Drizzled Public API Documentation

from_days.cc

00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2008 Sun Microsystems, Inc.
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; version 2 of the License.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018  */
00019 
00020 #include <config.h>
00021 #include <boost/lexical_cast.hpp>
00022 #include <drizzled/function/time/from_days.h>
00023 #include <drizzled/error.h>
00024 #include <drizzled/temporal.h>
00025 
00026 #include <sstream>
00027 #include <string>
00028 
00029 namespace drizzled
00030 {
00031 
00036 bool Item_func_from_days::get_temporal(Date &to)
00037 {
00038   assert(fixed);
00039 
00040   /* 
00041    * We MUST call val_int() before checking null_value because, stupidly, 
00042    * a subselect does not evaluate it's scalar items as null until val_xxx()
00043    * has been called. :(
00044    */
00045   int64_t int_value= args[0]->val_int();
00046 
00047   /* We return NULL from FROM_DAYS() only when supplied a NULL argument */
00048   if (args[0]->null_value)
00049   {
00050     null_value= true;
00051     return false;
00052   }
00053 
00054   /* OK, now try to convert from our integer */
00055   if (! to.from_julian_day_number(int_value))
00056   {
00057     /* Bad input, throw an error */
00058     std::string tmp(boost::lexical_cast<std::string>(int_value));
00059 
00060     my_error(ER_ARGUMENT_OUT_OF_RANGE, MYF(ME_FATALERROR), tmp.c_str(), func_name());
00061     return false;
00062   }
00063   return true;
00064 }
00065 
00066 } /* namespace drizzled */