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#pragma once
#include <string>
#include <vector>
/**
* @file Types.h
* @brief Shared enum types and core data types used by the runtime.
*/
/** @brief Runtime object categories known by the object manager. */
enum OBJECT_TYPE {
/** A database snapshot grouping relations and tuples. */
MULTIGROUP,
/** A relation object. */
RELATION,
/** An attribute object (schema metadata). */
ATTRIBUTE,
/** A transaction object. */
TRANSACTION
};
/** @brief Operations that may be supported by an object type. */
enum METHOD {
/** Opens an object and creates an authorized handle. */
OPEN,
/** Closes a previously opened handle. */
CLOSE,
/** Parses through a secondary namespace. */
PARSE,
/** Performs security checks. */
SECURITY
};
/** @brief Claims granted to an authenticated connection. */
enum AUTH_CLAIM {
/** Permission to read object state. */
READ,
/** Permission to mutate object state. */
WRITE
};
/** @brief Authentication strategies supported by the permissions layer. */
enum AUTH_METHOD {
/** Certificate-based authentication. */
CERTIFICATE,
/** Plain-text authentication. */
PLAIN_TEXT
};
namespace nt
{
/** @brief A single named value in a tuple, produced by the cursor layer. */
struct Attribute {
std::string name;
std::string value;
};
/**
* @brief A single row of data streamed lazily from the cursor layer.
*
* Follows the Volcano pull model: callers repeatedly call Next() to consume
* one attribute at a time. Returns nullptr when all attributes are exhausted.
*/
class Tuple {
public:
explicit Tuple(std::vector<Attribute> attributes)
: attributes_(std::move(attributes)) {}
/** @brief Returns the next attribute, or nullptr when exhausted. */
const Attribute* Next() {
if (position_ < attributes_.size())
return &attributes_[position_++];
return nullptr;
}
void Reset() { position_ = 0; }
private:
std::vector<Attribute> attributes_;
size_t position_ = 0;
};
}
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