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      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 
     25   // Destroys the MTPDeviceTaskHelper object created by
     26   // CreateDeviceTaskHelper().
     27   // |storage_name| specifies the name of the storage device.
     28   void DestroyDeviceTaskHelper(const std::string& storage_name);
     29 
     30   // Gets the MTPDeviceTaskHelper object associated with the device storage.
     31   // |storage_name| specifies the name of the storage device.
     32   // Return NULL if the |storage_name| is no longer valid (e.g. because the
     33   // corresponding storage device is detached, etc).
     34   MTPDeviceTaskHelper* GetDeviceTaskHelper(const std::string& storage_name);
     35 
     36  private:
     37   friend struct base::DefaultLazyInstanceTraits<MTPDeviceTaskHelperMapService>;
     38 
     39   // Key: Storage name.
     40   // Value: MTPDeviceTaskHelper object.
     41   typedef std::map<std::string, MTPDeviceTaskHelper*> TaskHelperMap;
     42 
     43   // Get access to this class using GetInstance() method.
     44   MTPDeviceTaskHelperMapService();
     45   ~MTPDeviceTaskHelperMapService();
     46 
     47   // Mapping of |storage_name| and MTPDeviceTaskHelper*.
     48   // TaskHelperMap owns MTPDeviceTaskHelper objects.
     49   TaskHelperMap task_helper_map_;
     50 
     51   DISALLOW_COPY_AND_ASSIGN(MTPDeviceTaskHelperMapService);
     52 };
     53 
     54 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_TASK_HELPER_MAP_SERVICE_H_
     55