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#-*- perl -*-
#
# Copyright (C) 2001 Ken'ichi Fukamachi
# All rights reserved. This program is free software; you can
# redistribute it and/or modify it under the same terms as Perl itself.
#
# $Id$
# $FML$
#
package IO::LogFileDB;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;
require Exporter;
@ISA = qw(Exporter);
sub new
{
my ($self, $args) = @_;
my ($type) = ref($self) || $self;
my $me = {};
$me->{ _file } = $args->{ file };
if ($args->{ first_match }) {
$me->{ _match_style } = 'first';
}
elsif ($args->{ last_match }) {
$me->{ _match_style } = 'last';
}
else {
$me->{ _match_style } = 'first';
}
return bless $me, $type;
}
sub TIEHASH
{
my ($self, $args) = @_;
my ($type) = ref($self) || $self;
new($self, $args);
}
sub grep
{
my ($self, $key) = @_;
my $rarray = $self->_fetch($key, 'array');
return @$rarray;
}
sub FETCH
{
my ($self, $key) = @_;
$self->_fetch($key, 'scalar');
}
sub STORE
{
my ($self, $key, $value) = @_;
}
sub _fetch
{
my ($self, $key, $mode) = @_;
my $prekey = $key;
# the first 1 byte of the key
if ($key =~ /^(.)/) { $prekey = $1;}
use IO::File;
my $fh = new IO::File;
$fh->open( $self->{ _file }, "r");
my ($xkey, $xvalue) = ();
my (@values) = ();
SEARCH:
while (<$fh>) {
next SEARCH if /^\#*$/;
next SEARCH if /^\s*$/;
next SEARCH unless /^$prekey/i;
next SEARCH unless /^$key/i;
chop;
($xkey, $xvalue) = split(/\s+/, $_, 2);
if ($xkey eq $key) {
if ($mode eq 'array') {
push(@values, $xvalue);
}
if ($mode eq 'scalar') {
# firstmatch: exit loop ASAP if the $key is found.
if ($self->{ _match_style } eq 'first') {
last SEARCH;
}
}
}
}
close($fh);
if ($mode eq 'scalar') {
return( $xvalue || undef );
}
if ($mode eq 'array') {
return \@values;
}
}
=head1 NAME
IO::LogFileDB.pm - what is this
=head1 SYNOPSIS
use IO::LogFileDB;
$db = new IO::LogFileDB { file => 'cache.txt' };
# all entries with the key = 'rudo'
@values = $db->grep( rudo );
or
use IO::LogFileDB;
tie %db, 'IO::LogFileDB', { file => 'cache.txt' };
print $db{ rudo }, "\n";
where cache file "cache.txt" format is "key value" for each line.
For example
rudo teddy bear
kenken north fox
.....
By default, FETCH() returns the first value with the key.
use IO::LogFileDB;
tie %db, 'IO::LogFileDB', { first_match => 1, file => 'cache.txt' };
print $db{ rudo }, "\n";
if you find the latest value (so at the later line somewhere in the
file) for the $key
use IO::LogFileDB;
tie %db, 'IO::LogFileDB', { last_match => 1, file => 'cache.txt' };
print $db{ rudo }, "\n";
=head1 DESCRIPTION
=head2 new
=item Function()
=head1 AUTHOR
Ken'ichi Fukamachi
=head1 COPYRIGHT
Copyright (C) 2001 Ken'ichi Fukamachi
All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
=head1 HISTORY
IO::LogFileDB.pm appeared in fml5.
=cut
1;
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