~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

 *

 *  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_FUNCTION_TIME_NOW_H

#define DRIZZLED_FUNCTION_TIME_NOW_H

#include <drizzled/function/time/date.h>

#include "drizzled/temporal.h"

namespace drizzled

{

/* Abstract CURRENT_TIMESTAMP function. See also Item_func_curtime */

class Item_func_now :public Item_date_func

{

protected:

  int64_t value;

  char buff[20*2+32];   // +32 to make my_snprintf_{8bit|ucs2} happy

  uint32_t buff_length;

  DRIZZLE_TIME ltime;

  DateTime cached_temporal;

public:

  Item_func_now() :Item_date_func() {}

  Item_func_now(Item *a) :Item_date_func(a) {}

  enum Item_result result_type () const { return STRING_RESULT; }

  int64_t val_int() { assert(fixed == 1); return value; }

  int save_in_field(Field *to, bool no_conversions);

  String *val_str(String *str);

  void fix_length_and_dec();

  /**

   * For NOW() and sisters, there is no argument, and we 

   * return a cached Date value that we create during fix_length_and_dec.

   *

   * Always returns true, since a DateTime can always be constructed

   * from a time_t

   *

   * @param Reference to a DateTime to populate

   */

  bool get_temporal(DateTime &temporal);

  bool get_date(DRIZZLE_TIME *res, uint32_t fuzzy_date);

  virtual void store_now_in_TIME(DRIZZLE_TIME *now_time)=0;

};

class Item_func_now_local :public Item_func_now

{

public:

  Item_func_now_local() :Item_func_now() {}

  Item_func_now_local(Item *a) :Item_func_now(a) {}

  const char *func_name() const { return "now"; }

  virtual void store_now_in_TIME(DRIZZLE_TIME *now_time);

  virtual enum Functype functype() const { return NOW_FUNC; }

};

class Item_func_now_utc :public Item_func_now

{

public:

  Item_func_now_utc() :Item_func_now() {}

  Item_func_now_utc(Item *a) :Item_func_now(a) {}

  const char *func_name() const { return "utc_timestamp"; }

  virtual void store_now_in_TIME(DRIZZLE_TIME *now_time);

};

} /* namespace drizzled */

#endif /* DRIZZLED_FUNCTION_TIME_NOW_H */