--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/relpipe/writer/RelationalWriter.h Mon Aug 13 20:30:55 2018 +0200
@@ -0,0 +1,63 @@
+#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;
+
+};
+
+}
+}