author | František Kučera <franta-hg@frantovo.cz> |
Sat, 21 Jul 2018 23:01:47 +0200 | |
branch | v_0 |
changeset 12 | 640e88aedf8f |
parent 11 | 27bc67e7c80f |
child 13 | e7234dd45166 |
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 "../include/typedefs.h" |
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#include "../include/RelationalWriter.h" |
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#include "format.h" |
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#include "DataTypeWriterBase.h" |
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#include "types/BooleanDataTypeWriter.h" |
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#include "types/IntegerDataTypeWriter.h" |
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#include "types/StringDataTypeWriter.h" |
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namespace relpipe { |
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namespace writer { |
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class StreamRelationalWriter : public RelationalWriter { |
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private: |
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std::ostream &output; |
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types::BooleanDataTypeWriter booleanWriter; |
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types::IntegerDataTypeWriter integerWriter; |
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types::StringDataTypeWriter stringWriter; |
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vector<DataTypeWriterBase*> writers = {&booleanWriter, &integerWriter, &stringWriter}; |
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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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* types of columns in the current table |
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*/ |
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vector<integer_t> columnTypes; |
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void writeString(const string_t &stringValue, const integer_t typeId) { |
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for (DataTypeWriterBase* writer : writers) if (writer->supports(typeId)) return writer->writeString(output, stringValue); |
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throw RelpipeWriterException(L"Unsupported data type: " + typeId); |
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} |
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public: |
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StreamRelationalWriter(std::ostream &output) : |
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output(output) { |
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} |
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integer_t toTypeId(const string_t typeCode) override { |
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for (DataTypeWriterBase* writer : writers) if (writer->supports(typeCode)) return writer->getTypeId(); |
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throw RelpipeWriterException(L"Unsupported data type: " + typeCode); |
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} |
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string_t toTypeCode(const integer_t typeId) override { |
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for (DataTypeWriterBase* writer : writers) if (writer->supports(typeId)) return writer->getTypeCode(); |
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throw RelpipeWriterException(L"Unsupported data type: " + typeId); |
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} |
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void startRelation(string_t name, std::vector<std::pair<string_t, string_t> > attributes, boolean_t writeHeader) override { |
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string_t tableName = name; |
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columnCount = attributes.size(); |
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// Write table name and column count: |
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integerWriter.writeValue(output, DATA_PART_START); |
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stringWriter.writeValue(output, tableName); |
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integerWriter.writeValue(output, columnCount); |
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columnTypes.clear(); |
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columnTypes.resize(columnCount); |
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// Write column names: |
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for (size_t c = 0; c < columnCount; c++) { |
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wstring columnName = attributes[c].first; |
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stringWriter.writeValue(output, columnName); |
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} |
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// Write column types: |
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for (size_t c = 0; c < columnCount; c++) { |
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wstring typeCode = attributes[c].second; |
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integer_t typeId = toTypeId(typeCode); |
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integerWriter.writeValue(output, typeId); |
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columnTypes[c] = typeId; |
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} |
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} |
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void writeRecord(std::vector<string_t> attributes) override { |
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// FIXME: check vector size |
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for (size_t c = 0; c < columnCount; c++) { |
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// TODO: support multiple rows in a single method call? |
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if (c % columnCount == 0) { |
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integerWriter.writeValue(output, DATA_PART_ROW); |
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} |
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wstring stringValue = attributes[c]; |
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integer_t typeId = columnTypes[c % columnCount]; |
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writeString(stringValue, typeId); |
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} |
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} |
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}; |
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} |
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} |