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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 FML::SequenceFile;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK);
use Carp;
use FML::Errors qw(error_reason error error_reset);
require Exporter;
@ISA = qw(Exporter);
sub new
{
my ($self, $args) = @_;
my ($type) = ref($self) || $self;
my $me = {};
$me->{ _sequence_file } = $args->{ sequence_file };
return bless $me, $type;
}
sub increment_id
{
my ($self, $file) = @_;
my $id = 0;
my $seq_file = $file || $self->{ _sequence_file };
unless ($seq_file) {
$self->error_reason("the sequence file is not specified");
return 0;
};
# touch the sequence file if it does not exist.
unless (-f $seq_file) {
use FML::Utils qw(touch);
touch($seq_file);
};
use IO::File::Atomic;
my ($rh, $wh) = IO::File::Atomic->rw_open($seq_file);
# read the current sequence number
if (defined $rh) {
$id = $rh->getline;
$rh->close;
}
else {
$self->error_reason("cannot open the sequence file");
return 0;
}
# increment $id. The incremented number is the current article ID.
$id++;
# save $id
print $wh $id, "\n";
$wh->close;
$id;
}
=head1 NAME
FML::SequenceFile.pm - what is this
=head1 SYNOPSIS
=head1 DESCRIPTION
=head2 new
=item Function()
=head1 AUTHOR
=head1 COPYRIGHT
Copyright (C) 2001 __YOUR_NAME__
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
FML::SequenceFile.pm appeared in fml5.
=cut
1;
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