1 |
ulpfr |
10 |
# -*- Mode: Perl -*- |
2 |
|
|
# Index.pm -- |
3 |
|
|
# ITIID : $ITI$ $Header $__Header$ |
4 |
|
|
# Author : Ulrich Pfeifer |
5 |
|
|
# Created On : Thu Aug 8 13:05:10 1996 |
6 |
|
|
# Last Modified By: Ulrich Pfeifer |
7 |
|
|
# Last Modified On: Sun Nov 22 18:44:43 1998 |
8 |
|
|
# Language : CPerl |
9 |
|
|
# Update Count : 107 |
10 |
|
|
# Status : Unknown, Use with caution! |
11 |
|
|
# |
12 |
|
|
# Copyright (c) 1996-1997, Ulrich Pfeifer |
13 |
|
|
# |
14 |
|
|
|
15 |
|
|
package WAIT::Index; |
16 |
|
|
use WAIT::IndexScan; |
17 |
|
|
use strict; |
18 |
|
|
use DB_File; |
19 |
|
|
use Fcntl; |
20 |
|
|
|
21 |
|
|
sub fail { |
22 |
|
|
$@ .= join "\n", @_; |
23 |
|
|
return undef; |
24 |
|
|
} |
25 |
|
|
|
26 |
|
|
sub new { |
27 |
|
|
my $type = shift; |
28 |
|
|
my %parm = @_; |
29 |
|
|
my $self = {}; |
30 |
|
|
|
31 |
|
|
$self->{file} = $parm{file} or return fail("No file specified"); |
32 |
|
|
$self->{attr} = $parm{attr} or return fail("No attributes specified"); |
33 |
|
|
bless $self, ref($type) || $type; |
34 |
|
|
} |
35 |
|
|
|
36 |
|
|
sub drop { |
37 |
|
|
my $self = shift; |
38 |
|
|
if ((caller)[0] eq 'WAIT::Table') { # Table knows about this |
39 |
|
|
my $file = $self->{file}; |
40 |
|
|
|
41 |
|
|
! (!-e $file or unlink $file); |
42 |
|
|
} else { # notify our database |
43 |
|
|
fail ref($self)."::drop called directly"; |
44 |
|
|
} |
45 |
|
|
} |
46 |
|
|
|
47 |
|
|
sub open { |
48 |
|
|
my $self = shift; |
49 |
|
|
my $file = $self->{file}; |
50 |
|
|
|
51 |
|
|
if (exists $self->{dbh}) { |
52 |
|
|
$self->{dbh}; |
53 |
|
|
} else { |
54 |
|
|
$self->{dbh} = tie(%{$self->{db}}, 'DB_File', $file, |
55 |
|
|
$self->{mode}, 0664, $DB_BTREE); |
56 |
|
|
} |
57 |
|
|
} |
58 |
|
|
|
59 |
|
|
sub insert { |
60 |
|
|
my $self = shift; |
61 |
|
|
my $key = shift; |
62 |
|
|
my %parm = @_; |
63 |
|
|
|
64 |
|
|
defined $self->{db} or $self->open; |
65 |
|
|
|
66 |
|
|
my $tuple = join($;, map($parm{$_}, @{$self->{attr}})); |
67 |
|
|
|
68 |
|
|
if (exists $self->{db}->{$tuple}) { |
69 |
|
|
# duplicate entry |
70 |
|
|
return undef; |
71 |
|
|
} |
72 |
|
|
$self->{db}->{$tuple} = $key; |
73 |
|
|
} |
74 |
|
|
|
75 |
|
|
sub have { |
76 |
|
|
my $self = shift; |
77 |
|
|
my %parm = @_; |
78 |
|
|
|
79 |
|
|
defined $self->{db} or $self->open; |
80 |
|
|
|
81 |
|
|
my $tuple = join($;, map($parm{$_}, @{$self->{attr}})); |
82 |
|
|
|
83 |
|
|
exists $self->{db}->{$tuple} && $self->{db}->{$tuple}; |
84 |
|
|
} |
85 |
|
|
|
86 |
|
|
sub fetch { |
87 |
|
|
my $self = shift; |
88 |
|
|
my %parm = @_; |
89 |
|
|
my @keys = @{$self->{attr}->[0]}; |
90 |
|
|
|
91 |
|
|
defined $self->{db} or $self->open; |
92 |
|
|
|
93 |
|
|
my $key = join($;, map($parm{$_}, @keys)); |
94 |
|
|
$self->{db}->{$key}; |
95 |
|
|
} |
96 |
|
|
|
97 |
|
|
sub delete { |
98 |
|
|
my $self = shift; |
99 |
|
|
my $key = shift; |
100 |
|
|
my %parm = @_; |
101 |
|
|
|
102 |
|
|
defined $self->{db} or $self->open; |
103 |
|
|
|
104 |
|
|
my $tuple = join($;, map($parm{$_}, @{$self->{attr}})); |
105 |
|
|
|
106 |
|
|
delete $self->{db}->{$tuple}; |
107 |
|
|
} |
108 |
|
|
|
109 |
|
|
sub sync { |
110 |
|
|
my $self = shift; |
111 |
|
|
$self->{dbh}->sync if $self->{dbh}; |
112 |
|
|
} |
113 |
|
|
|
114 |
|
|
sub close { |
115 |
|
|
my $self = shift; |
116 |
|
|
|
117 |
|
|
delete $self->{scans} if defined $self->{scans}; |
118 |
|
|
|
119 |
|
|
if ($self->{dbh}) { |
120 |
|
|
delete $self->{dbh}; |
121 |
|
|
untie %{$self->{db}}; |
122 |
|
|
delete $self->{db}; |
123 |
|
|
} |
124 |
|
|
} |
125 |
|
|
|
126 |
|
|
#sub DESTROY { $_[0]->close } |
127 |
|
|
|
128 |
|
|
sub open_scan { |
129 |
|
|
my $self = shift; |
130 |
|
|
my $code = shift; |
131 |
|
|
|
132 |
|
|
$self->{dbh} or $self->open; |
133 |
|
|
new WAIT::IndexScan $self, $code; |
134 |
|
|
} |
135 |
|
|
|
136 |
|
|
1; |