2 # Hash tied to restrict access to the specified keys list.
3 # Copyright (C) 2005 Jan Kratochvil <project-www.jankratochvil.net@jankratochvil.net>
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; exactly version 2 of June 1991 is required
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 # GNU General Public License for more details.
14 # You should have received a copy of the GNU General Public License
15 # along with this program; if not, write to the Free Software
16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 package My::Hash::RestrictTo;
20 our $VERSION=do { my @r=(q$Revision$=~/\d+/g); sprintf "%d.".("%03d"x$#r),@r; };
24 use My::Web; # for &Wrequire
26 our @ISA=qw(My::Hash);
27 use Carp qw(cluck confess);
32 my($class,$parent,@keys)=@_;
34 my $self=$class->SUPER::TIEHASH($parent);
35 $self->{"keyshash"}={ map(($_=>1),@keys) };
41 my($this,$key,$value)=@_;
43 confess "Key not permitted: $key" if !$this->{"keyshash"}{$key};
44 return $this->pass("STORE",$key,$value);
51 confess "Key not permitted: $key" if !$this->{"keyshash"}{$key};
52 return $this->pass("FETCH",$key);
59 my $a=keys(%{$this->{"keyshash"}});
60 return $this->NEXTKEY($this,undef());
65 my($this,$lastkey)=@_;
67 cluck "TODO: Enumeration may not be expected.";
69 my $key=each(%{$this->{"keyshash"}});
70 return if !defined $key;
71 return $key if exists $this->{"parent"}{$key};
79 confess "Key not permitted: $key" if !$this->{"keyshash"}{$key};
80 return $this->pass("EXISTS",$key);
87 confess "Key not permitted: $key" if !$this->{"keyshash"}{$key};
88 return $this->pass("DELETE",$key);
95 cluck "TODO: Enumeration may not be expected.";
96 delete $this->{"parent"}{$_} for keys(%{$this->{"keyshash"}});
103 confess "TODO: Not yet implemented.";