~drizzle-trunk/drizzle/development

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

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

 *

 *  Copyright (C) 2008 MySQL

 *

 *  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; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  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

 */

#include "config.h"

#include <boost/lexical_cast.hpp>

#include "drizzled/field/datetime.h"

#include "drizzled/error.h"

#include "drizzled/table.h"

#include "drizzled/temporal.h"

#include "drizzled/session.h"

#include <math.h>

#include <sstream>

#include <string>

namespace drizzled

{

/****************************************************************************

** datetime type

** In string context: YYYY-MM-DD HH:MM:DD

** In number context: YYYYMMDDHHMMDD

** Stored as a 8 byte unsigned int. Should sometimes be change to a 6 byte int.

****************************************************************************/

int Field_datetime::store(const char *from,

                          uint32_t len,

                          const CHARSET_INFO * const )

{

  ASSERT_COLUMN_MARKED_FOR_WRITE;

  /* 

   * Try to create a DateTime from the supplied string.  Throw an error

   * if unable to create a valid DateTime.  

   */

  DateTime temporal;

  if (! temporal.from_string(from, (size_t) len))

  {

    my_error(ER_INVALID_DATETIME_VALUE, MYF(ME_FATALERROR), from);

    return 2;

  }

  /* Create the stored integer format. @TODO This should go away. Should be up to engine... */

  int64_t int_value;

  temporal.to_int64_t(&int_value);

#ifdef WORDS_BIGENDIAN

  if (getTable() && getTable()->s->db_low_byte_first)

  {

    int8store(ptr, int_value);

  }

  else

#endif

    int64_tstore(ptr, int_value);

  return 0;

}

int Field_datetime::store(double from)

{

  ASSERT_COLUMN_MARKED_FOR_WRITE;

  if (from < 0.0 || from > 99991231235959.0)

  {

    /* Convert the double to a string using stringstream */

    //std::stringstream ss;

    //std::string tmp;

    //ss.precision(18); /* 18 places should be fine for error display of double input. */

    //ss << from; ss >> tmp;

    std::string tmp(boost::lexical_cast<std::string>(from));

    my_error(ER_INVALID_DATETIME_VALUE, MYF(ME_FATALERROR), tmp.c_str());

    return 2;

  }

  return Field_datetime::store((int64_t) rint(from), false);

}

int Field_datetime::store(int64_t from, bool)

{

  ASSERT_COLUMN_MARKED_FOR_WRITE;

  /* 

   * Try to create a DateTime from the supplied integer.  Throw an error

   * if unable to create a valid DateTime.  

   */

  DateTime temporal;

  if (! temporal.from_int64_t(from))

  {

    /* Convert the integer to a string using stringstream */

    //std::stringstream ss;

    //std::string tmp;

    //ss << from; ss >> tmp;

    std::string tmp(boost::lexical_cast<std::string>(from));

    my_error(ER_INVALID_DATETIME_VALUE, MYF(ME_FATALERROR), tmp.c_str());

    return 2;

  }

  /* 

   * Because "from" may be a silly MySQL-like "datetime number" (like, oh, 101)

   * we must here get the value of the DateTime as its *real* int64_t, after

   * the conversion above has been done...yuck. God, save us.

   */

  int64_t int_value;

  temporal.to_int64_t(&int_value);

#ifdef WORDS_BIGENDIAN

  if (getTable() && getTable()->s->db_low_byte_first)

  {

    int8store(ptr, int_value);

  }

  else

#endif

    int64_tstore(ptr, int_value);

  return 0;

}

int Field_datetime::store_time(DRIZZLE_TIME *ltime, enum enum_drizzle_timestamp_type)

{

  DateTime temporal;

  temporal.set_years(ltime->year);

  temporal.set_months(ltime->month);

  temporal.set_days(ltime->day);

  temporal.set_hours(ltime->hour);

  temporal.set_minutes(ltime->minute);

  temporal.set_seconds(ltime->second);

  if (! temporal.is_valid())

  {

    char tmp_string[MAX_DATE_STRING_REP_LENGTH];

    size_t tmp_string_len;

    tmp_string_len= temporal.to_string(tmp_string, MAX_DATE_STRING_REP_LENGTH);

    assert(tmp_string_len < MAX_DATE_STRING_REP_LENGTH);

    my_error(ER_INVALID_DATETIME_VALUE, MYF(ME_FATALERROR), tmp_string);

    return 1;

  }

  int64_t int_value;

  temporal.to_int64_t(&int_value);

#ifdef WORDS_BIGENDIAN

  if (getTable() && getTable()->s->db_low_byte_first)

  {

    int8store(ptr, int_value);

  }

  else

#endif

    int64_tstore(ptr, int_value);

  return 0;

}

double Field_datetime::val_real(void)

{

  return (double) Field_datetime::val_int();

}

int64_t Field_datetime::val_int(void)

{

  int64_t j;

  ASSERT_COLUMN_MARKED_FOR_READ;

#ifdef WORDS_BIGENDIAN

  if (getTable() && getTable()->s->db_low_byte_first)

    j=sint8korr(ptr);

  else

#endif

    int64_tget(j,ptr);

  return j;

}

String *Field_datetime::val_str(String *val_buffer,

				String *)

{

  val_buffer->alloc(DateTime::MAX_STRING_LENGTH);

  val_buffer->length(DateTime::MAX_STRING_LENGTH);

  int64_t tmp;

  ASSERT_COLUMN_MARKED_FOR_READ;

#ifdef WORDS_BIGENDIAN

  if (getTable() && getTable()->s->db_low_byte_first)

    tmp=sint8korr(ptr);

  else

#endif

    int64_tget(tmp,ptr);

  DateTime dt;

  /* TODO: add an assert that this succeeds

   * currently fails due to bug in allowing

   * ALTER TABLE to add a datetime column that's

   * not null without a default value.

   */

  dt.from_int64_t(tmp, false); /* NOTE: this does *NOT* attempt convertion

				        from formats such as 20090101 as

					the stored value has already been

					converted.

			       */

  int rlen;

  rlen= dt.to_string((char*)val_buffer->ptr(), DateTime::MAX_STRING_LENGTH);

  assert((rlen+1) <  DateTime::MAX_STRING_LENGTH);

  val_buffer->length(rlen);

  return val_buffer;

}

bool Field_datetime::get_date(DRIZZLE_TIME *ltime, uint32_t fuzzydate)

{

  int64_t tmp=Field_datetime::val_int();

  uint32_t part1,part2;

  part1=(uint32_t) (tmp/INT64_C(1000000));

  part2=(uint32_t) (tmp - (uint64_t) part1*INT64_C(1000000));

  ltime->time_type=	DRIZZLE_TIMESTAMP_DATETIME;

  ltime->neg=		0;

  ltime->second_part=	0;

  ltime->second=	(int) (part2%100);

  ltime->minute=	(int) (part2/100%100);

  ltime->hour=		(int) (part2/10000);

  ltime->day=		(int) (part1%100);

  ltime->month= 	(int) (part1/100%100);

  ltime->year= 		(int) (part1/10000);

  return (!(fuzzydate & TIME_FUZZY_DATE) && (!ltime->month || !ltime->day)) ? 1 : 0;

}

bool Field_datetime::get_time(DRIZZLE_TIME *ltime)

{

  return Field_datetime::get_date(ltime,0);

}

int Field_datetime::cmp(const unsigned char *a_ptr, const unsigned char *b_ptr)

{

  int64_t a,b;

#ifdef WORDS_BIGENDIAN

  if (getTable() && getTable()->s->db_low_byte_first)

  {

    a=sint8korr(a_ptr);

    b=sint8korr(b_ptr);

  }

  else

#endif

  {

    int64_tget(a,a_ptr);

    int64_tget(b,b_ptr);

  }

  return ((uint64_t) a < (uint64_t) b) ? -1 :

    ((uint64_t) a > (uint64_t) b) ? 1 : 0;

}

void Field_datetime::sort_string(unsigned char *to,uint32_t )

{

#ifdef WORDS_BIGENDIAN

  if (!getTable() || !getTable()->s->db_low_byte_first)

  {

    to[0] = ptr[0];

    to[1] = ptr[1];

    to[2] = ptr[2];

    to[3] = ptr[3];

    to[4] = ptr[4];

    to[5] = ptr[5];

    to[6] = ptr[6];

    to[7] = ptr[7];

  }

  else

#endif

  {

    to[0] = ptr[7];

    to[1] = ptr[6];

    to[2] = ptr[5];

    to[3] = ptr[4];

    to[4] = ptr[3];

    to[5] = ptr[2];

    to[6] = ptr[1];

    to[7] = ptr[0];

  }

}

void Field_datetime::sql_type(String &res) const

{

  res.set_ascii(STRING_WITH_LEN("datetime"));

}

} /* namespace drizzled */