chrome/browser/media_galleries/linux/mtp_device_task_helper_map_service.h

   1 // Copyright 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 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_TASK_HELPER_MAP_SERVICE_H_
   6 #define CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_TASK_HELPER_MAP_SERVICE_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/lazy_instance.h"
  12
  13 class MTPDeviceTaskHelper;
  14
  15 // MTPDeviceTaskHelperMapService manages MTPDeviceTaskHelper objects.
  16 // MTPDeviceTaskHelperMapService lives on the UI thread.
  17 class MTPDeviceTaskHelperMapService {
  18  public:
  19   static MTPDeviceTaskHelperMapService* GetInstance();
  20
  21   // Creates and returns the MTPDeviceTaskHelper object for the storage device
  22   // specified by the |storage_name|.
  23   MTPDeviceTaskHelper* CreateDeviceTaskHelper(const std::string& storage_name,
  24                                               const bool read_only);
  25
  26   // Destroys the MTPDeviceTaskHelper object created by
  27   // CreateDeviceTaskHelper().
  28   // |storage_name| specifies the name of the storage device.
  29   void DestroyDeviceTaskHelper(const std::string& storage_name,
  30                                const bool read_only);
  31
  32   // Gets the MTPDeviceTaskHelper object associated with the device storage.
  33   // |storage_name| specifies the name of the storage device.
  34   // Return NULL if the |storage_name| is no longer valid (e.g. because the
  35   // corresponding storage device is detached, etc).
  36   MTPDeviceTaskHelper* GetDeviceTaskHelper(const std::string& storage_name,
  37                                            const bool read_only);
  38
  39  private:
  40   friend struct base::DefaultLazyInstanceTraits<MTPDeviceTaskHelperMapService>;
  41
  42   // A key to be used in TaskHelperMap.
  43   typedef std::string MTPDeviceTaskHelperKey;
  44
  45   // Gets a key from |storage_name| and |read_only|.
  46   static MTPDeviceTaskHelperKey GetMTPDeviceTaskHelperKey(
  47       const std::string& storage_name,
  48       const bool read_only);
  49
  50   // Key: A combined value with storage_name and read_only.
  51   // Value: MTPDeviceTaskHelper object.
  52   typedef std::map<MTPDeviceTaskHelperKey, MTPDeviceTaskHelper*> TaskHelperMap;
  53
  54   // Get access to this class using GetInstance() method.
  55   MTPDeviceTaskHelperMapService();
  56   ~MTPDeviceTaskHelperMapService();
  57
  58   // Mapping of |storage_name| and MTPDeviceTaskHelper*.
  59   // TaskHelperMap owns MTPDeviceTaskHelper objects.
  60   TaskHelperMap task_helper_map_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(MTPDeviceTaskHelperMapService);
  63 };
  64
  65 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_TASK_HELPER_MAP_SERVICE_H_