Hotword: Check for the existence of a speaker model.

chrome/browser/resources/hotword/training_manager.js

 // Copyright 2014 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.
 
 cr.define('hotword', function() {
   'use strict';
 
   /**
    * Class used to manage speaker training. Starts a hotwording session
    * if training is on, and automatically restarts the detector when a
@@ skipping 10 matching lines @@
      */
     this.finalizedSpeakerModelListener_ =
         this.handleFinalizeSpeakerModel_.bind(this);
 
     hotword.BaseSessionManager.call(this,
                                     stateManager,
                                     hotword.constants.SessionSource.TRAINING);
   }
 
   /**
-   * Handles a success event on mounting the file system event.
+   * Handles a success event on mounting the file system event and deletes
+   * the user data files.
    * @param {FileSystem} fs The FileSystem object.
    * @private
    */
-  TrainingManager.onRequestFileSystemSuccess_ = function(fs) {
+  TrainingManager.deleteFiles_ = function(fs) {
     fs.root.getFile(hotword.constants.SPEAKER_MODEL_FILE_NAME, {create: false},
         TrainingManager.deleteFile_, TrainingManager.fileErrorHandler_);
 
     for (var i = 0; i < hotword.constants.NUM_TRAINING_UTTERANCES; ++i) {
       fs.root.getFile(hotword.constants.UTTERANCE_FILE_PREFIX + i +
           hotword.constants.UTTERANCE_FILE_EXTENSION,
           {create: false},
           TrainingManager.deleteFile_, TrainingManager.fileErrorHandler_);
     }
   };
@@ skipping 20 matching lines @@
   /**
    * Handles a failure event on mounting the file system event.
    * @param {FileError} e The FileError object.
    * @private
    */
   TrainingManager.fileErrorHandler_ = function(e) {
       hotword.debug('File error: ' + e.code);
   };
 
   /**
+   * Handles a failure event on checking for the existence of the speaker model.
+   * @param {FileError} e The FileError object.
+   * @private
+   */
+  TrainingManager.sendNoSpeakerModelResponse_ = function(e) {
+    chrome.hotwordPrivate.speakerModelExistsResult(false);
+  };
+
+  /**
+   * Handles a success event on mounting the file system and checks for the
+   * existence of the speaker model.
+   * @param {FileSystem} fs The FileSystem object.
+   * @private
+   */
+  TrainingManager.speakerModelExists_ = function(fs) {
+    fs.root.getFile(hotword.constants.SPEAKER_MODEL_FILE_NAME, {create: false},
+        TrainingManager.sendSpeakerModelExistsResponse_,
+        TrainingManager.sendNoSpeakerModelResponse_);
+  };
+
+  /**
+   * Sends a response through the HotwordPrivateApi indicating whether
+   * the speaker model exists.
+   * @param {FileEntry} fileEntry The FileEntry object.
+   * @private
+   */
+  TrainingManager.sendSpeakerModelExistsResponse_ = function(fileEntry) {
+    if (fileEntry.isFile) {
+      hotword.debug('File found: ' + fileEntry.fullPath);
+      if (hotword.DEBUG || window.localStorage['hotword.DEBUG']) {
+        fileEntry.getMetadata(function(md) {
+          hotword.debug('File size: ' + md.size);
+        });
+      }
+    }
+    chrome.hotwordPrivate.speakerModelExistsResult(fileEntry.isFile);
+  };
+
+  /**
    * Handles a request to delete the speaker model.
    */
   TrainingManager.handleDeleteSpeakerModel = function() {
     window.webkitRequestFileSystem(PERSISTENT,
         hotword.constants.FILE_SYSTEM_SIZE_BYTES,
-        TrainingManager.onRequestFileSystemSuccess_,
+        TrainingManager.deleteFiles_,
         TrainingManager.fileErrorHandler_);
   };
 
+  /**
+   * Handles a request for the speaker model existence.
+   */
+  TrainingManager.handleSpeakerModelExists = function() {
+    window.webkitRequestFileSystem(PERSISTENT,
+        hotword.constants.FILE_SYSTEM_SIZE_BYTES,
+        TrainingManager.speakerModelExists_,
+        TrainingManager.fileErrorHandler_);
+  };
+
   TrainingManager.prototype = {
     __proto__: hotword.BaseSessionManager.prototype,
 
     /** @override */
      enabled: function() {
        return this.stateManager.isTrainingEnabled();
      },
 
     /** @override */
     updateListeners: function() {
@@ skipping 50 matching lines @@
     handleSpeakerModelSaved_: function() {
       if (this.enabled())
         chrome.hotwordPrivate.notifySpeakerModelSaved();
     },
   };
 
   return {
     TrainingManager: TrainingManager
   };
 });