~drizzle-trunk/drizzle/development : contents of plugin/crc32/crc32udf.cc at revision 1671.2.1

~drizzle-trunk/drizzle/development : (revision 1671.2.1)

/* -*- 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 "config.h"
#include <drizzled/plugin/function.h>
#include <drizzled/item/func.h>
#include <drizzled/algorithm/crc32.h>

#include <string>

using namespace std;
using namespace drizzled;

class Crc32Function :public Item_int_func
{
public:
  int64_t val_int();
  
  Crc32Function() :Item_int_func() 
  { 
    unsigned_flag= true; 
  }
  
  const char *func_name() const 
  { 
    return "crc32"; 
  }
  
  void fix_length_and_dec() 
  { 
    max_length= 10; 
  }
  
  bool check_argument_count(int n) 
  { 
    return (n == 1); 
  }
};

int64_t Crc32Function::val_int()
{
  assert(fixed == true);
  String value;
  String *res=args[0]->val_str(&value);
  
  if (res == NULL)
  {
    null_value= true;
    return 0;
  }

  null_value= false;
  return static_cast<int64_t>(drizzled::algorithm::crc32(res->ptr(), res->length()));
}

plugin::Create_function<Crc32Function> *crc32udf= NULL;

static int initialize(module::Context &context)
{
  crc32udf= new plugin::Create_function<Crc32Function>("crc32");
  context.add(crc32udf);
  return 0;
}

DRIZZLE_PLUGIN(initialize, NULL, NULL);

584.1.15 by Monty Taylor The mega-patch from hell. Renamed sql_class to session (since that's what it is) and removed it and field and table from common_includes.	1	/* -- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; --
	2	* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
	3	*
	4	* Copyright (C) 2008 Sun Microsystems
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; version 2 of the License.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
	19
1241.9.36 by Monty Taylor ZOMG. I deleted drizzled/server_includes.h.	20	#include "config.h"
1093.1.62 by Monty Taylor Moved UDFs to slot organization.	21	#include <drizzled/plugin/function.h>
584.4.6 by Monty Taylor Moved stuff into item/	22	#include <drizzled/item/func.h>
1259.6.2 by Joe Daly rename hash_algorithm to algorithm	23	#include <drizzled/algorithm/crc32.h>
139.1.2 by Stewart Smith CRC32() as UDF	24
942.1.12 by Monty Taylor Converted udf_func into a factory.	25	#include <string>
	26
	27	using namespace std;
1093.1.62 by Monty Taylor Moved UDFs to slot organization.	28	using namespace drizzled;
942.1.12 by Monty Taylor Converted udf_func into a factory.	29
1086.2.2 by devananda fixed case: crc32Function -> Crc32Function	30	class Crc32Function :public Item_int_func
139.1.8 by Stewart Smith UDFs are now normal Item_func objects. Simplifies handling them a lot.	31	{
	32	public:
	33	int64_t val_int();
1086.2.1 by devananda cleaned up formatting in crc32udf.cc	34
1086.2.2 by devananda fixed case: crc32Function -> Crc32Function	35	Crc32Function() :Item_int_func()
1086.2.1 by devananda cleaned up formatting in crc32udf.cc	36	{
1086.2.3 by devananda formatting cleanup	37	unsigned_flag= true;
1086.2.1 by devananda cleaned up formatting in crc32udf.cc	38	}
	39
	40	const char *func_name() const
	41	{
	42	return "crc32";
	43	}
	44
	45	void fix_length_and_dec()
	46	{
	47	max_length= 10;
	48	}
	49
	50	bool check_argument_count(int n)
	51	{
	52	return (n == 1);
	53	}
139.1.8 by Stewart Smith UDFs are now normal Item_func objects. Simplifies handling them a lot.	54	};
	55
1086.2.2 by devananda fixed case: crc32Function -> Crc32Function	56	int64_t Crc32Function::val_int()
139.1.8 by Stewart Smith UDFs are now normal Item_func objects. Simplifies handling them a lot.	57	{
1086.2.3 by devananda formatting cleanup	58	assert(fixed == true);
1271.2.1 by Tim Penhey Move the member variable to be local to the function.	59	String value;
139.1.8 by Stewart Smith UDFs are now normal Item_func objects. Simplifies handling them a lot.	60	String *res=args[0]->val_str(&value);
1086.2.1 by devananda cleaned up formatting in crc32udf.cc	61
1086.2.3 by devananda formatting cleanup	62	if (res == NULL)
139.1.8 by Stewart Smith UDFs are now normal Item_func objects. Simplifies handling them a lot.	63	{
1086.2.3 by devananda formatting cleanup	64	null_value= true;
1086.2.3 by devananda formatting cleanup	65	return 0;
139.1.8 by Stewart Smith UDFs are now normal Item_func objects. Simplifies handling them a lot.	66	}
1086.2.3 by devananda formatting cleanup	67
1086.2.3 by devananda formatting cleanup	68	null_value= false;
1411.7.5 by Siddharth Prakash Singh code refactoring - removing the type when calling crc32	69	return static_cast<int64_t>(drizzled::algorithm::crc32(res->ptr(), res->length()));
139.1.8 by Stewart Smith UDFs are now normal Item_func objects. Simplifies handling them a lot.	70	}
	71
1093.1.62 by Monty Taylor Moved UDFs to slot organization.	72	plugin::Create_function<Crc32Function> *crc32udf= NULL;
139.1.2 by Stewart Smith CRC32() as UDF	73
1530.2.6 by Monty Taylor Moved plugin::Context to module::Context.	74	static int initialize(module::Context &context)
139.1.2 by Stewart Smith CRC32() as UDF	75	{
1093.1.62 by Monty Taylor Moved UDFs to slot organization.	76	crc32udf= new plugin::Create_function<Crc32Function>("crc32");
1324.2.2 by Monty Taylor Use the plugin::Context everywhere.	77	context.add(crc32udf);
1086.2.1 by devananda cleaned up formatting in crc32udf.cc	78	return 0;
1086.2.1 by devananda cleaned up formatting in crc32udf.cc	79	}
139.1.2 by Stewart Smith CRC32() as UDF	80
1633.6.2 by Vijay Samuel Reverted changes.	81	DRIZZLE_PLUGIN(initialize, NULL, NULL);