author | František Kučera <franta-hg@frantovo.cz> |
Mon, 03 Sep 2018 23:41:29 +0200 | |
branch | v_0 |
changeset 26 | 8ae93a43fed2 |
parent 24 | 00fe696500c5 |
child 27 | a64afb2d24c9 |
permissions | -rw-r--r-- |
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#pragma once |
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#include <iostream> |
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#include <vector> |
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#include "typedefs.h" |
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#include "TypeId.h" |
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namespace relpipe { |
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namespace writer { |
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class RelationalWriter { |
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public: |
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virtual ~RelationalWriter() = default; |
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/** |
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* @param typeCode string type code as defined in Specification |
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* @return numeric id of given type |
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* @throws RelpipeWriterException on unsupported typeCode |
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*/ |
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virtual TypeId toTypeId(const string_t typeCode) = 0; |
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/** |
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* TODO: use custom extensible class instead of std::pair |
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* |
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* @param name name of the relation (table) |
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* @param attributes list of attributes (columns) containing their names and types |
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* @param writeHeader header might be omitted – when appending new records to a stream alreaready containing the header |
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*/ |
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virtual void startRelation(string_t name, std::vector<std::pair<string_t, TypeId>> attributes, boolean_t writeHeader) = 0; |
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/** |
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* Writes a single attribute. |
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* @param value string representation of value of given attribute type as defined in Specification |
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*/ |
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virtual void writeAttribute(const string_t& value) = 0; |
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// TODO: fluent interface? |
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// TODO: << operator? |
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// TODO: write bitmap + attribute: |
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// virtual void writeBitmap(...) = 0; |
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// virtual void writeAttribute(string_t attribute) = 0; |
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/** |
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* Writes a single attribute. |
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* @param value raw pointer to the value in format of given attribute type as defined in Specification |
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* @param type used as a safety mechanism to avoid wrong pointer interpretation; |
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* should be called in this way: writeAttribute(&value, typeid(value)); |
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* if the type does not match, the RelpipeWriterException is thrown |
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*/ |
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virtual void writeAttribute(const void* value, const std::type_info& type) = 0; |
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}; |
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} |
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} |