lib/WAIT/Index.pm

#                              -*- Mode: Cperl -*- 
# Index.pm -- 
# ITIID           : $ITI$ $Header $__Header$
# Author          : Ulrich Pfeifer
# Created On      : Thu Aug  8 13:05:10 1996
# Last Modified By: Ulrich Pfeifer
# Last Modified On: Sun Nov 22 18:44:43 1998
# Language        : CPerl
# Update Count    : 107
# Status          : Unknown, Use with caution!
# 
# Copyright (c) 1996-1997, Ulrich Pfeifer
# 

package WAIT::Index;
use WAIT::IndexScan;
use strict;
use DB_File;
use Fcntl;
use vars qw($VERSION);

$VERSION = "1.801"; # Table.pm tests if we are loaded by checking $VERSION

sub new {
  my $type = shift;
  my %parm = @_;
  my $self = {};

  unless ($self->{file} = $parm{file}) {
    require Carp;
    Carp::croak("No file specified");
  }
  unless ($self->{attr} = $parm{attr}) {
    require Carp;
    Carp::croak("No attributes specified");
  }
  bless $self, ref($type) || $type;
}

sub drop {
  my $self = shift;
  if ((caller)[0] eq 'WAIT::Table') { # Table knows about this
    my $file = $self->{file};
    ! (!-e $file or unlink $file);
  } else {                            # notify our database
    require Carp;
    Carp::croak(ref($self)."::drop called directly");
  }
}

sub open {
  my $self = shift;
  my $file = $self->{file};

  if (exists $self->{dbh}) {
    $self->{dbh};
  } else {
    $self->{dbh} = tie(%{$self->{db}}, 'DB_File', $file,
                       $self->{mode}, 0664, $DB_BTREE);
  }
}

sub insert {
  my $self  = shift;
  my $key   = shift;
  my %parm  = @_;

  defined $self->{db} or $self->open;

  my $tuple = join($;, map($parm{$_}, @{$self->{attr}}));

  if (exists $self->{db}->{$tuple}) {
    # duplicate entry
    return undef;
  }
  $self->{db}->{$tuple} = $key;
}

sub have {
  my $self  = shift;
  my %parm  = @_;

  defined $self->{db} or $self->open;

  my $tuple = join($;, map($parm{$_}, @{$self->{attr}}));

  exists $self->{db}->{$tuple} && $self->{db}->{$tuple};
}

sub fetch {
  my $self  = shift;
  my %parm  = @_;
  my @keys  = @{$self->{attr}->[0]};

  defined $self->{db} or $self->open;

  my $key   = join($;, map($parm{$_}, @keys));
  $self->{db}->{$key};
}

sub delete {
  my $self  = shift;
  my $key   = shift;
  my %parm  = @_;

  defined $self->{db} or $self->open;

  my $tuple = join($;, map($parm{$_}||"", @{$self->{attr}}));

  delete $self->{db}->{$tuple};
}

sub sync {
  my $self = shift;
  $self->{dbh}->sync if $self->{dbh};
}

sub close {
  my $self = shift;

  delete $self->{scans} if defined $self->{scans};

  if ($self->{dbh}) {
    delete $self->{dbh};
    untie %{$self->{db}};
    delete $self->{db};
  }
}

#sub DESTROY { $_[0]->close }

sub open_scan {
  my $self = shift;
  my $code = shift;

  $self->{dbh} or $self->open;
  new WAIT::IndexScan $self, $code;
}

1;
1	ulpfr	13	# -- Mode: Cperl --
2	ulpfr	10	# 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	laperla	29	use vars qw($VERSION);
21	ulpfr	10
22	laperla	29	$VERSION = "1.801"; # Table.pm tests if we are loaded by checking $VERSION
23
24	ulpfr	10	sub new {
25			my $type = shift;
26			my %parm = @_;
27			my $self = {};
28
29	ulpfr	13	unless ($self->{file} = $parm{file}) {
30			require Carp;
31			Carp::croak("No file specified");
32			}
33			unless ($self->{attr} = $parm{attr}) {
34			require Carp;
35			Carp::croak("No attributes specified");
36			}
37	ulpfr	10	bless $self, ref($type) \|\| $type;
38			}
39
40			sub drop {
41			my $self = shift;
42			if ((caller)[0] eq 'WAIT::Table') { # Table knows about this
43			my $file = $self->{file};
44			! (!-e $file or unlink $file);
45	ulpfr	13	} else { # notify our database
46			require Carp;
47			Carp::croak(ref($self)."::drop called directly");
48	ulpfr	10	}
49			}
50
51			sub open {
52			my $self = shift;
53			my $file = $self->{file};
54
55			if (exists $self->{dbh}) {
56			$self->{dbh};
57			} else {
58			$self->{dbh} = tie(%{$self->{db}}, 'DB_File', $file,
59			$self->{mode}, 0664, $DB_BTREE);
60			}
61			}
62
63			sub insert {
64			my $self = shift;
65			my $key = shift;
66			my %parm = @_;
67
68			defined $self->{db} or $self->open;
69
70			my $tuple = join($;, map($parm{$_}, @{$self->{attr}}));
71
72			if (exists $self->{db}->{$tuple}) {
73			# duplicate entry
74			return undef;
75			}
76			$self->{db}->{$tuple} = $key;
77			}
78
79			sub have {
80			my $self = shift;
81			my %parm = @_;
82
83			defined $self->{db} or $self->open;
84
85			my $tuple = join($;, map($parm{$_}, @{$self->{attr}}));
86
87			exists $self->{db}->{$tuple} && $self->{db}->{$tuple};
88			}
89
90			sub fetch {
91			my $self = shift;
92			my %parm = @_;
93			my @keys = @{$self->{attr}->[0]};
94	ulpfr	13
95	ulpfr	10	defined $self->{db} or $self->open;
96
97			my $key = join($;, map($parm{$_}, @keys));
98			$self->{db}->{$key};
99			}
100
101			sub delete {
102			my $self = shift;
103			my $key = shift;
104			my %parm = @_;
105
106			defined $self->{db} or $self->open;
107
108	ulpfr	19	my $tuple = join($;, map($parm{$_}\|\|"", @{$self->{attr}}));
109	ulpfr	13
110	ulpfr	10	delete $self->{db}->{$tuple};
111			}
112
113			sub sync {
114			my $self = shift;
115			$self->{dbh}->sync if $self->{dbh};
116			}
117
118			sub close {
119			my $self = shift;
120
121			delete $self->{scans} if defined $self->{scans};
122
123			if ($self->{dbh}) {
124			delete $self->{dbh};
125			untie %{$self->{db}};
126			delete $self->{db};
127			}
128			}
129
130			#sub DESTROY { $_[0]->close }
131
132			sub open_scan {
133			my $self = shift;
134			my $code = shift;
135	ulpfr	13
136	ulpfr	10	$self->{dbh} or $self->open;
137			new WAIT::IndexScan $self, $code;
138			}
139
140			1;