examples/hoofbeats/javascripts/library.js

   1 /* vi: set et sw=4 ts=4 si: */
   2 /*
   3  * Copyright (c) 2012, Intel Corporation.
   4  *
   5  * This program is licensed under the terms and conditions of the
   6  * Apache License, version 2.0.  The full text of the Apache License is at
   7  * http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  */
  10
  11 (function(win, $) {
  12     var library = function() {
  13         // Private stuff
  14
  15         var _priv = {
  16             initialized: false,
  17             deferred: undefined,
  18             fetchCount: 100,
  19             fetchOffset: 0,
  20             oneTime: false,
  21             mediaItems: [],
  22             resolveBackend: MusicBrainz,
  23
  24             errorCB: function(error) {
  25                 console.log("HoofbeatsLibrary.errorCB: " + error.name);
  26                 this.deferred.reject();
  27                 throw new Error(error.name);
  28             },
  29
  30             findCB: function(items) {
  31                 items.forEach(function(item, index, items) {
  32                     _priv.mediaItems.push(item);
  33                     if (_priv.resolveBackend !== undefined) {
  34                         _priv.resolveBackend.getArtist(item.artists[0]).done(
  35                             function(data) {
  36                                 console.log(
  37                                     "HoofbeatsLibrary.findCB: " +
  38                                     "item resolved on " + _priv.resolveBackend.name() +
  39                                     ": " + data.name);
  40                             }
  41                         );
  42                     }
  43                 });
  44
  45                 if (items.length == _priv.fetchCount && !_priv.oneTime) {
  46                     // There *might* be more items.
  47                     _priv.fetchOffset += _priv.fetchCount;
  48                     tizen.content.find(
  49                         _priv.findCB.bind(this),
  50                         _priv.errorCB.bind(this),
  51                         null,
  52                         _priv.typeFilter,
  53                         null,
  54                         _priv.fetchCount,
  55                         _priv.fetchOffset);
  56                 } else {
  57                     _priv.deferred.resolve();
  58                 }
  59             }
  60         }; // _priv
  61
  62
  63         // Public stuff
  64         return {
  65             initialize: function() {
  66                 if (_priv.initialized)
  67                     return;
  68
  69                 if (win.tizen === undefined) {
  70                     throw Error("You need the Tizen web API  to run Hoofbeats.");
  71                 }
  72
  73                 _priv.audioTypeFilter = new tizen.AttributeFilter(
  74                     "type", "EXACTLY", "AUDIO");
  75                 _priv.videoTypeFilter = new tizen.AttributeFilter(
  76                     "type", "EXACTLY", "VIDEO");
  77                 _priv.typeFilter = new tizen.CompositeFilter(
  78                     "UNION", [_priv.audioTypeFilter, _priv.videoTypeFilter]);
  79             },
  80
  81             scan: function(options) {
  82                 var opts = options || {};
  83                 if (opts.resolveBackend !== MusicBrainz) {
  84                     _priv.resolveBackend = opts.resolveBackend;
  85                 }
  86
  87                 _priv.deferred = new $.Deferred();
  88                 this.initialize();
  89
  90                 _priv.mediaItems = [];
  91                 _priv.fetchOffset = 0;
  92
  93                 if (opts.count !== undefined) {
  94                     _priv.fetchCount = opts.count;
  95                     _priv.oneTime = true;
  96                 }
  97
  98                 tizen.content.find(
  99                     _priv.findCB.bind(this),
 100                     _priv.errorCB.bind(this),
 101                     null,
 102                     _priv.typeFilter,
 103                     null,
 104                     _priv.fetchCount,
 105                     _priv.fetchOffset);
 106
 107                 return _priv.deferred.promise();
 108             },
 109
 110             item: function(id) {
 111                 var ret;
 112
 113                 _priv.mediaItems.forEach(function(item, index, items) {
 114                     if (item.id == id)
 115                         ret = item;
 116                 });
 117
 118                 return ret;
 119             },
 120
 121             // Some simple getters
 122             getInitialized: function() { return _priv.initialized; },
 123             getItems: function() { return _priv.mediaItems; },
 124             getSize: function() { return _priv.mediaItems.length; },
 125             getResolve: function() {return _priv.resolveBackend !== undefined; }
 126         };
 127     };
 128
 129     win.HoofbeatsLibrary = library;
 130 }(window, jQuery));