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# -*- Mode: Perl -*- |
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# Index.pm -- |
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# ITIID : $ITI$ $Header $__Header$ |
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# Author : Ulrich Pfeifer |
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# Created On : Thu Aug 8 13:05:10 1996 |
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# Last Modified By: Ulrich Pfeifer |
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# Last Modified On: Sun Nov 22 18:44:43 1998 |
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# Language : CPerl |
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# Update Count : 107 |
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# Status : Unknown, Use with caution! |
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# |
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# Copyright (c) 1996-1997, Ulrich Pfeifer |
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# |
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|
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package WAIT::Index; |
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use WAIT::IndexScan; |
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use strict; |
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use DB_File; |
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use Fcntl; |
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|
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sub fail { |
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$@ .= join "\n", @_; |
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return undef; |
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} |
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|
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sub new { |
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my $type = shift; |
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my %parm = @_; |
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my $self = {}; |
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|
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$self->{file} = $parm{file} or return fail("No file specified"); |
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$self->{attr} = $parm{attr} or return fail("No attributes specified"); |
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bless $self, ref($type) || $type; |
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} |
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|
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sub drop { |
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my $self = shift; |
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if ((caller)[0] eq 'WAIT::Table') { # Table knows about this |
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my $file = $self->{file}; |
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|
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! (!-e $file or unlink $file); |
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} else { # notify our database |
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fail ref($self)."::drop called directly"; |
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} |
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} |
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|
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sub open { |
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my $self = shift; |
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my $file = $self->{file}; |
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|
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if (exists $self->{dbh}) { |
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$self->{dbh}; |
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} else { |
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$self->{dbh} = tie(%{$self->{db}}, 'DB_File', $file, |
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$self->{mode}, 0664, $DB_BTREE); |
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} |
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} |
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|
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sub insert { |
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my $self = shift; |
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my $key = shift; |
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my %parm = @_; |
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|
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defined $self->{db} or $self->open; |
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|
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my $tuple = join($;, map($parm{$_}, @{$self->{attr}})); |
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|
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if (exists $self->{db}->{$tuple}) { |
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# duplicate entry |
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return undef; |
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} |
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$self->{db}->{$tuple} = $key; |
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} |
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|
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sub have { |
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my $self = shift; |
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my %parm = @_; |
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|
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defined $self->{db} or $self->open; |
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|
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my $tuple = join($;, map($parm{$_}, @{$self->{attr}})); |
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|
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exists $self->{db}->{$tuple} && $self->{db}->{$tuple}; |
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} |
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|
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sub fetch { |
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my $self = shift; |
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my %parm = @_; |
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my @keys = @{$self->{attr}->[0]}; |
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|
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defined $self->{db} or $self->open; |
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|
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my $key = join($;, map($parm{$_}, @keys)); |
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$self->{db}->{$key}; |
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} |
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|
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sub delete { |
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my $self = shift; |
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my $key = shift; |
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my %parm = @_; |
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|
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defined $self->{db} or $self->open; |
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|
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my $tuple = join($;, map($parm{$_}, @{$self->{attr}})); |
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|
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delete $self->{db}->{$tuple}; |
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} |
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|
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sub sync { |
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my $self = shift; |
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$self->{dbh}->sync if $self->{dbh}; |
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} |
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|
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sub close { |
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my $self = shift; |
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|
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delete $self->{scans} if defined $self->{scans}; |
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|
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if ($self->{dbh}) { |
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delete $self->{dbh}; |
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untie %{$self->{db}}; |
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delete $self->{db}; |
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} |
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} |
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|
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#sub DESTROY { $_[0]->close } |
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|
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sub open_scan { |
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my $self = shift; |
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my $code = shift; |
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|
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$self->{dbh} or $self->open; |
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new WAIT::IndexScan $self, $code; |
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} |
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|
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1; |
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