~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, Inc.

 *

 *  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

 */

#pragma once

#include <drizzled/function/func.h>

namespace drizzled

{

class Item_func_numhybrid: public Item_func

{

protected:

  Item_result hybrid_type;

public:

  Item_func_numhybrid(): Item_func(), hybrid_type(REAL_RESULT)

  {}

  Item_func_numhybrid(Item *a) :Item_func(a), hybrid_type(REAL_RESULT)

  {}

  Item_func_numhybrid(Item *a,Item *b)

    :Item_func(a,b), hybrid_type(REAL_RESULT)

  {}

  Item_func_numhybrid(List<Item> &list)

    :Item_func(list), hybrid_type(REAL_RESULT)

  {}

  enum Item_result result_type () const { return hybrid_type; }

  void fix_length_and_dec();

  void fix_num_length_and_dec();

  virtual void find_num_type()= 0; /* To be called from fix_length_and_dec */

  double val_real();

  int64_t val_int();

  type::Decimal *val_decimal(type::Decimal *);

  String *val_str(String*str);

  /**

     @brief Performs the operation that this functions implements when the

     result type is INT.

     @return The result of the operation.

  */

  virtual int64_t int_op()= 0;

  /**

     @brief Performs the operation that this functions implements when the

     result type is REAL.

     @return The result of the operation.

  */

  virtual double real_op()= 0;

  /**

     @brief Performs the operation that this functions implements when the

     result type is DECIMAL.

     @param A pointer where the DECIMAL value will be allocated.

     @return

       - 0 If the result is NULL

       - The same pointer it was given, with the area initialized to the

         result of the operation.

  */

  virtual type::Decimal *decimal_op(type::Decimal *)= 0;

  /**

     @brief Performs the operation that this functions implements when the

     result type is a string type.

     @return The result of the operation.

  */

  virtual String *str_op(String *)= 0;

  bool is_null() { update_null_value(); return null_value; }

};

} /* namespace drizzled */