~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2006 MySQL AB

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; version 2 of the License.

   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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/* class for the the heap handler */

#include <heap.h>

class ha_heap: public handler

{

  HP_INFO *file;

  HP_SHARE *internal_share;

  key_map btree_keys;

  /* number of records changed since last statistics update */

  uint32_t    records_changed;

  uint32_t    key_stat_version;

  bool internal_table;

public:

  ha_heap(handlerton *hton, TABLE_SHARE *table);

  ~ha_heap() {}

  handler *clone(MEM_ROOT *mem_root);

  const char *table_type() const

  {

    return "MEMORY";

  }

  const char *index_type(uint32_t inx)

  {

    return ((table_share->key_info[inx].algorithm == HA_KEY_ALG_BTREE) ?

            "BTREE" : "HASH");

  }

  enum row_type get_row_type() const;

  const char **bas_ext() const;

  uint64_t 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);

  }

  uint32_t index_flags(uint32_t inx, uint32_t part __attribute__((unused)),

                       bool all_parts __attribute__((unused))) 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; }

  uint32_t max_supported_keys()          const { return MAX_KEY; }

  uint32_t max_supported_key_part_length() const { return MAX_KEY_LENGTH; }

  double scan_time()

  { return (double) (stats.records+stats.deleted) / 20.0+10; }

  double read_time(uint32_t index __attribute__((unused)),

                   uint32_t ranges __attribute__((unused)),

                   ha_rows rows)

  { return (double) rows /  20.0+1; }

  int open(const char *name, int mode, uint32_t test_if_locked);

  int close(void);

  void set_keys_for_scanning(void);

  int write_row(unsigned char * buf);

  int update_row(const unsigned char * old_data, unsigned char * new_data);

  int delete_row(const unsigned char * buf);

  virtual void get_auto_increment(uint64_t offset, uint64_t increment,

                                  uint64_t nb_desired_values,

                                  uint64_t *first_value,

                                  uint64_t *nb_reserved_values);

  int index_read_map(unsigned char * buf, const unsigned char * key, key_part_map keypart_map,

                     enum ha_rkey_function find_flag);

  int index_read_last_map(unsigned char *buf, const unsigned char *key, key_part_map keypart_map);

  int index_read_idx_map(unsigned char * buf, uint32_t index, const unsigned char * key,

                         key_part_map keypart_map,

                         enum ha_rkey_function find_flag);

  int index_next(unsigned char * buf);

  int index_prev(unsigned char * buf);

  int index_first(unsigned char * buf);

  int index_last(unsigned char * buf);

  int rnd_init(bool scan);

  int rnd_next(unsigned char *buf);

  int rnd_pos(unsigned char * buf, unsigned char *pos);

  void position(const unsigned char *record);

  int info(uint);

  int extra(enum ha_extra_function operation);

  int reset();

  int external_lock(Session *session, int lock_type);

  int delete_all_rows(void);

  int disable_indexes(uint32_t mode);

  int enable_indexes(uint32_t mode);

  int indexes_are_disabled(void);

  ha_rows records_in_range(uint32_t 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(Session *session, THR_LOCK_DATA **to,

			     enum thr_lock_type lock_type);

  int cmp_ref(const unsigned char *ref1, const unsigned char *ref2)

  {

    return memcmp(ref1, ref2, sizeof(HEAP_PTR));

  }

  bool check_if_incompatible_data(HA_CREATE_INFO *info, uint32_t table_changes);

private:

  void update_key_stats();

};