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1 #pragma once |
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2 |
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3 #include <string> |
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4 #include <sstream> |
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5 #include <iostream> |
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6 #include <vector> |
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7 #include <locale> |
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8 #include <codecvt> |
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9 |
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10 #include "../include/typedefs.h" |
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11 #include "../include/DataTypeReader.h" |
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12 #include "../include/DataTypeReader.h" |
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13 #include "format.h" |
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14 |
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15 namespace relpipe { |
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16 namespace reader { |
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17 |
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18 /** |
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19 * The prototype does not recognize any encoding, |
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20 * it just works with c++ strings in encoding default to given platform. |
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21 * In the real implementation of relational pipes, there will be DataTypes for particular encodings. |
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22 */ |
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23 class StringDataTypeReader : public DataTypeReader<string_t> { |
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24 private: |
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25 IntegerDataTypeReader integerType; |
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26 std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings. |
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27 public: |
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28 |
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29 StringDataTypeReader() : DataTypeReader<string_t>(DATA_TYPE_ID_STRING, DATA_TYPE_CODE_STRING) { |
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30 } |
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31 |
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32 string_t readValue(std::istream &input) override { |
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33 integer_t length = integerType.readValue(input); |
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34 // TODO: check maximum length of single field |
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35 // if (length > 4000) throw RelpipeException("data too long", EXIT_CODE_DATA_ERROR); |
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36 std::vector<char> buf(length); |
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37 input.read(buf.data(), length); |
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38 if (input.good()) { |
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39 return convertor.from_bytes(std::string(buf.data(), length)); |
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40 } else { |
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41 throw RelpipeReaderException(L"Error while reading string from the stream."); |
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42 } |
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43 } |
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44 |
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45 string_t toString(const string_t &value) override { |
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46 return value; |
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47 } |
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48 |
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49 }; |
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50 |
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51 } |
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52 } |