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Current File : /www/server/mysql/src/rapid/plugin/x/src/statement_builder.h
/*
 * Copyright (c) 2015, 2023, Oracle and/or its affiliates.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2.0,
 * as published by the Free Software Foundation.
 *
 * This program is also distributed with certain software (including
 * but not limited to OpenSSL) that is licensed under separate terms,
 * as designated in a particular file or component or in included license
 * documentation.  The authors of MySQL hereby grant you an additional
 * permission to link the program and your derivative works with the
 * separately licensed software that they have included with MySQL.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License, version 2.0, for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef STATEMENT_BUILDER_H_
#define STATEMENT_BUILDER_H_

#include "ngs/error_code.h"
#include "ngs/protocol_fwd.h"
#include "expr_generator.h"

#include "ngs_common/protocol_protobuf.h"
#include "ngs_common/bind.h"
#include <algorithm>

namespace xpl
{

class Statement_builder
{
public:
  Statement_builder(const Expression_generator &gen) : m_builder(gen) {}

protected:
  typedef ::Mysqlx::Crud::Collection Collection;

  void add_collection(const Collection &table) const;

  template<typename T>
  void add_alias(const T &item) const
  {
    if (item.has_alias())
      m_builder.put(" AS ").put_identifier(item.alias());
  }

  class Generator
  {
  public:
    explicit Generator(const Expression_generator &gen)
    : m_gen(gen), m_qb(gen.query_string_builder())
    {}

    template<typename T>
    const Generator &put_expr(const T &expr) const
    {
      m_gen.feed(expr);
      return *this;
    }

    template<typename I, typename Op>
    const Generator &put_each(I begin, I end, Op generate) const
    {
      std::for_each(begin, end, generate);
      return *this;
    }

    template<typename I, typename Op>
    const Generator &put_list(I begin, I end, Op generate,
                              const std::string &separator = ",") const
    {
      if (end - begin == 0)
        return *this;

      generate(*begin);
      for (++begin; begin != end; ++begin)
      {
        m_qb.put(separator);
        generate(*begin);
      }
      return *this;
    }

    template<typename L, typename Op>
    const Generator &put_list(const L &list, Op generate,
                              const std::string &separator = ",") const
    {
      return put_list(list.begin(), list.end(), generate, separator);
    }

    template<typename T>
    const Generator &put_list(const ::google::protobuf::RepeatedPtrField<T> &list,
                              const Generator &(Generator::*put_fun)(const T &) const,
                              const std::string &separator = ",") const
    {
      return put_list(list.begin(), list.end(),
                      ngs::bind(put_fun, this, ngs::placeholders::_1),
                      separator);
    }

    template<typename T>
    const Generator &put(const T &str) const
    {
      m_qb.put(str);
      return *this;
    }

    const Generator &put(const Query_string_builder &str) const
    {
      m_qb.put(str.get());
      return *this;
    }

    const Generator &put_identifier(const std::string &str) const
    {
      m_qb.quote_identifier(str);
      return *this;
    }

    const Generator &put_quote(const std::string &str) const
    {
      m_qb.quote_string(str);
      return *this;
    }

    const Generator &dot() const
    {
      m_qb.dot();
      return *this;
    }

    const Expression_generator &m_gen;
    Query_string_builder &m_qb;
  } m_builder;
};


class Crud_statement_builder : public Statement_builder
{
public:
  Crud_statement_builder(const Expression_generator &gen) : Statement_builder(gen) {}

protected:
  typedef ::Mysqlx::Expr::Expr Filter;
  typedef ::Mysqlx::Crud::Limit Limit;
  typedef ::Mysqlx::Crud::Order Order_item;
  typedef ::google::protobuf::RepeatedPtrField<Order_item> Order_list;

  void add_filter(const Filter &filter) const;
  void add_order(const Order_list &order) const;
  void add_limit(const Limit &limit, const bool no_offset) const;
  void add_order_item(const Order_item &item) const;
};

template<typename T>
inline bool is_table_data_model(const T &msg)
{
  return msg.data_model() == ::Mysqlx::Crud::TABLE;
}

} // namespace xpl

#endif // STATEMENT_BUILDER_H_

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