# Copyright (c) 1999-2007 bivio Software, Inc.  All rights reserved.
#
# Visit http://www.bivio.biz for more info.
# 
# This library is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of the
# License, or (at your option) any later version.
# 
# This library 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
# Lesser General Public License for more details.
# 
# You should have received a copy of the GNU Lesser General Public
# License along with this library;  If not, you may get a copy from:
# http://www.opensource.org/licenses/lgpl-license.html
# 
# $Id: Boolean.pm,v 2.5 2010/08/25 17:02:54 moeller Exp $
package Bivio::Type::Boolean;
use strict;
use Bivio::Base 'Bivio::Type::Integer';

our($VERSION) = sprintf('%d.%02d', q$Revision: 2.5 $ =~ /\d+/g);

sub FALSE {
    return 0;
}

sub TRUE {
    return 1;
}

sub can_be_negative {
    return 0;
}

sub can_be_positive {
    return 1;
}

sub can_be_zero {
    return 1;
}

sub from_literal {
    my($res, $err) = shift->SUPER::from_literal(@_);
    if ($err) {
	my($v) = @_;
	if ($v =~ /^\s*(?:y|yes|t|true|on)\s*$/i) {
	    $res = 1;
	}
	elsif ($v =~ /^\s*(?:n|no|f|false|off)\s*$/i) {
	    $res = 0;
	}
    }
    # Booleans are never non-null.  Always returns 0 or 1 or error.
    return defined($res) ? $res : $err ? ($res, $err) : 0;
}

sub get_decimals {
    return 0;
}

sub get_default {
    return 0;
}

sub get_max {
    return 1;
}

sub get_min {
    return 0;
}

sub get_precision {
    return 1;
}

sub get_width {
    return 1;
}

sub to_sql_param {
    shift;
    my($v) = shift;
    return !defined($v) ? undef : $v ? '1' : '0';
}

sub to_xml {
    my($proto, $value) = @_;
    return !defined($value) ? '' : $value ? 'true' : 'false';
}

1;