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#pragma once
#include <IO/WriteBufferFromFileDecorator.h>
#include <Interpreters/Cache/FileSegment.h>
#include <IO/IReadableWriteBuffer.h>
namespace DB
{
class FileSegment;
class WriteBufferToFileSegment : public WriteBufferFromFileDecorator, public IReadableWriteBuffer
{
public:
explicit WriteBufferToFileSegment(FileSegment * file_segment_);
explicit WriteBufferToFileSegment(FileSegmentsHolderPtr segment_holder);
void nextImpl() override;
~WriteBufferToFileSegment() override;
private:
std::shared_ptr<ReadBuffer> getReadBufferImpl() override;
/// Reference to the file segment in segment_holder if owned by this WriteBufferToFileSegment
/// or to the external file segment passed to the constructor
FileSegment * file_segment;
/// Empty if file_segment is not owned by this WriteBufferToFileSegment
FileSegmentsHolderPtr segment_holder;
};
}
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