this.errorCB.bind(this),
  77                     null,
  78                     this.typeFilter,
  79                     null,
  80                     this.fetchCount,
  81                     this.fetchOffset);
  82             } else {
  83                 self.deferred.resolve();
  84             }
  85         };
  86     };
  87
  88     library.prototype = {
  89         set initialized(value) {this._initialized = value; },
  90         get initialized() { return this._initialized; },
  91         get items() { return this.mediaItems; },
  92         get size() { return this.mediaItems.length; }
  93     };
  94
  95     win.HoofbeatsLibrary = library;
  96 }(window, jQuery));