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use WebPAC::Common; |
use WebPAC::Common; |
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use base qw/WebPAC::Common/; |
use base qw/WebPAC::Common/; |
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use Text::Iconv; |
use Text::Iconv; |
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use Data::Dumper; |
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=head1 NAME |
=head1 NAME |
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=head1 VERSION |
=head1 VERSION |
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Version 0.03 |
Version 0.05 |
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=cut |
=cut |
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our $VERSION = '0.03'; |
our $VERSION = '0.05'; |
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=head1 SYNOPSIS |
=head1 SYNOPSIS |
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); |
); |
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$db->open('/path/to/database'); |
$db->open('/path/to/database'); |
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print "database size: ",$db->size,"\n"; |
print "database size: ",$db->size,"\n"; |
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while (my $rec = $db->fetch) { |
while (my $rec = $db->fetch) { |
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} |
# do something with $rec |
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} |
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module => 'WebPAC::Input::MARC', |
module => 'WebPAC::Input::MARC', |
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code_page => 'ISO-8859-2', |
code_page => 'ISO-8859-2', |
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low_mem => 1, |
low_mem => 1, |
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recode => 'char pairs', |
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no_progress_bar => 1, |
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); |
); |
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C<module> is low-level file format module. See L<WebPAC::Input::Isis> and |
C<module> is low-level file format module. See L<WebPAC::Input::Isis> and |
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Default is not to use C<low_mem> options (see L<MEMORY USAGE> below). |
Default is not to use C<low_mem> options (see L<MEMORY USAGE> below). |
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C<recode> is optional string constisting of character or words pairs that |
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should be replaced in input stream. |
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C<no_progress_bar> disables progress bar output on C<STDOUT> |
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This function will also call low-level C<init> if it exists with same |
This function will also call low-level C<init> if it exists with same |
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parametars. |
parametars. |
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limit => 500, |
limit => 500, |
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offset => 6000, |
offset => 6000, |
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lookup => $lookup_obj, |
lookup => $lookup_obj, |
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stats => 1, |
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); |
); |
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By default, C<code_page> is assumed to be C<852>. |
By default, C<code_page> is assumed to be C<852>. |
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C<limit> is optional parametar to read just C<limit> records from database |
C<limit> is optional parametar to read just C<limit> records from database |
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C<stats> create optional report about usage of fields and subfields |
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Returns size of database, regardless of C<offset> and C<limit> |
Returns size of database, regardless of C<offset> and C<limit> |
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parametars, see also C<size>. |
parametars, see also C<size>. |
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# create Text::Iconv object |
# create Text::Iconv object |
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$self->{iconv} = Text::Iconv->new($code_page,$self->{'code_page'}); |
$self->{iconv} = Text::Iconv->new($code_page,$self->{'code_page'}); |
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my $filter_ref; |
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if ($self->{recode}) { |
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my @r = split(/\s/, $self->{recode}); |
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if ($#r % 2 != 1) { |
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$log->logwarn("recode needs even number of elements (some number of valid pairs)"); |
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} else { |
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my $recode; |
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while (@r) { |
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my $from = shift @r; |
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my $to = shift @r; |
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$recode->{$from} = $to; |
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} |
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my $regex = join '|' => keys %{ $recode }; |
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$log->debug("using recode regex: $regex"); |
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$filter_ref = sub { |
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my $t = shift; |
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$t =~ s/($regex)/$recode->{$1}/g; |
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return $t; |
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}; |
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} |
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} |
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my ($db, $size) = $self->{open_db}->( $self, |
my ($db, $size) = $self->{open_db}->( $self, |
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path => $arg->{path}, |
path => $arg->{path}, |
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filter => $filter_ref, |
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); |
); |
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unless ($db) { |
unless (defined($db)) { |
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$log->logwarn("can't open database $arg->{path}, skipping..."); |
$log->logwarn("can't open database $arg->{path}, skipping..."); |
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return; |
return; |
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} |
} |
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return; |
return; |
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} |
} |
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my $offset = 1; |
my $from_rec = 1; |
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my $limit = $size; |
my $to_rec = $size; |
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if (my $s = $self->{offset}) { |
if (my $s = $self->{offset}) { |
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$log->info("skipping to MFN $s"); |
$log->info("skipping to MFN $s"); |
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$offset = $s; |
$from_rec = $s; |
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} else { |
} else { |
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$self->{offset} = $offset; |
$self->{offset} = $from_rec; |
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} |
} |
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if ($self->{limit}) { |
if ($self->{limit}) { |
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$log->debug("limiting to ",$self->{limit}," records"); |
$log->debug("limiting to ",$self->{limit}," records"); |
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$limit = $offset + $self->{limit} - 1; |
$to_rec = $from_rec + $self->{limit} - 1; |
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$limit = $size if ($limit > $size); |
$to_rec = $size if ($to_rec > $size); |
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} |
} |
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# store size for later |
# store size for later |
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$self->{size} = ($limit - $offset) ? ($limit - $offset + 1) : 0; |
$self->{size} = ($to_rec - $from_rec) ? ($to_rec - $from_rec + 1) : 0; |
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$log->info("processing $self->{size} records in $code_page, convert to $self->{code_page}"); |
$log->info("processing $self->{size}/$size records [$from_rec-$to_rec] convert $code_page -> $self->{code_page}", $self->{stats} ? ' [stats]' : ''); |
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# read database |
# read database |
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for (my $pos = $offset; $pos <= $limit; $pos++) { |
for (my $pos = $from_rec; $pos <= $to_rec; $pos++) { |
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$log->debug("position: $pos\n"); |
$log->debug("position: $pos\n"); |
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my $rec = $self->{fetch_rec}->($self, $db, $pos ); |
my $rec = $self->{fetch_rec}->($self, $db, $pos ); |
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$log->debug(sub { Dumper($rec) }); |
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if (! $rec) { |
if (! $rec) { |
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$log->warn("record $pos empty? skipping..."); |
$log->warn("record $pos empty? skipping..."); |
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next; |
next; |
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# create lookup |
# create lookup |
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$self->{'lookup'}->add( $rec ) if ($rec && $self->{'lookup'}); |
$self->{'lookup'}->add( $rec ) if ($rec && $self->{'lookup'}); |
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$self->progress_bar($pos,$limit); |
# update counters for statistics |
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if ($self->{stats}) { |
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map { |
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my $fld = $_; |
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$self->{_stats}->{fld}->{ $fld }++; |
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if (ref($rec->{ $fld }) eq 'ARRAY') { |
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map { |
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if (ref($_) eq 'HASH') { |
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map { |
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$self->{_stats}->{sf}->{ $fld }->{ $_ }++; |
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} keys %{ $_ }; |
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} else { |
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$self->{_stats}->{repeatable}->{ $fld }++; |
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} |
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} @{ $rec->{$fld} }; |
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} |
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} keys %{ $rec }; |
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} |
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$self->progress_bar($pos,$to_rec) unless ($self->{no_progress_bar}); |
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} |
} |
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$self->{last_pcnt} = 0; |
$self->{last_pcnt} = 0; |
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# store max mfn and return it. |
# store max mfn and return it. |
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$self->{max_pos} = $limit; |
$self->{max_pos} = $to_rec; |
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$log->debug("max_pos: $limit"); |
$log->debug("max_pos: $to_rec"); |
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return $size; |
return $size; |
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} |
} |
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return; |
return; |
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} |
} |
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$self->progress_bar($mfn,$self->{max_pos}); |
$self->progress_bar($mfn,$self->{max_pos}) unless ($self->{no_progress_bar}); |
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my $rec; |
my $rec; |
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return $self->{pos} = (($pos - 1) || -1); |
return $self->{pos} = (($pos - 1) || -1); |
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} |
} |
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=head2 stats |
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Dump statistics about field and subfield usage |
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print Dumper( $input->stats ); |
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=cut |
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sub stats { |
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my $self = shift; |
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return $self->{_stats}; |
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} |
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=head1 MEMORY USAGE |
=head1 MEMORY USAGE |
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