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40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
#pragma once
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#include <IO/ReadBufferFromFileBase.h>
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namespace DB
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{
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/// Delegates all reads to underlying buffer. Doesn't have own memory.
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class ReadBufferFromFileDecorator : public ReadBufferFromFileBase
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{
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public:
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explicit ReadBufferFromFileDecorator(std::unique_ptr<SeekableReadBuffer> impl_);
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ReadBufferFromFileDecorator(std::unique_ptr<SeekableReadBuffer> impl_, const String & file_name_);
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std::string getFileName() const override;
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off_t getPosition() override;
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off_t seek(off_t off, int whence) override;
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bool nextImpl() override;
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bool isWithFileSize() const { return dynamic_cast<const WithFileSize *>(impl.get()) != nullptr; }
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const ReadBuffer & getWrappedReadBuffer() const { return *impl; }
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ReadBuffer & getWrappedReadBuffer() { return *impl; }
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bool isIntegratedWithFilesystemCache() const override { return impl->isIntegratedWithFilesystemCache(); }
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size_t getFileSize() override;
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protected:
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std::unique_ptr<SeekableReadBuffer> impl;
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String file_name;
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};
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}
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