Hotword: Check for the existence of a speaker model.

chrome/browser/resources/hotword/training_manager.js

Index: chrome/browser/resources/hotword/training_manager.js
diff --git a/chrome/browser/resources/hotword/training_manager.js b/chrome/browser/resources/hotword/training_manager.js
index 61c68c2b89efa9af2d68560f546d61218196aac5..15752eb1590cb1c0fc5f4960e807c4d900ba18b9 100644
--- a/chrome/browser/resources/hotword/training_manager.js
+++ b/chrome/browser/resources/hotword/training_manager.js
@@ -28,11 +28,12 @@ cr.define('hotword', function() {
   }
 
   /**
-   * 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_);
 
@@ -73,12 +74,61 @@ cr.define('hotword', function() {
   };
 
   /**
+   * 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_);
   };