#pragma once
#include <string>
#include <sstream>
#include <iostream>
#include <vector>
#include <locale>
#include <codecvt>
#include "../include/typedefs.h"
#include "../include/DataTypeReader.h"
#include "../include/DataTypeReader.h"
#include "format.h"
namespace relpipe {
namespace reader {
/**
* The prototype does not recognize any encoding,
* it just works with c++ strings in encoding default to given platform.
* In the real implementation of relational pipes, there will be DataTypes for particular encodings.
*/
class StringDataTypeReader : public DataTypeReader<string_t> {
private:
IntegerDataTypeReader integerType;
std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
public:
StringDataTypeReader() : DataTypeReader<string_t>(DATA_TYPE_ID_STRING, DATA_TYPE_CODE_STRING) {
}
string_t readValue(std::istream &input) override {
integer_t length = integerType.readValue(input);
// TODO: check maximum length of single field
// if (length > 4000) throw RelpipeException("data too long", EXIT_CODE_DATA_ERROR);
std::vector<char> buf(length);
input.read(buf.data(), length);
if (input.good()) {
return convertor.from_bytes(std::string(buf.data(), length));
} else {
throw RelpipeReaderException(L"Error while reading string from the stream.");
}
}
string_t toString(const string_t &value) override {
return value;
}
};
}
}