/*
   Copyright (c) 2000, 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 */


/* class for the the heap handler */

#include <heap.h>
#include "sql_class.h"                          /* THD */

class ha_heap: public handler
{
  HP_INFO *file;
  HP_SHARE *internal_share;
  key_map btree_keys;
  /* number of records changed since last statistics update */
  uint    records_changed;
  uint    key_stat_version;
  my_bool internal_table;
public:
  ha_heap(handlerton *hton, TABLE_SHARE *table);
  ~ha_heap() {}
  handler *clone(const char *name, MEM_ROOT *mem_root);
  const char *table_type() const
  {
    return (table->in_use->variables.sql_mode & MODE_MYSQL323) ?
           "HEAP" : "MEMORY";
  }
  const char *index_type(uint inx)
  {
    return ((table_share->key_info[inx].algorithm == HA_KEY_ALG_BTREE) ?
            "BTREE" : "HASH");
  }
  /* Rows also use a fixed-size format */
  enum row_type get_row_type() const { return ROW_TYPE_FIXED; }
  const char **bas_ext() const;
  ulonglong table_flags() const
  {
    return (HA_FAST_KEY_READ | HA_NO_BLOBS | HA_NULL_IN_KEY |
            HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE |
            HA_REC_NOT_IN_SEQ | HA_NO_TRANSACTIONS |
            HA_HAS_RECORDS | HA_STATS_RECORDS_IS_EXACT);
  }
  ulong index_flags(uint inx, uint part, bool all_parts) const
  {
    return ((table_share->key_info[inx].algorithm == HA_KEY_ALG_BTREE) ?
            HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER | HA_READ_RANGE :
            HA_ONLY_WHOLE_INDEX | HA_KEY_SCAN_NOT_ROR);
  }
  const key_map *keys_to_use_for_scanning() { return &btree_keys; }
  uint max_supported_keys()          const { return MAX_KEY; }
  uint max_supported_key_part_length(HA_CREATE_INFO
                    *create_info MY_ATTRIBUTE((unused))) const
  { return MAX_KEY_LENGTH; }
  double scan_time()
  { return (double) (stats.records+stats.deleted) / 20.0+10; }
  double read_time(uint index, uint ranges, ha_rows rows)
  { return (double) rows /  20.0+1; }

  int open(const char *name, int mode, uint test_if_locked);
  int close(void);
  void set_keys_for_scanning(void);
  int write_row(uchar * buf);
  int update_row(const uchar * old_data, uchar * new_data);
  int delete_row(const uchar * buf);
  virtual void get_auto_increment(ulonglong offset, ulonglong increment,
                                  ulonglong nb_desired_values,
                                  ulonglong *first_value,
                                  ulonglong *nb_reserved_values);
  int index_read_map(uchar * buf, const uchar * key, key_part_map keypart_map,
                     enum ha_rkey_function find_flag);
  int index_read_last_map(uchar *buf, const uchar *key, key_part_map keypart_map);
  int index_read_idx_map(uchar * buf, uint index, const uchar * key,
                         key_part_map keypart_map,
                         enum ha_rkey_function find_flag);
  int index_next(uchar * buf);
  int index_prev(uchar * buf);
  int index_first(uchar * buf);
  int index_last(uchar * buf);
  int rnd_init(bool scan);
  int rnd_next(uchar *buf);
  int rnd_pos(uchar * buf, uchar *pos);
  void position(const uchar *record);
  int info(uint);
  int extra(enum ha_extra_function operation);
  int reset();
  int external_lock(THD *thd, int lock_type);
  int delete_all_rows(void);
  int truncate();
  int reset_auto_increment(ulonglong value);
  int disable_indexes(uint mode);
  int enable_indexes(uint mode);
  int indexes_are_disabled(void);
  ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
  int delete_table(const char *from);
  void drop_table(const char *name);
  int rename_table(const char * from, const char * to);
  int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
  void update_create_info(HA_CREATE_INFO *create_info);

  THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
			     enum thr_lock_type lock_type);
  int cmp_ref(const uchar *ref1, const uchar *ref2)
  {
    return memcmp(ref1, ref2, sizeof(HEAP_PTR));
  }
  bool check_if_incompatible_data(HA_CREATE_INFO *info, uint table_changes);
private:
  void update_key_stats();
};
