src/webkit/browser/fileapi/file_system_file_stream_reader.h

   1 // Copyright (c) 2012 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 WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
   6 #define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
   7
   8 #include "base/bind.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/platform_file.h"
  11 #include "base/time/time.h"
  12 #include "webkit/browser/blob/file_stream_reader.h"
  13 #include "webkit/browser/fileapi/file_system_url.h"
  14 #include "webkit/browser/webkit_storage_browser_export.h"
  15 #include "webkit/common/blob/shareable_file_reference.h"
  16
  17 namespace base {
  18 class FilePath;
  19 class SequencedTaskRunner;
  20 }
  21
  22 namespace fileapi {
  23
  24 class FileSystemContext;
  25
  26 // Generic FileStreamReader implementation for FileSystem files.
  27 // Note: This generic implementation would work for any filesystems but
  28 // remote filesystem should implement its own reader rather than relying
  29 // on FileSystemOperation::GetSnapshotFile() which may force downloading
  30 // the entire contents for remote files.
  31 class WEBKIT_STORAGE_BROWSER_EXPORT_PRIVATE FileSystemFileStreamReader
  32     : public NON_EXPORTED_BASE(webkit_blob::FileStreamReader) {
  33  public:
  34   virtual ~FileSystemFileStreamReader();
  35
  36   // FileStreamReader overrides.
  37   virtual int Read(net::IOBuffer* buf, int buf_len,
  38                    const net::CompletionCallback& callback) OVERRIDE;
  39   virtual int64 GetLength(
  40       const net::Int64CompletionCallback& callback) OVERRIDE;
  41
  42  private:
  43   friend class webkit_blob::FileStreamReader;
  44   friend class FileSystemFileStreamReaderTest;
  45
  46   FileSystemFileStreamReader(FileSystemContext* file_system_context,
  47                              const FileSystemURL& url,
  48                              int64 initial_offset,
  49                              const base::Time& expected_modification_time);
  50
  51   int CreateSnapshot(const base::Closure& callback,
  52                      const net::CompletionCallback& error_callback);
  53   void DidCreateSnapshot(
  54       const base::Closure& callback,
  55       const net::CompletionCallback& error_callback,
  56       base::PlatformFileError file_error,
  57       const base::PlatformFileInfo& file_info,
  58       const base::FilePath& platform_path,
  59       const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref);
  60
  61   scoped_refptr<FileSystemContext> file_system_context_;
  62   FileSystemURL url_;
  63   const int64 initial_offset_;
  64   const base::Time expected_modification_time_;
  65   scoped_ptr<webkit_blob::FileStreamReader> local_file_reader_;
  66   scoped_refptr<webkit_blob::ShareableFileReference> snapshot_ref_;
  67   bool has_pending_create_snapshot_;
  68   base::WeakPtrFactory<FileSystemFileStreamReader> weak_factory_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(FileSystemFileStreamReader);
  71 };
  72
  73 }  // namespace fileapi
  74
  75 #endif  // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_