Move device notification impl out of chrome/browser/media_gallery

chrome/browser/media_gallery/media_storage_util.h

-// Copyright (c) 2012 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.
-
-// chrome::MediaStorageUtil provides information about storage devices attached
-// to the computer.
-
-#ifndef CHROME_BROWSER_MEDIA_GALLERY_MEDIA_STORAGE_UTIL_H_
-#define CHROME_BROWSER_MEDIA_GALLERY_MEDIA_STORAGE_UTIL_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/callback_forward.h"
-#include "base/file_path.h"
-
-namespace chrome {
-
-class MediaStorageUtil {
- public:
-  enum Type {
-    // A removable mass storage device with a DCIM directory.
-    REMOVABLE_MASS_STORAGE_WITH_DCIM,
-    // A removable mass storage device without a DCIM directory.
-    REMOVABLE_MASS_STORAGE_NO_DCIM,
-    // A fixed mass storage device.
-    FIXED_MASS_STORAGE,
-    // A MTP or PTP device.
-    MTP_OR_PTP,
-  };
-
-  typedef base::Callback<void(bool)> BoolCallback;
-  typedef base::Callback<void(FilePath)> FilePathCallback;
-
-  // Returns a device id given properties of the device. A prefix dependent on
-  // |type| is added so |unique_id| need only be unique within the given type.
-  // Returns an empty string if an invalid type is passed in.
-  static std::string MakeDeviceId(Type type, const std::string& unique_id);
-
-  // Extracts the device |type| and |unique_id| from |device_id|. Returns false
-  // if the device_id isn't properly formatted.
-  static bool CrackDeviceId(const std::string& device_id,
-                            Type* type, std::string* unique_id);
-
-  // Looks inside |device_id| to determine if it is a media device
-  // (type is REMOVABLE_MASS_STORAGE_WITH_DCIM or MTP_OR_PTP).
-  static bool IsMediaDevice(const std::string& device_id);
-
-  // Looks inside |device_id| to determine if it is a media device
-  // (type isn't FIXED_MASS_STORAGE).
-  static bool IsRemovableDevice(const std::string& device_id);
-
-  // Determines if the device is attached to the computer.
-  static void IsDeviceAttached(const std::string& device_id,
-                               const BoolCallback& callback);
-
-  // Given |path|, fill in |device_id|, |device_name|, and |relative_path|
-  // (from the root of the device) if they are not NULL.
-  static void GetDeviceInfoFromPath(const FilePath& path,
-                                    std::string* device_id,
-                                    string16* device_name,
-                                    FilePath* relative_path);
-
-  // Get a FilePath for the given |device_id|.  If the device isn't connected
-  // or isn't a mass storage type, the FilePath will be empty.
-  static void FindDevicePathById(const std::string& device_id,
-                                 const FilePathCallback& callback);
-
- protected:
-  typedef void (*GetDeviceInfoFromPathFunction)(const FilePath& path,
-                                                std::string* device_id,
-                                                string16* device_name,
-                                                FilePath* relative_path);
-
-  // Set the implementation of GetDeviceInfoFromPath for testing.
-  static void SetGetDeviceInfoFromPathFunctionForTesting(
-      GetDeviceInfoFromPathFunction function);
-
- private:
-  // All methods are static, this class should not be instantiated.
-  MediaStorageUtil();
-
-  // Per platform implementation.
-  static void GetDeviceInfoFromPathImpl(const FilePath& path,
-                                        std::string* device_id,
-                                        string16* device_name,
-                                        FilePath* relative_path);
-
-  DISALLOW_COPY_AND_ASSIGN(MediaStorageUtil);
-};
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_MEDIA_GALLERY_MEDIA_STORAGE_UTIL_H_