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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
#define CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
#include "base/platform_file.h"
#include "content/common/content_export.h"
#include "third_party/WebKit/public/platform/WebFileWriter.h"
#include "url/gurl.h"
namespace blink {
class WebFileWriterClient;
class WebURL;
}
namespace content {
class CONTENT_EXPORT WebFileWriterBase
: public NON_EXPORTED_BASE(blink::WebFileWriter) {
public:
WebFileWriterBase(const GURL& path, blink::WebFileWriterClient* client);
virtual ~WebFileWriterBase();
// WebFileWriter implementation
virtual void truncate(long long length);
virtual void write(long long position, const blink::WebString& id);
virtual void cancel();
protected:
// This calls DidSucceed() or DidFail() based on the value of |error_code|.
void DidFinish(base::PlatformFileError error_code);
void DidWrite(int64 bytes, bool complete);
void DidSucceed();
void DidFail(base::PlatformFileError error_code);
// Derived classes must provide these methods to asynchronously perform
// the requested operation, and they must call the appropiate DidSomething
// method upon completion and as progress is made in the Write case.
virtual void DoTruncate(const GURL& path, int64 offset) = 0;
virtual void DoWrite(const GURL& path,
const std::string& blob_id,
int64 offset) = 0;
virtual void DoCancel() = 0;
private:
enum OperationType {
kOperationNone,
kOperationWrite,
kOperationTruncate
};
enum CancelState {
kCancelNotInProgress,
kCancelSent,
kCancelReceivedWriteResponse,
};
void FinishCancel();
GURL path_;
blink::WebFileWriterClient* client_;
OperationType operation_;
CancelState cancel_state_;
};
} // namespace content
#endif // CONTENT_CHILD_FILEAPI_WEBFILEWRITER_BASE_H_
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