# $Id$
# Hash tied to optionally dynamically generate its values
# Copyright (C) 2005 Jan Kratochvil <project-www.jankratochvil.net@jankratochvil.net>
# 
# 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; exactly version 2 of June 1991 is required
# 
# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


package My::Hash::Sub;
our $VERSION=do { my @r=(q$Revision$=~/\d+/g); sprintf "%d.".("%03d"x$#r),@r; };
our $CVS_ID=q$Id$;
use strict;
use warnings;
require Tie::Hash;	# for Tie::StdHash
our @ISA=qw(Tie::StdHash);
use Carp qw(cluck confess);


sub FETCH($$)
{
my($this,$key)=@_;

	my $val=$this->SUPER::FETCH($key);
	return $val if $key=~/_sub$/;	# force
	return $val if !defined $val;	# 1-item array is intentional.
	return $val if "CODE" ne ref $val;
	return &{$val}($this,$key);
}

sub STORE
{
my($this,$key,$value)=@_;

	return $this->SUPER::STORE($key,$value) if $key!~/_push$/;
	my $val_orig=$this->SUPER::FETCH($key);
	$val_orig=[] if !defined $val_orig;
	$val_orig=[$val_orig] if "ARRAY" ne ref $val_orig;
	return $this->SUPER::STORE($key,[@$val_orig,$value]);
}

1;