content/child/fileapi/webfilewriter_base.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 CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
   6 #define CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
   7
   8 #include "base/files/file.h"
   9 #include "content/common/content_export.h"
  10 #include "third_party/WebKit/public/platform/WebFileWriter.h"
  11 #include "url/gurl.h"
  12
  13 namespace blink {
  14 class WebFileWriterClient;
  15 class WebURL;
  16 }
  17
  18 namespace content {
  19
  20 class 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::File::Error error_code);
  34
  35   void DidWrite(int64 bytes, bool complete);
  36   void DidSucceed();
  37   void DidFail(base::File::Error 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_