content/browser/resources/media/new/player_manager.js

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @fileoverview Keeps track of all the existing
 * PlayerInfo objects and is the entry-point for messages from the backend.
 *
 * The events captured by PlayerManager (add, remove, update) are relayed
 * to the clientRenderer which it can choose to use to modify the UI.
 */
var PlayerManager = (function() {
  'use strict';

  function PlayerManager(clientRenderer) {
    this.players_ = {};
    this.clientRenderer_ = clientRenderer;
  }

  PlayerManager.prototype = {

    /**
     * Adds a player to the list of players to manage.
     */
    addPlayer: function(id) {
      if (this.players_[id]) {
        return;
      }
      // Make the PlayerProperty and add it to the mapping
      this.players_[id] = new PlayerInfo(id);
      this.clientRenderer_.playerAdded(this.players_, this.players_[id]);
    },

    /**
     * Attempts to remove a player from the UI.
     * @param id The ID of the player to remove.
     */
    removePlayer: function(id) {
      delete this.players_[id];
      this.clientRenderer_.playerRemoved(this.players_, this.players_[id]);
    },

    updatePlayerInfoNoRecord: function(id, timestamp, key, value) {
      if (!this.players_[id]) {
        console.error('[updatePlayerInfo] Id ' + id + ' does not exist');
        return;
      }

      this.players_[id].addPropertyNoRecord(timestamp, key, value);
      this.clientRenderer_.playerUpdated(this.players_,
                                         this.players_[id],
                                         key,
                                         value);
    },

    /**
     *
     * @param id The unique ID that identifies the player to be updated.
     * @param timestamp The timestamp of when the change occured.  This
     * timestamp is *not* normalized.
     * @param key The name of the property to be added/changed.
     * @param value The value of the property.
     */
    updatePlayerInfo: function(id, timestamp, key, value) {
      if (!this.players_[id]) {
        console.error('[updatePlayerInfo] Id ' + id + ' does not exist');
        return;
      }

      this.players_[id].addProperty(timestamp, key, value);
      this.clientRenderer_.playerUpdated(this.players_,
                                         this.players_[id],
                                         key,
                                         value);
    }
  };

  return PlayerManager;
}());