~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

 */

#include <config.h>

#include <drizzled/show.h>

#include <drizzled/table.h>

#include <drizzled/item/ident.h>

#include <cstdio>

using namespace std;

namespace drizzled

{

const uint32_t NO_CACHED_FIELD_INDEX= UINT32_MAX;

Item_ident::Item_ident(Name_resolution_context *context_arg,

                       const char *db_name_arg,const char *table_name_arg,

                       const char *field_name_arg)

  :orig_db_name(db_name_arg), orig_table_name(table_name_arg),

   orig_field_name(field_name_arg), context(context_arg),

   db_name(db_name_arg), table_name(table_name_arg),

   field_name(field_name_arg),

   alias_name_used(false), cached_field_index(NO_CACHED_FIELD_INDEX),

   cached_table(0), depended_from(0)

{

  name = (char*) field_name_arg;

}

/**

  Constructor used by Item_field & Item_*_ref (see Item comment)

*/

Item_ident::Item_ident(Session *session, Item_ident *item)

  :Item(session, item),

   orig_db_name(item->orig_db_name),

   orig_table_name(item->orig_table_name),

   orig_field_name(item->orig_field_name),

   context(item->context),

   db_name(item->db_name),

   table_name(item->table_name),

   field_name(item->field_name),

   alias_name_used(item->alias_name_used),

   cached_field_index(item->cached_field_index),

   cached_table(item->cached_table),

   depended_from(item->depended_from)

{}

void Item_ident::cleanup()

{

  Item::cleanup();

  db_name= orig_db_name;

  table_name= orig_table_name;

  field_name= orig_field_name;

  depended_from= 0;

  return;

}

bool Item_ident::remove_dependence_processor(unsigned char * arg)

{

  if (depended_from == (Select_Lex *) arg)

    depended_from= 0;

  return(0);

}

const char *Item_ident::full_name() const

{

  char *tmp;

	size_t tmp_len;

  if (!table_name || !field_name)

    return field_name ? field_name : name ? name : "tmp_field";

  if (db_name && db_name[0])

  {

    tmp_len= strlen(db_name)+strlen(table_name)+strlen(field_name)+3;

    tmp= (char*) memory::sql_alloc(tmp_len);

    snprintf(tmp, tmp_len, "%s.%s.%s",db_name,table_name,field_name);

  }

  else

  {

    if (table_name[0])

    {

      tmp_len=strlen(table_name)+strlen(field_name)+2;

      tmp= (char*) memory::sql_alloc(tmp_len);

      snprintf(tmp, tmp_len, "%s.%s", table_name, field_name);

    }

    else

      tmp= (char*) field_name;

  }

  return tmp;

}

void Item_ident::print(String *str,

                       enum_query_type)

{

  string d_name, t_name;

  if (table_name && table_name[0])

  {

    t_name.assign(table_name);

    std::transform(t_name.begin(), t_name.end(),

                   t_name.begin(), ::tolower);

  }

  if (db_name && db_name[0])

  {

    d_name.assign(db_name);

    // Keeping the std:: prefix here, since Item_ident has a transform

    // method

      std::transform(d_name.begin(), d_name.end(),

                     d_name.begin(), ::tolower);

  }

  if (!table_name || !field_name || !field_name[0])

  {

    const char *nm= (field_name && field_name[0]) ?

                      field_name : name ? name : "tmp_field";

    str->append_identifier(nm, (uint32_t) strlen(nm));

    return;

  }

  if (db_name && db_name[0] && !alias_name_used)

  {

    {

      str->append_identifier(d_name.c_str(), d_name.length());

      str->append('.');

    }

    str->append_identifier(t_name.c_str(), t_name.length());

    str->append('.');

    str->append_identifier(field_name, (uint32_t)strlen(field_name));

  }

  else

  {

    if (table_name[0])

    {

      str->append_identifier(t_name.c_str(), t_name.length());

      str->append('.');

      str->append_identifier(field_name, (uint32_t) strlen(field_name));

    }

    else

      str->append_identifier(field_name, (uint32_t) strlen(field_name));

  }

}

double Item_ident_for_show::val_real()

{

  return field->val_real();

}

int64_t Item_ident_for_show::val_int()

{

  return field->val_int();

}

String *Item_ident_for_show::val_str(String *str)

{

  return field->val_str_internal(str);

}

type::Decimal *Item_ident_for_show::val_decimal(type::Decimal *dec)

{

  return field->val_decimal(dec);

}

void Item_ident_for_show::make_field(SendField *tmp_field)

{

  tmp_field->table_name= tmp_field->org_table_name= table_name;

  tmp_field->db_name= db_name;

  tmp_field->col_name= tmp_field->org_col_name= field->field_name;

  tmp_field->charsetnr= field->charset()->number;

  tmp_field->length=field->field_length;

  tmp_field->type=field->type();

  tmp_field->flags= field->getTable()->maybe_null ?

    (field->flags & ~NOT_NULL_FLAG) : field->flags;

  tmp_field->decimals= field->decimals();

}

} /* namespace drizzled */