1 // Copyright (c) 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_FILEAPI_MTP_DEVICE_ASYNC_DELEGATE_H_ 6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_DEVICE_ASYNC_DELEGATE_H_ 7 8 #include "base/callback.h" 9 #include "base/memory/ref_counted.h" 10 #include "base/platform_file.h" 11 #include "webkit/browser/fileapi/async_file_util.h" 12 13 namespace base { 14 class FilePath; 15 } 16 17 namespace chrome { 18 19 // Asynchronous delegate for media transfer protocol (MTP) device to perform 20 // media device isolated file system operations. Class that implements this 21 // delegate does the actual communication with the MTP device. 22 // ScopedMTPDeviceMapEntry class manages the lifetime of the delegate via 23 // MTPDeviceMapService class. Member functions and callbacks runs on the IO 24 // thread. 25 class MTPDeviceAsyncDelegate { 26 public: 27 // A callback to be called when GetFileInfo method call succeeds. 28 typedef base::Callback< 29 void(const base::PlatformFileInfo& file_info)> GetFileInfoSuccessCallback; 30 31 // A callback to be called when ReadDirectory method call succeeds. 32 typedef base::Callback< 33 void(const fileapi::AsyncFileUtil::EntryList& file_list, 34 bool has_more)> ReadDirectorySuccessCallback; 35 36 // A callback to be called when GetFileInfo/ReadDirectory/CreateSnapshot 37 // method call fails. 38 typedef base::Callback< 39 void(base::PlatformFileError error)> ErrorCallback; 40 41 // A callback to be called when CreateSnapshotFile method call succeeds. 42 typedef base::Callback< 43 void(const base::PlatformFileInfo& file_info, 44 const base::FilePath& local_path)> CreateSnapshotFileSuccessCallback; 45 46 // Gets information about the given |file_path| and invokes the appropriate 47 // callback asynchronously when complete. 48 virtual void GetFileInfo( 49 const base::FilePath& file_path, 50 const GetFileInfoSuccessCallback& success_callback, 51 const ErrorCallback& error_callback) = 0; 52 53 // Enumerates the |root| directory contents and invokes the appropriate 54 // callback asynchronously when complete. 55 virtual void ReadDirectory( 56 const base::FilePath& root, 57 const ReadDirectorySuccessCallback& success_callback, 58 const ErrorCallback& error_callback) = 0; 59 60 // Copy the contents of |device_file_path| to |local_path|. Invokes the 61 // appropriate callback asynchronously when complete. 62 virtual void CreateSnapshotFile( 63 const base::FilePath& device_file_path, 64 const base::FilePath& local_path, 65 const CreateSnapshotFileSuccessCallback& success_callback, 66 const ErrorCallback& error_callback) = 0; 67 68 // Called when the 69 // (1) Browser application is in shutdown mode (or) 70 // (2) Last extension using this MTP device is destroyed (or) 71 // (3) Attached MTP device is removed (or) 72 // (4) User revoked the MTP device gallery permission. 73 // Ownership of |MTPDeviceAsyncDelegate| is handed off to the delegate 74 // implementation class by this call. This function should take care of 75 // cancelling all the pending tasks before deleting itself. 76 virtual void CancelPendingTasksAndDeleteDelegate() = 0; 77 78 protected: 79 // Always destruct this object via CancelPendingTasksAndDeleteDelegate(). 80 virtual ~MTPDeviceAsyncDelegate() {} 81 }; 82 83 } // namespace chrome 84 85 #endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_DEVICE_ASYNC_DELEGATE_H_ 86
