webkit/fileapi/webfilewriter_base.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_FILEAPI_WEBFILEWRITER_BASE_H_
   6 #define WEBKIT_FILEAPI_WEBFILEWRITER_BASE_H_
   7
   8 #include "base/platform_file.h"
   9 #include "googleurl/src/gurl.h"
  10 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFileWriter.h"
  11 #include "webkit/fileapi/fileapi_export.h"
  12
  13 namespace WebKit {
  14 class WebFileWriterClient;
  15 class WebURL;
  16 }
  17
  18 namespace fileapi {
  19
  20 class FILEAPI_EXPORT WebFileWriterBase
  21     : public NON_EXPORTED_BASE(WebKit::WebFileWriter) {
  22  public:
  23   WebFileWriterBase(
  24       const GURL& path, WebKit::WebFileWriterClient* client);
  25   virtual ~WebFileWriterBase();
  26
  27   // WebFileWriter implementation
  28   virtual void truncate(long long length);
  29   virtual void write(long long position, const WebKit::WebURL& blobURL);
  30   virtual void cancel();
  31
  32  protected:
  33   // Derived classes must provide these methods to asynchronously perform
  34   // the requested operation, and they must call the appropiate DidSomething
  35   // method upon completion and as progress is made in the Write case.
  36   virtual void DoTruncate(const GURL& path, int64 offset) = 0;
  37   virtual void DoWrite(const GURL& path, const GURL& blob_url,
  38                        int64 offset) = 0;
  39   virtual void DoCancel() = 0;
  40
  41   void DidSucceed();
  42   void DidFail(base::PlatformFileError error_code);
  43   void DidWrite(int64 bytes, bool complete);
  44
  45  private:
  46   enum OperationType {
  47     kOperationNone,
  48     kOperationWrite,
  49     kOperationTruncate
  50   };
  51
  52   enum CancelState {
  53     kCancelNotInProgress,
  54     kCancelSent,
  55     kCancelReceivedWriteResponse,
  56   };
  57
  58   void FinishCancel();
  59
  60   GURL path_;
  61   WebKit::WebFileWriterClient* client_;
  62   OperationType operation_;
  63   CancelState cancel_state_;
  64 };
  65
  66 }  // namespace fileapi
  67
  68 #endif  // WEBKIT_FILEAPI_WEBFILEWRITER_BASE_H_