webfilewriter_base.h revision f2477e01787aa58f445919b809d89e252beef54f 
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 blink {
14class WebFileWriterClient;
15class WebURL;
16}
17
18namespace content {
19
20class CONTENT_EXPORT WebFileWriterBase
21    : public NON_EXPORTED_BASE(blink::WebFileWriter) {
22 public:
23  WebFileWriterBase(const GURL& path, blink::WebFileWriterClient* client);
24  virtual ~WebFileWriterBase();
25
26  // WebFileWriter implementation
27  virtual void truncate(long long length);
28  virtual void write(long long position, const blink::WebString& id);
29  virtual void cancel();
30
31 protected:
32  // This calls DidSucceed() or DidFail() based on the value of |error_code|.
33  void DidFinish(base::PlatformFileError error_code);
34
35  void DidWrite(int64 bytes, bool complete);
36  void DidSucceed();
37  void DidFail(base::PlatformFileError error_code);
38
39  // Derived classes must provide these methods to asynchronously perform
40  // the requested operation, and they must call the appropiate DidSomething
41  // method upon completion and as progress is made in the Write case.
42  virtual void DoTruncate(const GURL& path, int64 offset) = 0;
43  virtual void DoWrite(const GURL& path,
44                       const std::string& blob_id,
45                       int64 offset) = 0;
46  virtual void DoCancel() = 0;
47
48 private:
49  enum OperationType {
50    kOperationNone,
51    kOperationWrite,
52    kOperationTruncate
53  };
54
55  enum CancelState {
56    kCancelNotInProgress,
57    kCancelSent,
58    kCancelReceivedWriteResponse,
59  };
60
61  void FinishCancel();
62
63  GURL path_;
64  blink::WebFileWriterClient* client_;
65  OperationType operation_;
66  CancelState cancel_state_;
67};
68
69}  // namespace content
70
71#endif  // CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
72