~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

 */

#ifndef DRIZZLED_ITEM_COPY_STRING_H

#define DRIZZLED_ITEM_COPY_STRING_H

#include <drizzled/item/ident.h>

#include <drizzled/item/field.h>

class Item_copy_string :public Item

{

  enum enum_field_types cached_field_type;

public:

  Item *item;

  Item_copy_string(Item *i) :item(i)

  {

    null_value= maybe_null= item->maybe_null;

    decimals=item->decimals;

    max_length=item->max_length;

    name=item->name;

    cached_field_type= item->field_type();

  }

  enum Type type() const { return COPY_STR_ITEM; }

  enum Item_result result_type () const { return STRING_RESULT; }

  enum_field_types field_type() const { return cached_field_type; }

  double val_real()

  {

    int err_not_used;

    char *end_not_used;

    return (null_value ? 0.0 :

            my_strntod(str_value.charset(), (char*) str_value.ptr(),

                       str_value.length(), &end_not_used, &err_not_used));

  }

  int64_t val_int()

  {

    int err;

    return null_value ? 0 : my_strntoll(str_value.charset(),str_value.ptr(),

                                        str_value.length(),10, (char**) 0,

                                        &err);

  }

  String *val_str(String*);

  my_decimal *val_decimal(my_decimal *);

  void make_field(Send_field *field) { item->make_field(field); }

  void copy();

  int save_in_field(Field *field, bool)

  {

    return save_str_value_in_field(field, &str_value);

  }

  table_map used_tables() const { return (table_map) 1L; }

  bool const_item() const { return 0; }

  bool is_null() { return null_value; }

};

class Item_default_value : public Item_field

{

public:

  Item *arg;

  Item_default_value(Name_resolution_context *context_arg)

    :Item_field(context_arg, (const char *)NULL, (const char *)NULL,

               (const char *)NULL),

     arg(NULL) {}

  Item_default_value(Name_resolution_context *context_arg, Item *a)

    :Item_field(context_arg, (const char *)NULL, (const char *)NULL,

                (const char *)NULL),

     arg(a) {}

  enum Type type() const { return DEFAULT_VALUE_ITEM; }

  bool eq(const Item *item, bool binary_cmp) const;

  bool fix_fields(Session *, Item **);

  virtual void print(String *str, enum_query_type query_type);

  int save_in_field(Field *field_arg, bool no_conversions);

  table_map used_tables() const { return (table_map)0L; }

  bool walk(Item_processor processor, bool walk_subquery, unsigned char *args)

  {

    return arg->walk(processor, walk_subquery, args) ||

      (this->*processor)(args);

  }

  Item *transform(Item_transformer transformer, unsigned char *args);

};

#endif /* DRIZZLED_ITEM_COPY_STRING_H */