examples/hoofbeats/javascripts/library.js

   1 /* vi: set et sw=4 ts=4 si: */
   2 (function(win, $) {
   3     var library = function() {
   4         // Private stuff
   5
   6         var _priv = {
   7             initialized: false,
   8             deferred: undefined,
   9             fetchCount: 100,
  10             fetchOffset: 0,
  11             oneTime: false,
  12             mediaItems: [],
  13             resolveBackend: MusicBrainz,
  14
  15             errorCB: function(error) {
  16                 console.log("HoofbeatsLibrary.errorCB: " + error.name);
  17                 this.deferred.reject();
  18                 throw new Error(error.name);
  19             },
  20
  21             findCB: function(items) {
  22                 items.forEach(function(item, index, items) {
  23                     _priv.mediaItems.push(item);
  24                     if (_priv.resolveBackend !== undefined) {
  25                         _priv.resolveBackend.getArtist(item.artists[0]).done(
  26                             function(data) {
  27                                 console.log(
  28                                     "HoofbeatsLibrary.findCB: " +
  29                                     "item resolved on " + _priv.resolveBackend.name() +
  30                                     ": " + data.name);
  31                             }
  32                         );
  33                     }
  34                 });
  35
  36                 if (items.length == _priv.fetchCount && !_priv.oneTime) {
  37                     // There *might* be more items.
  38                     _priv.fetchOffset += _priv.fetchCount;
  39                     tizen.content.find(
  40                         _priv.findCB.bind(this),
  41                         _priv.errorCB.bind(this),
  42                         null,
  43                         _priv.typeFilter,
  44                         null,
  45                         _priv.fetchCount,
  46                         _priv.fetchOffset);
  47                 } else {
  48                     _priv.deferred.resolve();
  49                 }
  50             }
  51         }; // _priv
  52
  53
  54         // Public stuff
  55         return {
  56             initialize: function() {
  57                 if (_priv.initialized)
  58                     return;
  59
  60                 if (win.tizen === undefined) {
  61                     throw Error("You need the Tizen web API  to run Hoofbeats.");
  62                 }
  63
  64                 _priv.audioTypeFilter = new tizen.AttributeFilter(
  65                     "type", "EXACTLY", "AUDIO");
  66                 _priv.videoTypeFilter = new tizen.AttributeFilter(
  67                     "type", "EXACTLY", "VIDEO");
  68                 _priv.typeFilter = new tizen.CompositeFilter(
  69                     "UNION", [_priv.audioTypeFilter, _priv.videoTypeFilter]);
  70             },
  71
  72             scan: function(options) {
  73                 var opts = options || {};
  74                 if (opts.resolveBackend !== MusicBrainz) {
  75                     _priv.resolveBackend = opts.resolveBackend;
  76                 }
  77
  78                 _priv.deferred = new $.Deferred();
  79                 this.initialize();
  80
  81                 _priv.mediaItems = [];
  82                 _priv.fetchOffset = 0;
  83
  84                 if (opts.count !== undefined) {
  85                     _priv.fetchCount = opts.count;
  86                     _priv.oneTime = true;
  87                 }
  88
  89                 tizen.content.find(
  90                     _priv.findCB.bind(this),
  91                     _priv.errorCB.bind(this),
  92                     null,
  93                     _priv.typeFilter,
  94                     null,
  95                     _priv.fetchCount,
  96                     _priv.fetchOffset);
  97
  98                 return _priv.deferred.promise();
  99             },
 100
 101             item: function(id) {
 102                 var ret;
 103
 104                 _priv.mediaItems.forEach(function(item, index, items) {
 105                     if (item.id == id)
 106                         ret = item;
 107                 });
 108
 109                 return ret;
 110             },
 111
 112             // Some simple getters
 113             getInitialized: function() { return _priv.initialized; },
 114             getItems: function() { return _priv.mediaItems; },
 115             getSize: function() { return _priv.mediaItems.length; },
 116             getResolve: function() {return _priv.resolveBackend !== undefined; }
 117         };
 118     };
 119
 120     win.HoofbeatsLibrary = library;
 121 }(window, jQuery));