~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems, Inc.

 *

 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifndef DRIZZLED_ITEM_FIELD_H

#define DRIZZLED_ITEM_FIELD_H

namespace drizzled

{

extern Item **not_found_item;

class COND_EQUAL;

class Item_field :public Item_ident

{

protected:

  void set_field(Field *field);

public:

  Field *field,*result_field;

  Item_equal *item_equal;

  bool no_const_subst;

  /*

    if any_privileges set to true then here real effective privileges will

    be stored

  */

  uint32_t have_privileges;

  /* field need any privileges (for VIEW creation) */

  bool any_privileges;

  Item_field(Name_resolution_context *context_arg,

             const char *db_arg,const char *table_name_arg,

	     const char *field_name_arg);

  /*

    Constructor needed to process subselect with temporary tables (see Item)

  */

  Item_field(Session *session, Item_field *item);

  /*

    Constructor used inside setup_wild(), ensures that field, table,

    and database names will live as long as Item_field (this is important

    in prepared statements).

  */

  Item_field(Session *session, Name_resolution_context *context_arg, Field *field);

  /*

    If this constructor is used, fix_fields() won't work, because

    db_name, table_name and column_name are unknown. It's necessary to call

    reset_field() before fix_fields() for all fields created this way.

  */

  Item_field(Field *field);

  enum Type type() const { return FIELD_ITEM; }

  bool eq(const Item *item, bool binary_cmp) const;

  double val_real();

  int64_t val_int();

  type::Decimal *val_decimal(type::Decimal *);

  String *val_str(String*);

  double val_result();

  int64_t val_int_result();

  String *str_result(String* tmp);

  type::Decimal *val_decimal_result(type::Decimal *);

  bool val_bool_result();

  bool send(plugin::Client *client, String *str_arg);

  void reset_field(Field *f);

  bool fix_fields(Session *, Item **);

  void fix_after_pullout(Select_Lex *new_parent, Item **ref);

  void make_field(SendField *tmp_field);

  int save_in_field(Field *field,bool no_conversions);

  void save_org_in_field(Field *field);

  table_map used_tables() const;

  enum Item_result result_type () const;

  Item_result cast_to_int_type() const;

  enum_field_types field_type() const;

  int64_t val_int_endpoint(bool left_endp, bool *incl_endp);

  Field *get_tmp_table_field() { return result_field; }

  Field *tmp_table_field(Table *) { return result_field; }

  bool get_date(type::Time *ltime,uint32_t fuzzydate);

  bool get_date_result(type::Time *ltime,uint32_t fuzzydate);

  bool get_time(type::Time *ltime);

  bool is_null();

  void update_null_value();

  Item *get_tmp_table_item(Session *session);

  bool collect_item_field_processor(unsigned char * arg);

  bool find_item_in_field_list_processor(unsigned char *arg);

  bool register_field_in_read_map(unsigned char *arg);

  void cleanup();

  bool result_as_int64_t();

  Item_equal *find_item_equal(COND_EQUAL *cond_equal);

  bool subst_argument_checker(unsigned char **arg);

  Item *equal_fields_propagator(unsigned char *arg);

  bool set_no_const_sub(unsigned char *arg);

  Item *replace_equal_field(unsigned char *arg);

  uint32_t max_disp_length();

  Item *safe_charset_converter(const CHARSET_INFO * const tocs);

  int fix_outer_field(Session *session, Field **field, Item **reference);

  virtual Item *update_value_transformer(unsigned char *select_arg);

  virtual void print(String *str, enum_query_type query_type);

  friend class Item_default_value;

  friend class Item_insert_value;

  friend class Select_Lex_Unit;

};

} /* namespace drizzled */

#endif /* DRIZZLED_ITEM_FIELD_H */