Upstream version 10.38.222.0
[platform/framework/web/crosswalk.git] / src / webkit / browser / fileapi / quota / open_file_handle_context.h
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 WEBKIT_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_
6 #define WEBKIT_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_
7
8 #include <map>
9
10 #include "base/basictypes.h"
11 #include "base/files/file_path.h"
12 #include "base/memory/ref_counted.h"
13 #include "base/memory/weak_ptr.h"
14 #include "url/gurl.h"
15 #include "webkit/browser/webkit_storage_browser_export.h"
16 #include "webkit/common/fileapi/file_system_types.h"
17
18 namespace fileapi {
19
20 class QuotaReservationBuffer;
21
22 // This class represents a underlying file of a managed FileSystem file.
23 // The instance keeps alive while at least one consumer keeps an open file
24 // handle.
25 // This class is usually manipulated only via OpenFileHandle.
26 class OpenFileHandleContext : public base::RefCounted<OpenFileHandleContext> {
27  public:
28   OpenFileHandleContext(const base::FilePath& platform_path,
29                         QuotaReservationBuffer* reservation_buffer);
30
31   // Updates the max written offset and returns the amount of growth.
32   int64 UpdateMaxWrittenOffset(int64 offset);
33
34   void AddAppendModeWriteAmount(int64 amount);
35
36   const base::FilePath& platform_path() const {
37     return platform_path_;
38   }
39
40   int64 GetEstimatedFileSize() const;
41   int64 GetMaxWrittenOffset() const;
42
43  private:
44   friend class base::RefCounted<OpenFileHandleContext>;
45   virtual ~OpenFileHandleContext();
46
47   int64 initial_file_size_;
48   int64 maximum_written_offset_;
49   int64 append_mode_write_amount_;
50   base::FilePath platform_path_;
51
52   scoped_refptr<QuotaReservationBuffer> reservation_buffer_;
53
54   base::SequenceChecker sequence_checker_;
55
56   DISALLOW_COPY_AND_ASSIGN(OpenFileHandleContext);
57 };
58
59 }  // namespace fileapi
60
61 #endif  // WEBKIT_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_