query/include/matador/sql/query_parts.hpp

#ifndef QUERY_QUERY_PARTS_HPP
#define QUERY_QUERY_PARTS_HPP

#include "matador/sql/basic_condition.hpp"
#include "matador/sql/query_part_visitor.hpp"
#include "matador/sql/column.hpp"
#include "matador/sql/column_definition.hpp"
#include "matador/sql/dialect.hpp"
#include "matador/sql/table.hpp"

#include <memory>

namespace matador::sql {

class basic_condition;

class query_part
{
protected:
  explicit query_part(sql::dialect::token_t token);

public:
  virtual ~query_part() = default;
  virtual void accept(query_part_visitor &visitor) = 0;

protected:
  sql::dialect::token_t token_;
};

/**
 * Represents the SQL SELECT part
 */
class query_select_part : public query_part
{
public:
  explicit query_select_part(std::vector<column> columns);
  void accept(query_part_visitor &visitor) override;

  [[nodiscard]] const std::vector<column>& columns() const;

private:
  std::vector<column> columns_;
};

/**
 * Represents the SQL FROM part
 */
class query_from_part : public query_part
{
public:
  explicit query_from_part(sql::table t);

  [[nodiscard]] const sql::table& table() const;

private:
  void accept(query_part_visitor &visitor) override;

private:
  sql::table table_;
};

class query_join_part : public query_part
{
public:
  explicit query_join_part(sql::table t);

  [[nodiscard]] const sql::table& table() const;

private:
  void accept(query_part_visitor &visitor) override;

private:
  sql::table table_;
};

class query_on_part : public query_part
{
public:
  template < class Condition >
  explicit query_on_part(const Condition &cond)
    : query_part(dialect::token_t::ON)
    , condition_(new Condition(cond)) {}

  const basic_condition& condition() const;

private:
  void accept(query_part_visitor &visitor) override;

private:
  std::unique_ptr<basic_condition> condition_;
};

class query_where_part : public query_part
{
public:
  template < class Condition >
  explicit query_where_part(const Condition &cond)
  : query_part(dialect::token_t::WHERE)
  , condition_(new Condition(cond)) {}

  const basic_condition& condition() const;

private:
  void accept(query_part_visitor &visitor) override;

private:
  std::unique_ptr<basic_condition> condition_;
};

class query_table_name_part : public query_part
{
protected:
  explicit query_table_name_part(sql::dialect::token_t token, std::string table_name);

protected:
  std::string table_name_;
};

class query_group_by_part : public query_table_name_part
{
public:
  explicit query_group_by_part(const std::string &table_name);

private:
  void accept(query_part_visitor &visitor) override;
};

class query_order_by_part : public query_part
{
public:
  explicit query_order_by_part(sql::column  col);

  const sql::column& column() const;

private:
  void accept(query_part_visitor &visitor) override;

private:
  sql::column column_;
};

class query_order_by_asc_part : public query_part
{
public:
  query_order_by_asc_part();

private:
  void accept(query_part_visitor &visitor) override;
};

class query_order_by_desc_part : public query_part
{
public:
  query_order_by_desc_part();

private:
  void accept(query_part_visitor &visitor) override;
};

class query_insert_part : public query_part
{
public:
  query_insert_part();

private:
  void accept(query_part_visitor &visitor) override;
};

/**
 * Represents the SQL VALUES part
 */
class query_values_part : public query_part
{
public:
  query_values_part(std::initializer_list<any_type> values);

private:
  void accept(query_part_visitor &visitor) override;

private:
  std::vector<any_type> values_;
};

class query_update_part : public query_table_name_part
{
public:
  explicit query_update_part(const std::string &table_name);

private:
  void accept(query_part_visitor &visitor) override;
};

class query_delete_part : public query_part
{
public:
  query_delete_part();

private:
  void accept(query_part_visitor &visitor) override;
};

class query_create_part : public query_part
{
public:
  query_create_part();

private:
  void accept(query_part_visitor &visitor) override;
};

class query_drop_part : public query_part
{
public:
  query_drop_part();

private:
  void accept(query_part_visitor &visitor) override;
};

}
#endif //QUERY_QUERY_PARTS_HPP