fcd15e0b |
1 | # -*-perl-*- |
2 | # |
3 | # $Id$ |
4 | # |
5 | # Caching for fields, curves, groups, ... |
6 | # |
7 | # (c) 2004 Straylight/Edgeware |
8 | # |
9 | |
10 | #----- Licensing notice ----------------------------------------------------- |
11 | # |
12 | # This file is part of the Perl interface to Catacomb. |
13 | # |
14 | # Catacomb/Perl is free software; you can redistribute it and/or modify |
15 | # it under the terms of the GNU General Public License as published by |
16 | # the Free Software Foundation; either version 2 of the License, or |
17 | # (at your option) any later version. |
18 | # |
19 | # Catacomb/Perl is distributed in the hope that it will be useful, |
20 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | # GNU General Public License for more details. |
23 | # |
24 | # You should have received a copy of the GNU General Public License |
25 | # along with Catacomb/Perl; if not, write to the Free Software Foundation, |
26 | # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | |
28 | package Catacomb::Cache::Ref; |
29 | |
30 | sub new { |
31 | my ($me, $c) = @_; |
32 | $c->[0]++; |
33 | return bless [$c], $me; |
34 | } |
35 | |
36 | sub DESTROY { |
37 | my ($me) = @_; |
38 | my $c = $me->[0]; |
39 | if ($c->[0] > 1) { $c->[0]--; return; } |
40 | delete $c->[1]{$c->[2]}; |
41 | } |
42 | |
43 | package Catacomb::Cache; |
44 | |
45 | $debug = 1; |
46 | |
47 | sub stringify { |
48 | my ($x) = @_; |
49 | if (ref($x) eq ARRAY) { |
50 | return "[" . join("/", map(stringify($_), @$x)) . "]"; |
51 | } else { |
52 | return $x; |
53 | } |
54 | } |
55 | |
56 | sub new { my ($me) = @_; return bless { }, $me; } |
57 | |
58 | sub intern { |
59 | my ($c, $x) = @_; |
60 | my $k = stringify($x->get()); |
61 | my $e; |
62 | if (exists($c->{$k})) { |
63 | $e = $c->{$k}; |
64 | } else { |
65 | $e = $c->{$k} = [0, $c, $k, $x]; |
66 | } |
67 | return $e->[3], Catacomb::Cache::Ref->new($e); |
68 | } |
69 | |
70 | #----- That's all, folks ---------------------------------------------------- |
71 | |
72 | 1; |