| 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; |