#
# DESCRIPTION
#   PerlORM - Object relational mapper (ORM) for Perl. PerlORM is Perl
#   library that implements object-relational mapping. Its features are
#   much similar to those of Java's Hibernate library, but interface is
#   much different and easier to use.
#
# AUTHOR
#   Alexey V. Akimov <akimov_alexey@sourceforge.net>
#
# COPYRIGHT
#   Copyright (C) 2005-2006 Alexey V. Akimov
#
#   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, write to the Free Software
#   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#

package ORM::TjoinNull;

$VERSION = 0.81;

sub new
{
    my $class = shift;
    my %arg   = @_;
    my $self  = {};

    $self->{null_class} = $arg{null_class} if( $arg{null_class} );

    return bless $self, $class;
}

sub copy { $_[0]; }

sub merge
{
    my $self  = shift;
    my $tjoin = shift;
    my $copy  = $tjoin->copy;

    %{$self} = %{$copy};
    bless $self, ref $copy;
}

sub null_class { shift->{null_class}; }