ClickHouse/dbms/include/DB/IO/ReadBufferFromFile.h

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#pragma once
#include <fcntl.h>
#include <DB/IO/ReadBufferFromFileDescriptor.h>
namespace DB
{
/** Принимает имя файла. Самостоятельно открывает и закрывает файл.
*/
class ReadBufferFromFile : public ReadBufferFromFileDescriptor
{
private:
std::string file_name;
public:
ReadBufferFromFile(const std::string & file_name_, size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE)
: ReadBufferFromFileDescriptor(-1, buf_size), file_name(file_name_)
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{
fd = open(file_name.c_str(), O_RDONLY);
if (-1 == fd)
throwFromErrno("Cannot open file " + file_name, errno == ENOENT ? ErrorCodes::FILE_DOESNT_EXIST : ErrorCodes::CANNOT_OPEN_FILE);
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}
virtual ~ReadBufferFromFile()
{
if (0 != close(fd))
throwFromErrno("Cannot close file " + file_name, ErrorCodes::CANNOT_CLOSE_FILE);
}
virtual std::string getFileName()
{
return file_name;
}
};
}