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  • Committer: monty
  • Date: 2009-02-04 23:07:22 UTC
  • mfrom: (779.3.54 devel)
  • mto: (779.7.3 devel)
  • mto: This revision was merged to the branch mainline in revision 840.
  • Revision ID: monty@piggy.tangent.org-20090204230722-6lzqeyysgfhare65
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drizzled/function/time/week.cc
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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 *
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 *  Copyright (C) 2008 Sun Microsystems
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; version 2 of the License.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#include <drizzled/server_includes.h>
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#include CSTDINT_H
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#include <drizzled/function/time/week.h>
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#include <drizzled/function/time/week_mode.h>
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/**
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 @verbatim
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  The bits in week_format(for calc_week() function) has the following meaning:
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   WEEK_MONDAY_FIRST (0)  If not set    Sunday is first day of week
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                          If set        Monday is first day of week
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   WEEK_YEAR (1)          If not set    Week is in range 0-53
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        Week 0 is returned for the the last week of the previous year (for
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        a date at start of january) In this case one can get 53 for the
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        first week of next year.  This flag ensures that the week is
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        relevant for the given year. Note that this flag is only
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        releveant if WEEK_JANUARY is not set.
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                          If set         Week is in range 1-53.
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        In this case one may get week 53 for a date in January (when
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        the week is that last week of previous year) and week 1 for a
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        date in December.
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  WEEK_FIRST_WEEKDAY (2)  If not set    Weeks are numbered according
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                                        to ISO 8601:1988
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                          If set        The week that contains the first
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                                        'first-day-of-week' is week 1.
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        ISO 8601:1988 means that if the week containing January 1 has
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        four or more days in the new year, then it is week 1;
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        Otherwise it is the last week of the previous year, and the
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        next week is week 1.
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 @endverbatim
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*/
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int64_t Item_func_week::val_int()
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{
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  assert(fixed == 1);
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  uint32_t year;
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  DRIZZLE_TIME ltime;
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  if (get_arg0_date(&ltime, TIME_NO_ZERO_DATE))
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    return 0;
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  return (int64_t) calc_week(&ltime,
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                              week_mode((uint) args[1]->val_int()),
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                              &year);
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}
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