text: // Copyright (c) 2013 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.
  
  #ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_
  #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_
  
  #include <string>
  
  #include "base/callback.h"
  #include "base/files/file_path.h"
  #include "base/memory/ref_counted.h"
  #include "base/memory/scoped_ptr.h"
  #include "chrome/browser/media_galleries/media_galleries_preferences.h"
  #include "storage/browser/fileapi/file_system_backend.h"
  #include "storage/browser/fileapi/task_runner_bound_observer_list.h"
  
  namespace base {
  class SequencedTaskRunner;
  }
  
  namespace storage {
  class FileSystemURL;
  }
  
  namespace net {
  class URLRequest;
  }
  
  class MediaPathFilter;
  class DeviceMediaAsyncFileUtil;
  
  class MediaFileSystemBackend : public storage::FileSystemBackend {
   public:
    static const char kMediaTaskRunnerName[];
  
    MediaFileSystemBackend(
        const base::FilePath& profile_path,
        base::SequencedTaskRunner* media_task_runner);
    ~MediaFileSystemBackend() override;
  
    static bool CurrentlyOnMediaTaskRunnerThread();
    static scoped_refptr<base::SequencedTaskRunner> MediaTaskRunner();
  
    // Construct the mount point for the gallery specified by |pref_id| in
    // the profile located in |profile_path|.
    static std::string ConstructMountName(const base::FilePath& profile_path,
                                          const std::string& extension_id,
                                          MediaGalleryPrefId pref_id);
  
    static bool AttemptAutoMountForURLRequest(
        const net::URLRequest* url_request,
        const storage::FileSystemURL& filesystem_url,
        const std::string& storage_domain,
        const base::Callback<void(base::File::Error result)>& callback);
  
    // FileSystemBackend implementation.
    bool CanHandleType(storage::FileSystemType type) const override;
    void Initialize(storage::FileSystemContext* context) override;
    void ResolveURL(const storage::FileSystemURL& url,
                    storage::OpenFileSystemMode mode,
                    const OpenFileSystemCallback& callback) override;
    storage::AsyncFileUtil* GetAsyncFileUtil(
        storage::FileSystemType type) override;
    storage::WatcherManager* GetWatcherManager(
        storage::FileSystemType type) override;
    storage::CopyOrMoveFileValidatorFactory* GetCopyOrMoveFileValidatorFactory(
        storage::FileSystemType type,
        base::File::Error* error_code) override;
    storage::FileSystemOperation* CreateFileSystemOperation(
        const storage::FileSystemURL& url,
        storage::FileSystemContext* context,
        base::File::Error* error_code) const override;
    bool SupportsStreaming(const storage::FileSystemURL& url) const override;
    bool HasInplaceCopyImplementation(
        storage::FileSystemType type) const override;
    scoped_ptr<storage::FileStreamReader> CreateFileStreamReader(
        const storage::FileSystemURL& url,
        int64 offset,
        int64 max_bytes_to_read,
        const base::Time& expected_modification_time,
        storage::FileSystemContext* context) const override;
    scoped_ptr<storage::FileStreamWriter> CreateFileStreamWriter(
        const storage::FileSystemURL& url,
        int64 offset,
        storage::FileSystemContext* context) const override;
    storage::FileSystemQuotaUtil* GetQuotaUtil() override;
    const storage::UpdateObserverList* GetUpdateObservers(
        storage::FileSystemType type) const override;
    const storage::ChangeObserverList* GetChangeObservers(
        storage::FileSystemType type) const override;
    const storage::AccessObserverList* GetAccessObservers(
        storage::FileSystemType type) const override;
  
   private:
    // Store the profile path. We need this to create temporary snapshot files.
    const base::FilePath profile_path_;
  
    scoped_refptr<base::SequencedTaskRunner> media_task_runner_;
  
    scoped_ptr<MediaPathFilter> media_path_filter_;
    scoped_ptr<storage::CopyOrMoveFileValidatorFactory>
        media_copy_or_move_file_validator_factory_;
  
    scoped_ptr<storage::AsyncFileUtil> native_media_file_util_;
    scoped_ptr<DeviceMediaAsyncFileUtil> device_media_async_file_util_;
  #if defined(OS_WIN) || defined(OS_MACOSX)
    scoped_ptr<storage::AsyncFileUtil> picasa_file_util_;
    scoped_ptr<storage::AsyncFileUtil> itunes_file_util_;
  #endif  // defined(OS_WIN) || defined(OS_MACOSX)
  #if defined(OS_MACOSX)
    scoped_ptr<storage::AsyncFileUtil> iphoto_file_util_;
  #endif  // defined(OS_MACOSX)
  
    DISALLOW_COPY_AND_ASSIGN(MediaFileSystemBackend);
  };
  
  #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_
  