webkit/chromeos/fileapi/remote_file_stream_writer.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_CHROMEOS_FILEAPI_REMOTE_FILE_STREAM_WRITER_H_
   6 #define WEBKIT_CHROMEOS_FILEAPI_REMOTE_FILE_STREAM_WRITER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/files/file_path.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/platform_file.h"
  13 #include "webkit/fileapi/file_stream_writer.h"
  14 #include "webkit/fileapi/file_system_url.h"
  15
  16 namespace net {
  17 class IOBuffer;
  18 }
  19
  20 namespace webkit_blob {
  21 class ShareableFileReference;
  22 }
  23
  24 namespace fileapi {
  25
  26 class RemoteFileSystemProxyInterface;
  27
  28 // FileStreamWriter interface for writing to a file on remote file system.
  29 class RemoteFileStreamWriter : public fileapi::FileStreamWriter {
  30  public:
  31   // Creates a writer for a file on |remote_filesystem| with path url |url|
  32   // (like "filesystem:chrome-extension://id/external/special/drive/...") that
  33   // starts writing from |offset|. When invalid parameters are set, the first
  34   // call to Write() method fails.
  35   RemoteFileStreamWriter(
  36       const scoped_refptr<RemoteFileSystemProxyInterface>& remote_filesystem,
  37       const FileSystemURL& url,
  38       int64 offset);
  39   virtual ~RemoteFileStreamWriter();
  40
  41   // FileWriter override.
  42   virtual int Write(net::IOBuffer* buf, int buf_len,
  43                     const net::CompletionCallback& callback) OVERRIDE;
  44   virtual int Cancel(const net::CompletionCallback& callback) OVERRIDE;
  45   virtual int Flush(const net::CompletionCallback& callback) OVERRIDE;
  46
  47  private:
  48   // Callback function to do the continuation of the work of the first Write()
  49   // call, which tries to open the local copy of the file before writing.
  50   void OnFileOpened(
  51       net::IOBuffer* buf,
  52       int buf_len,
  53       const net::CompletionCallback& callback,
  54       base::PlatformFileError open_result,
  55       const base::FilePath& local_path,
  56       const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref);
  57   // Calls |pending_cancel_callback_|, assuming it is non-null.
  58   void InvokePendingCancelCallback(int result);
  59
  60   scoped_refptr<RemoteFileSystemProxyInterface> remote_filesystem_;
  61   const FileSystemURL url_;
  62   const int64 initial_offset_;
  63   scoped_ptr<fileapi::FileStreamWriter> local_file_writer_;
  64   scoped_refptr<webkit_blob::ShareableFileReference> file_ref_;
  65   bool has_pending_create_snapshot_;
  66   net::CompletionCallback pending_cancel_callback_;
  67
  68   base::WeakPtrFactory<RemoteFileStreamWriter> weak_factory_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(RemoteFileStreamWriter);
  71 };
  72
  73 }  // namespace fileapi
  74
  75 #endif  // WEBKIT_CHROMEOS_FILEAPI_REMOTE_FILE_STREAM_WRITER_H_