~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

 */

#include <drizzled/server_includes.h>

#include <drizzled/function/math/int.h>

#include <drizzled/plugin/function.h>

using namespace std;

using namespace drizzled;

class CharLengthFunction :public Item_int_func

{

  String value;

public:

  int64_t val_int();

  CharLengthFunction() :Item_int_func() {}

  const char *func_name() const 

  { 

    return "char_length"; 

  }

  void fix_length_and_dec() 

  { 

    max_length= 10;

  }

  bool check_argument_count(int n)

  {

    return (n == 1);

  }

};

int64_t CharLengthFunction::val_int()

{

  assert(fixed == true);

  String *res=args[0]->val_str(&value);

  if (res == NULL)

  {

    null_value= true;

    return 0;

  }

  null_value= false;

  return (int64_t) res->numchars();

}

plugin::Create_function<CharLengthFunction> *charlengthudf= NULL;

static int initialize(drizzled::plugin::Registry &registry)

{

  charlengthudf= new plugin::Create_function<CharLengthFunction>("char_length");

  charlengthudf->addAlias("character_length");

  registry.function.add(charlengthudf);

  return 0;

}

static int finalize(drizzled::plugin::Registry &registry)

{

   registry.function.remove(charlengthudf);

   delete charlengthudf;

   return 0;

}

drizzle_declare_plugin(charlength)

{

  "charlength",

  "1.0",

  "Devananda van der Veen",

  "Return the number of characters in a string",

  PLUGIN_LICENSE_GPL,

  initialize, /* Plugin Init */

  finalize,   /* Plugin Deinit */

  NULL,   /* status variables */

  NULL,   /* system variables */

  NULL    /* config options */

}

drizzle_declare_plugin_end;