/* Copyright (c) 2015, 2021, 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 BOOTSTRAP_IMPL_H
#define BOOTSTRAP_IMPL_H 1
#include <string>
#include "sql_bootstrap.h"       // MAX_BOOTSTRAP_QUERY_SIZE


/** abstract interface to reading bootstrap commands */
class Command_iterator
{
public:
  /** start processing the iterator */
  virtual void begin(void) {}

  /**
    Get the next query string.

    @param[out] query return the query
    @param[out] read_error return the read error code
    @param[out] query_source return the source of the query
                             (if it is from a file or a compiled one).
    @return one of the READ_BOOTSTRAP
  */
  virtual int next(std::string &query, int *read_error, int *query_source)= 0;

  /** end processing the iterator */
  virtual void end(void) {}

  /** The current bootstrap command reader */
  static Command_iterator *current_iterator;

protected:
  /** needed because of the virtual functions */
  virtual ~Command_iterator() {}
};

/** File bootstrap command reader */
class File_command_iterator : public Command_iterator
{
public:
  File_command_iterator(fgets_input_t input, fgets_fn_t fgets_fn)
    : m_input(input), m_fgets_fn(fgets_fn), is_allocated(false)
  {}
  File_command_iterator(const char *file_name);
  virtual ~File_command_iterator();

  int next(std::string &query, int *read_error, int *query_source);
  void end(void);
  bool has_file()
  {
    return m_input != 0;
  }
protected:
  fgets_input_t m_input;
  fgets_fn_t m_fgets_fn;
  bool is_allocated;
};


#endif /* BOOTSTRAP_IMPL_H */
