# Copyright (c) 1999-2009 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: Constraint.pm,v 2.5 2009/11/20 17:48:39 nagler Exp $
package Bivio::SQL::Constraint;
use strict;
use Bivio::Base 'Type.Enum';

our($VERSION) = sprintf('%d.%02d', q$Revision: 2.5 $ =~ /\d+/g);
my($_TE) = b_use('Bivio::TypeError');
my($_E) = b_use('Type.Enum');
__PACKAGE__->compile([
    NONE => [0],
    PRIMARY_KEY => [1],
    NOT_NULL => [2],
    NOT_NULL_UNIQUE => [3],
    NOT_ZERO_ENUM => [4],
    IS_SPECIFIED => [5],
]);

sub check_value {
    my($self, $type, $value) = @_;
    return
	if $self->eq_none;
    return $_TE->NULL
	unless defined($value);
    if ($self->equals_by_name(qw(NOT_ZERO_ENUM IS_SPECIFIED))) {
	return $_TE->UNSPECIFIED
	    unless $type->is_specified($value);
    }
    return;
}

1;