#pragma once
#include <string>
#include <iostream>
#include <vector>
#include "typedefs.h"
#include "TypeId.h"
namespace relpipe {
namespace writer {
class RelationalWriter {
public:
virtual ~RelationalWriter() = default;
/**
* @param typeCode string type code as defined in Specification
* @return numeric id of given type
* @throws RelpipeWriterException on unsupported typeCode
*/
virtual TypeId toTypeId(const string_t typeCode) = 0;
/**
* @param typeId numeric type id as defined in Specification
* @return string code of given type
* @throws RelpipeWriterException on unsupported typeId
*/
virtual string_t toTypeCode(const TypeId typeId) = 0;
/**
* @param name name of the relation (table)
* @param attributes list of attributes (columns) containing their names and types
* @param writeHeader header might be omitted – when appending new records to a stream alreaready containing the header
*/
virtual void startRelation(string_t name, std::vector<std::pair<string_t, TypeId>> attributes, boolean_t writeHeader) = 0;
/**
* Writes a single attribute.
* @param value string representation of value of given attribute type as defined in Specification
*/
virtual void writeAttribute(const string_t& value) = 0;
// TODO: fluent interface?
// TODO: << operator?
// TODO: write bitmap + attribute:
// virtual void writeBitmap(...) = 0;
// virtual void writeAttribute(string_t attribute) = 0;
/**
* Writes a single attribute.
* @param value raw pointer to the value in format of given attribute type as defined in Specification
* @param type used as a safety mechanism to avoid wrong pointer interpretation;
* should be called in this way: writeAttribute(&value, typeid(value));
* if the type does not match, the RelpipeWriterException is thrown
*/
virtual void writeAttribute(const void* value, const std::type_info& type) = 0;
};
}
}