author | František Kučera <franta-hg@frantovo.cz> |
Sun, 09 Sep 2018 21:01:17 +0200 | |
branch | v_0 |
changeset 22 | e81019af67dc |
parent 21 | abd3e7f26584 |
child 24 | 6f7acc3b274c |
permissions | -rw-r--r-- |
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#pragma once |
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#include <string> |
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#include <iostream> |
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#include <vector> |
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#include <relpipe/protocol/constants.h> |
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#include "../include/relpipe/reader/typedefs.h" |
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#include "../include/relpipe/reader/RelationalReader.h" |
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#include "../include/relpipe/reader/TypeId.h" |
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#include "../include/relpipe/reader/handlers/RelationalReaderBaseHandler.h" |
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#include "../include/relpipe/reader/handlers/RelationalReaderStringHandler.h" |
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#include "../include/relpipe/reader/handlers/RelationalReaderValueHandler.h" |
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#include "DataTypeReaderBase.h" |
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#include "types/BooleanDataTypeReader.h" |
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#include "types/IntegerDataTypeReader.h" |
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#include "types/StringDataTypeReader.h" |
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namespace relpipe { |
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namespace reader { |
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using namespace relpipe::protocol; |
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using StringHandler = relpipe::reader::handlers::RelationalReaderStringHadler; |
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using ValuesHandler = relpipe::reader::handlers::RelationalReaderValueHadler; |
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class StreamRelationalReader : public RelationalReader { |
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private: |
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std::istream &input; |
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types::BooleanDataTypeReader booleanReader; |
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types::IntegerDataTypeReader integerReader; |
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types::StringDataTypeReader stringReader; |
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std::vector<DataTypeReaderBase*> readers = {&booleanReader, &integerReader, &stringReader}; |
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std::vector<StringHandler*> stringHandlers; |
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std::vector<ValuesHandler*> valuesHandlers; |
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/** |
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* count of columns in the current table |
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*/ |
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integer_t columnCount; |
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/** |
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* number of column (0 = first) that will be written; after writing, the number is increased and prepared for next one |
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*/ |
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integer_t currentColumn; |
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/** |
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* types of columns in the current table |
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*/ |
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std::vector<TypeId> columnTypes; |
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std::vector<string_t> columnNames; |
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std::vector<handlers::AttributeMetadata> columns; |
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/** |
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* TODO: remove? |
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*/ |
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string_t readString(std::istream &input, const TypeId typeId) { |
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for (DataTypeReaderBase* reader : readers) if (reader->supports(typeId)) return reader->readString(input); |
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throw RelpipeReaderException(L"Unsupported data type: " + (int) typeId); |
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} |
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void read(std::istream &input, std::function<void(const void *, const std::type_info&) > handler, const TypeId typeId) { |
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for (DataTypeReaderBase* reader : readers) if (reader->supports(typeId)) return reader->read(input, handler); |
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throw RelpipeReaderException(L"Unsupported data type: " + (int) typeId); |
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} |
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void read(std::istream &input, std::function<void(const string_t&, const void *, const std::type_info&) > handler, const TypeId typeId) { |
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for (DataTypeReaderBase* reader : readers) if (reader->supports(typeId)) return reader->read(input, handler); |
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throw RelpipeReaderException(L"Unsupported data type: " + (int) typeId); |
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} |
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void endOfPipe() { |
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for (StringHandler* handler : stringHandlers) handler->endOfPipe(); |
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for (ValuesHandler* handler : valuesHandlers) handler->endOfPipe(); |
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} |
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public: |
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StreamRelationalReader(std::istream &input) : |
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input(input) { |
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} |
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string_t toTypeCode(const TypeId typeId) override { |
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for (DataTypeReaderBase* reader : readers) if (reader->supports(typeId)) return reader->getTypeCode(); |
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throw RelpipeReaderException(L"Unsupported data type: " + static_cast<integer_t> (typeId)); |
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} |
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void addHandler(StringHandler* handler) override { |
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stringHandlers.push_back(handler); |
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} |
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void addHandler(ValuesHandler* handler) override { |
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valuesHandlers.push_back(handler); |
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} |
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void process() override { |
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while (true) { |
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integer_t dataPart; |
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try { |
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dataPart = integerReader.readValue(input); |
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// output << "dataPart: " << dataPart << endl; |
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} catch (RelpipeReaderException e) { |
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if (input.eof() && input.gcount() == 0) { |
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if (dataPart == DATA_PART_ROW) { |
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// last part was row |
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// input was fully read |
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// we are finished |
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// TODO: printCachedData(output); ??? |
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111 |
endOfPipe(); |
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112 |
return; |
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113 |
} else if (dataPart == DATA_PART_START) { |
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114 |
// Empty relation might be weird but it is valid data. |
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115 |
// Actually, it is not so weird as it looks. |
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116 |
// fwprintf(stderr, L"Warning: The table has no rows. Weird… but OK.\n"); |
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117 |
endOfPipe(); |
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118 |
return; |
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119 |
} else { |
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120 |
// in current format, there is no other data part |
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121 |
// so this will never happen |
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122 |
// but maybe later… |
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123 |
throw RelpipeReaderException(L"Unexpected EOF"); |
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124 |
} |
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125 |
} else if (input.eof()) { |
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126 |
fwprintf(stderr, L"Error: found some unexpected data on the input stream: %d\n", input.gcount()); |
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127 |
throw e; |
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128 |
} else { |
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129 |
// other error |
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130 |
throw e; |
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131 |
} |
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132 |
} |
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133 |
|
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134 |
if (dataPart == DATA_PART_START) { |
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135 |
// Print data of previous table |
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136 |
// TODO: if (values.size() > 0) printCachedData(output); ??? |
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137 |
|
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138 |
// Read table name |
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139 |
string_t tableName = stringReader.readValue(input); |
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140 |
|
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141 |
// Read column count |
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142 |
columnCount = integerReader.readValue(input); |
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143 |
|
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144 |
columnTypes.resize(columnCount); |
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145 |
columnNames.resize(columnCount); |
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146 |
columns.resize(columnCount); |
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147 |
|
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148 |
// Read column names |
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149 |
for (int i = 0; i < columnCount; i++) { |
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150 |
columnNames[i] = stringReader.readValue(input); |
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151 |
} |
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152 |
|
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153 |
// Read column types |
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154 |
for (int i = 0; i < columnCount; i++) { |
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155 |
TypeId typeId = (TypeId) integerReader.readValue(input); // TODO: přetypování OK? |
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156 |
string_t typeCode = toTypeCode(typeId); // validate typeId TODO: je potřeba? |
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157 |
columnTypes[i] = typeId; |
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158 |
|
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159 |
// put together names, type ids and type codes: |
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160 |
columns[i] = {columnNames[i], columnTypes[i], typeCode}; |
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161 |
} |
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162 |
|
21
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163 |
for (StringHandler* handler : stringHandlers) handler->startRelation(tableName, columns); |
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164 |
for (ValuesHandler* handler : valuesHandlers) handler->startRelation(tableName, columns); |
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165 |
|
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166 |
} else if (dataPart == DATA_PART_ROW) { |
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167 |
for (int i = 0; i < columnCount; i++) { |
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168 |
TypeId typeId = columnTypes[i]; |
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169 |
|
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170 |
if (stringHandlers.empty()) { |
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171 |
read(input, [&](const void * rawValue, const std::type_info & typeInfo) { |
21
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172 |
for (ValuesHandler* handler : valuesHandlers) handler->attribute(rawValue, typeInfo); |
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173 |
}, typeId); |
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174 |
} else { |
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175 |
read(input, [&](const string_t& stringValue, const void * rawValue, const std::type_info & typeInfo) { |
21
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176 |
for (StringHandler* handler : stringHandlers) handler->attribute(stringValue); |
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177 |
for (ValuesHandler* handler : valuesHandlers) handler->attribute(rawValue, typeInfo); |
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178 |
}, typeId); |
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179 |
} |
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180 |
} |
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181 |
|
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182 |
} else { |
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183 |
throw RelpipeReaderException(L"Unknown data part"); |
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184 |
} |
17
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185 |
} |
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186 |
|
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187 |
throw RelpipeReaderException(L"Unexpected exception"); // should never happen |
17
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|
188 |
|
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189 |
} |
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190 |
|
14
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191 |
}; |
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|
192 |
|
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193 |
} |
19
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194 |
} |