chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_directories.js

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * Wallpaper file system quota.
   7  */
   8 /** @const */ var WallpaperQuota = 1024 * 1024 * 100;
   9
  10 var wallpaperDirectories = null;
  11
  12 /**
  13  * Manages custom wallpaper related directories in wallpaper's sandboxed
  14  * FileSystem.
  15  * @constructor
  16  */
  17 function WallpaperDirectories() {
  18   this.wallpaperDirs_ = {};
  19   this.wallpaperDirs_[Constants.WallpaperDirNameEnum.ORIGINAL] = null;
  20   this.wallpaperDirs_[Constants.WallpaperDirNameEnum.THUMBNAIL] = null;
  21 }
  22
  23 /**
  24  * Gets WallpaperDirectories instance. In case is hasn't been initialized, a new
  25  * instance is created.
  26  * @return {WallpaperDirectories} A WallpaperDirectories instance.
  27  */
  28 WallpaperDirectories.getInstance = function() {
  29   if (wallpaperDirectories === null)
  30     wallpaperDirectories = new WallpaperDirectories();
  31   return wallpaperDirectories;
  32 };
  33
  34 WallpaperDirectories.prototype = {
  35   /**
  36    * Returns all custom wallpaper related directory entries.
  37    */
  38   get wallpaperDirs() {
  39     return this.wallpaperDirs_;
  40   },
  41
  42   /**
  43    * If dirName is not requested, gets the directory entry of dirName and cache
  44    * the result. Calls success callback if success.
  45    * @param {string} dirName The directory name of requested directory entry.
  46    * @param {function(DirectoryEntry):void} success Call success with requested
  47    *     DirectoryEntry.
  48    * @param {function(e):void} failure Call failure when failed to get the
  49    *     requested directory.
  50    */
  51   requestDir: function(dirName, success, failure) {
  52     if (dirName != Constants.WallpaperDirNameEnum.ORIGINAL &&
  53         dirName != Constants.WallpaperDirNameEnum.THUMBNAIL) {
  54       console.error('Error: Unknow directory name.');
  55       var e = new Error();
  56       e.code = FileError.NOT_FOUND_ERR;
  57       failure(e);
  58       return;
  59     }
  60     var self = this;
  61     window.webkitRequestFileSystem(window.PERSISTENT, WallpaperQuota,
  62                                    function(fs) {
  63       fs.root.getDirectory(dirName, {create: true}, function(dirEntry) {
  64         self.wallpaperDirs_[dirName] = dirEntry;
  65         success(dirEntry);
  66       }, failure);
  67     }, failure);
  68   },
  69
  70   /**
  71    * Gets DirectoryEntry associated with dirName from cache. If not in cache try
  72    * to request it from FileSystem.
  73    * @param {string} dirName The directory name of requested directory entry.
  74    * @param {function(DirectoryEntry):void} success Call success with requested
  75    *     DirectoryEntry.
  76    * @param {function(e):void} failure Call failure when failed to get the
  77    *     requested directory.
  78    */
  79   getDirectory: function(dirName, success, failure) {
  80     if (this.wallpaperDirs[dirName])
  81       success(this.wallpaperDirs[dirName]);
  82     else
  83       this.requestDir(dirName, success, failure);
  84   }
  85 };