#
# 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::Filter::Group;
$VERSION=0.8;
use Carp;
use overload 'fallback' => 1;
use base 'ORM::Filter';
##
## CONSTRUCTORS
##
sub new
{
my $class = shift;
my $op = shift;
my @arg = @_;
my $self = bless { op=>$op, arg=>[] }, $class;
$self->add_expr( @arg );
return $self;
}
##
## PROPERTIES
##
sub _sql_str
{
my $self = shift;
my %arg = @_;
my $sql;
for my $arg ( @{$self->{arg}} )
{
my $add = $arg->_sql_str( tjoin=>$arg{tjoin} );
$sql .= " $self->{op} " if( $sql && $add );
$sql .= $add;
}
return $sql && "($sql)";
}
sub _tjoin
{
my $self = shift;
my $tjoin = ORM::Tjoin->new;
for my $arg ( @{$self->{arg}} )
{
$tjoin->merge( $arg->_tjoin );
}
return $tjoin;
}
##
## METHODS
##
sub add_expr
{
my $self = shift;
my @arg = @_;
for( my $i=0; $i<@arg; $i++ )
{
if( ! defined $arg[$i] )
{
splice @arg, $i, 1;
$i--;
}
elsif( ! ref $arg[$i] || !$arg[$i]->can( '_tjoin' ) )
{
croak "Bad arg #".($i+1).": '$arg[$i]'";
}
}
push @{$self->{arg}}, @arg;
return undef;
}