webfilewriter_base.h revision 58537e28ecd584eab876aee8be7156509866d23a 
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 CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
6#define CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
7
8#include "base/platform_file.h"
9#include "content/common/content_export.h"
10#include "third_party/WebKit/public/platform/WebFileWriter.h"
11#include "url/gurl.h"
12
13namespace WebKit {
14class WebFileWriterClient;
15class WebURL;
16}
17
18namespace content {
19
20class CONTENT_EXPORT WebFileWriterBase
21    : public NON_EXPORTED_BASE(WebKit::WebFileWriter) {
22 public:
23  WebFileWriterBase(const GURL& path, WebKit::WebFileWriterClient* client);
24  virtual ~WebFileWriterBase();
25
26  // WebFileWriter implementation
27  virtual void truncate(long long length);
28  virtual void write(long long position, const WebKit::WebString& id);
29  virtual void cancel();
30
31  // DEPRECATED: see crbug/174200
32  virtual void write(long long position, const WebKit::WebURL& blobURL);
33
34 protected:
35  // This calls DidSucceed() or DidFail() based on the value of |error_code|.
36  void DidFinish(base::PlatformFileError error_code);
37
38  void DidWrite(int64 bytes, bool complete);
39  void DidSucceed();
40  void DidFail(base::PlatformFileError error_code);
41
42  // Derived classes must provide these methods to asynchronously perform
43  // the requested operation, and they must call the appropiate DidSomething
44  // method upon completion and as progress is made in the Write case.
45  virtual void DoTruncate(const GURL& path, int64 offset) = 0;
46  virtual void DoWriteDeprecated(const GURL& path,
47                                 const GURL& blob_url,
48                                 int64 offset) = 0;
49  virtual void DoWrite(const GURL& path,
50                       const std::string& blob_id,
51                       int64 offset) = 0;
52  virtual void DoCancel() = 0;
53
54 private:
55  enum OperationType {
56    kOperationNone,
57    kOperationWrite,
58    kOperationTruncate
59  };
60
61  enum CancelState {
62    kCancelNotInProgress,
63    kCancelSent,
64    kCancelReceivedWriteResponse,
65  };
66
67  void FinishCancel();
68
69  GURL path_;
70  WebKit::WebFileWriterClient* client_;
71  OperationType operation_;
72  CancelState cancel_state_;
73};
74
75}  // namespace content
76
77#endif  // CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
78