~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/select_to_file.h>

/*

 List of all possible characters of a numeric value text representation.

*/

#define NUMERIC_CHARS ".0123456789e+-"

namespace drizzled

{

class select_export :

  public select_to_file

{

  uint32_t field_term_length;

  int field_sep_char,escape_char,line_sep_char;

  int field_term_char; // first char of FIELDS TERMINATED BY or MAX_INT

  /*

    The is_ambiguous_field_sep field is true if a value of the field_sep_char

    field is one of the 'n', 't', 'r' etc characters

    (see the READ_INFO::unescape method and the ESCAPE_CHARS constant value).

  */

  bool is_ambiguous_field_sep;

  /*

     The is_ambiguous_field_term is true if field_sep_char contains the first

     char of the FIELDS TERMINATED BY (ENCLOSED BY is empty), and items can

     contain this character.

  */

  bool is_ambiguous_field_term;

  /*

    The is_unsafe_field_sep field is true if a value of the field_sep_char

    field is one of the '0'..'9', '+', '-', '.' and 'e' characters

    (see the NUMERIC_CHARS constant value).

  */

  bool is_unsafe_field_sep;

  bool fixed_row_size;

public:

  select_export(file_exchange *ex) :

    select_to_file(ex),

    field_term_length(0),

    field_sep_char(0),

    escape_char(0),

    line_sep_char(0),

    field_term_char(0),

    is_ambiguous_field_sep(0),

    is_ambiguous_field_term(0),

    is_unsafe_field_sep(0),

    fixed_row_size(0)

  {}

  ~select_export();

  int prepare(List<Item> &list, Select_Lex_Unit *u);

  bool send_data(List<Item> &items);

private:

  inline bool needs_escaping(char character, bool enclosed)

  {

    if ((character == escape_char) ||

        (enclosed ? character == field_sep_char : character == field_term_char) ||

        character == line_sep_char  ||

        (character == 0))

      return true;

    return false;

  }

};

} /* namespace drizzled */