relpipe/relpipe-lib-reader.cpp: src/StringDataTypeReader.h@c87e9c84f7aa (annotated)

7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	1	#pragma once
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	2
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	3	#include <string>
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	4	#include <sstream>
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	5	#include <iostream>
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	6	#include <vector>
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	7	#include <locale>
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	8	#include <codecvt>
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	9
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	10	#include "../include/typedefs.h"
c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	11	#include "../include/DataTypeReader.h"
c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	12	#include "../include/DataTypeReader.h"
c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	13	#include "format.h"
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	14
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	15	namespace relpipe {
c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	16	namespace reader {
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	17
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	18	/**
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	19	* The prototype does not recognize any encoding,
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	20	* it just works with c++ strings in encoding default to given platform.
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	21	* In the real implementation of relational pipes, there will be DataTypes for particular encodings.
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	22	*/
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	23	class StringDataTypeReader : public DataTypeReader<string_t> {
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	24	private:
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	25	IntegerDataTypeReader integerType;
c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	26	std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	27	public:
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	28
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	29	StringDataTypeReader() : DataTypeReader<string_t>(DATA_TYPE_ID_STRING, DATA_TYPE_CODE_STRING) {
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	30	}
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	31
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	32	string_t readValue(std::istream &input) override {
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	33	integer_t length = integerType.readValue(input);
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	34	// TODO: check maximum length of single field
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	35	// if (length > 4000) throw RelpipeException("data too long", EXIT_CODE_DATA_ERROR);
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	36	std::vector<char> buf(length);
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	37	input.read(buf.data(), length);
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	38	if (input.good()) {
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	39	return convertor.from_bytes(std::string(buf.data(), length));
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	40	} else {
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	41	throw RelpipeReaderException(L"Error while reading string from the stream.");
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	42	}
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	43	}
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	44
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	45	string_t toString(const string_t &value) override {
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	46	return value;
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	47	}
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	48
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	49	};
489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	50
8 c87e9c84f7aa reader only reads + refactoring František Kučera <franta-hg@frantovo.cz> parents: 7 diff changeset	51	}
7 489e52138771 add data type and catalog classes from the prototype František Kučera <franta-hg@frantovo.cz> parents: diff changeset	52	}

author	František Kučera <franta-hg@frantovo.cz>
	Sun, 15 Jul 2018 00:15:09 +0200
branch	v_0
changeset 8	c87e9c84f7aa
parent 7	src/StringDataType.h@489e52138771
child 9	517888868e55
permissions	-rw-r--r--