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      1 <!DOCTYPE html>
      2 <!--
      3 Copyright (c) 2015 The Chromium Authors. All rights reserved.
      4 Use of this source code is governed by a BSD-style license that can be
      5 found in the LICENSE file.
      6 -->
      7 
      8 <link rel="import" href="/tracing/base/base.html">
      9 
     10 <script>
     11 'use strict';
     12 
     13 tr.exportTo('tr.ui.tracks', function() {
     14 
     15   /**
     16    * ContainerToTrackMap is a class to handle building and accessing a map
     17    * between an EventContainer's stableId and its handling track.
     18    *
     19    * @constructor
     20    */
     21   function ContainerToTrackMap() {
     22     this.stableIdToTrackMap_ = {};
     23   }
     24 
     25   ContainerToTrackMap.prototype = {
     26     addContainer: function(container, track) {
     27       if (!track)
     28         throw new Error('Must provide a track.');
     29       this.stableIdToTrackMap_[container.stableId] = track;
     30     },
     31 
     32     clear: function() {
     33       this.stableIdToTrackMap_ = {};
     34     },
     35 
     36     getTrackByStableId: function(stableId) {
     37       return this.stableIdToTrackMap_[stableId];
     38     }
     39   };
     40 
     41   return {
     42     ContainerToTrackMap: ContainerToTrackMap
     43   };
     44 });
     45 </script>
     46