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package WebPAC::Input::ISIS; |
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|
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use warnings; |
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use strict; |
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|
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use WebPAC::Common; |
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use base qw/WebPAC::Input WebPAC::Common/; |
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use Text::Iconv; |
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|
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=head1 NAME |
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|
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WebPAC::Input::ISIS - support for CDS/ISIS source files |
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|
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=head1 VERSION |
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|
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Version 0.01 |
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|
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=cut |
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|
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our $VERSION = '0.01'; |
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|
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|
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# auto-configure |
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|
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my ($have_biblio_isis, $have_openisis) = (0,0); |
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|
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eval "use Biblio::Isis 0.13;"; |
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unless ($@) { |
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$have_biblio_isis = 1 |
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} else { |
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eval "use OpenIsis;"; |
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$have_openisis = 1 unless ($@); |
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} |
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|
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=head1 SYNOPSIS |
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|
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Open CDS/ISIS, WinISIS or IsisMarc database using Biblio::Isis or OpenIsis |
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module and read all records to memory. |
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|
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my $isis = new WebPAC::Input::ISIS(); |
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$isis->open( filename => '/path/to/ISIS/ISIS' ); |
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|
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=head1 FUNCTIONS |
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|
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=head2 open |
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|
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This function will read whole database in memory and produce lookups. |
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|
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$isis->open( |
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filename => '/data/ISIS/ISIS', |
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code_page => '852', |
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limit_mfn => 500, |
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start_mfn => 6000, |
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lookup => $lookup_obj, |
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); |
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|
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By default, ISIS code page is assumed to be C<852>. |
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|
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If optional parametar C<start_mfn> is set, this will be first MFN to read |
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from database (so you can skip beginning of your database if you need to). |
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|
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If optional parametar C<limit_mfn> is set, it will read just 500 records |
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from database in example above. |
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|
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Returns size of database, regardless of C<start_mfn> and C<limit_mfn> |
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parametars, see also C<$isis->size>. |
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|
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=cut |
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|
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sub open { |
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my $self = shift; |
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my $arg = {@_}; |
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|
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my $log = $self->_get_logger(); |
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|
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$log->logcroak("need filename") if (! $arg->{'filename'}); |
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my $code_page = $arg->{'code_page'} || '852'; |
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|
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# store data in object |
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$self->{'isis_code_page'} = $code_page; |
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foreach my $v (qw/isis_filename start_mfn limit_mfn/) { |
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$self->{$v} = $arg->{$v} if ($arg->{$v}); |
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} |
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|
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# create Text::Iconv object |
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my $cp = Text::Iconv->new($code_page,$self->{'code_page'}); |
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|
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$log->info("reading ISIS database '",$arg->{'filename'},"'"); |
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$log->debug("isis code page: $code_page"); |
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|
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my ($isis_db,$db_size); |
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|
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if ($have_openisis) { |
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$log->debug("using OpenIsis perl bindings"); |
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$isis_db = OpenIsis::open($arg->{'filename'}); |
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$db_size = OpenIsis::maxRowid( $isis_db ) || 1; |
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} elsif ($have_biblio_isis) { |
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$log->debug("using Biblio::Isis"); |
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use Biblio::Isis; |
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$isis_db = new Biblio::Isis( |
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isisdb => $arg->{'filename'}, |
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include_deleted => 1, |
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hash_filter => sub { |
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my $l = shift || return; |
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$l = $cp->convert($l); |
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return $l; |
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}, |
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) or $log->logdie("can't find database ",$arg->{'filename'}); |
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|
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$db_size = $isis_db->count; |
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|
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unless ($db_size) { |
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$log->logwarn("no records in database ", $arg->{'filename'}, ", skipping..."); |
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return; |
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} |
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|
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} else { |
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$log->logdie("Can't find supported ISIS library for perl. I suggent that you install Bilbio::Isis from CPAN."); |
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} |
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|
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|
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my $startmfn = 1; |
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my $maxmfn = $db_size; |
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|
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if (my $s = $self->{'start_mfn'}) { |
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$log->info("skipping to MFN $s"); |
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$startmfn = $s; |
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} else { |
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$self->{'start_mfn'} = $startmfn; |
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} |
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|
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if ($self->{limit_mfn}) { |
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$log->info("limiting to ",$self->{limit_mfn}," records"); |
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$maxmfn = $startmfn + $self->{limit_mfn} - 1; |
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$maxmfn = $db_size if ($maxmfn > $db_size); |
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} |
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|
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# store size for later |
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$self->{'size'} = ($maxmfn - $startmfn) ? ($maxmfn - $startmfn + 1) : 0; |
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|
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$log->info("processing ",($maxmfn-$startmfn)." records using ",( $have_openisis ? 'OpenIsis' : 'Biblio::Isis')); |
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|
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|
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# read database |
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for (my $mfn = $startmfn; $mfn <= $maxmfn; $mfn++) { |
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|
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$log->debug("mfn: $mfn\n"); |
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|
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my $rec; |
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|
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if ($have_openisis) { |
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|
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# read record using OpenIsis |
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my $row = OpenIsis::read( $isis_db, $mfn ); |
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foreach my $k (keys %{$row}) { |
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if ($k ne "mfn") { |
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foreach my $l (@{$row->{$k}}) { |
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$l = $cp->convert($l); |
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# has subfields? |
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my $val; |
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if ($l =~ m/\^/) { |
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foreach my $t (split(/\^/,$l)) { |
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next if (! $t); |
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$val->{substr($t,0,1)} = substr($t,1); |
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} |
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} else { |
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$val = $l; |
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} |
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|
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push @{$rec->{$k}}, $val; |
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} |
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} else { |
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push @{$rec->{'000'}}, $mfn; |
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} |
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} |
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|
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} elsif ($have_biblio_isis) { |
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$rec = $isis_db->to_hash($mfn); |
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} else { |
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$log->logdie("hum? implementation missing?"); |
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} |
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|
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if (! $rec) { |
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$log->warn("record $mfn empty? skipping..."); |
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next; |
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} |
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|
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# store |
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if ($self->{'low_mem'}) { |
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$self->{'db'}->put($mfn, $rec); |
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} else { |
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$self->{'data'}->{$mfn} = $rec; |
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} |
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|
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# create lookup |
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$self->{'lookup'}->add( $rec ) if ($rec && $self->{'lookup'}); |
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|
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$self->progress_bar($mfn,$maxmfn); |
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|
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} |
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|
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$self->{'current_mfn'} = -1; |
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$self->{'last_pcnt'} = 0; |
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|
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$log->debug("max mfn: $maxmfn"); |
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|
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# store max mfn and return it. |
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$self->{'max_mfn'} = $maxmfn; |
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|
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return $db_size; |
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} |
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|
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=head2 fetch |
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Fetch next record from database. It will also displays progress bar. |
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|
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my $rec = $isis->fetch; |
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|
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Record from this function should probably go to C<data_structure> for |
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normalisation. |
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|
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=cut |
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|
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sub fetch { |
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my $self = shift; |
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|
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my $log = $self->_get_logger(); |
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|
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$log->logconfess("it seems that you didn't load database!") unless ($self->{'current_mfn'}); |
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|
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if ($self->{'current_mfn'} == -1) { |
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$self->{'current_mfn'} = $self->{'start_mfn'}; |
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} else { |
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$self->{'current_mfn'}++; |
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} |
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|
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my $mfn = $self->{'current_mfn'}; |
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|
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if ($mfn > $self->{'max_mfn'}) { |
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$self->{'current_mfn'} = $self->{'max_mfn'}; |
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$log->debug("at EOF"); |
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return; |
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} |
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|
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$self->progress_bar($mfn,$self->{'max_mfn'}); |
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|
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my $rec; |
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|
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if ($self->{'low_mem'}) { |
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$rec = $self->{'db'}->get($mfn); |
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} else { |
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$rec = $self->{'data'}->{$mfn}; |
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} |
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|
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$rec ||= 0E0; |
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} |
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|
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=head2 pos |
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|
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Returns current record number (MFN). |
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|
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print $isis->pos; |
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|
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First record in database has position 1. |
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|
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=cut |
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|
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sub pos { |
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my $self = shift; |
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return $self->{'current_mfn'}; |
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} |
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|
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|
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=head2 size |
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|
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Returns number of records in database |
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|
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print $isis->size; |
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|
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Result from this function can be used to loop through all records |
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|
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foreach my $mfn ( 1 ... $isis->size ) { ... } |
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|
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because it takes into account C<start_mfn> and C<limit_mfn>. |
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|
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=cut |
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|
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sub size { |
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my $self = shift; |
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return $self->{'size'}; |
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} |
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|
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=head2 seek |
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|
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Seek to specified MFN in file. |
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|
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$isis->seek(42); |
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|
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First record in database has position 1. |
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|
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=cut |
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|
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sub seek { |
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my $self = shift; |
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my $pos = shift || return; |
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|
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my $log = $self->_get_logger(); |
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|
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if ($pos < 1) { |
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$log->warn("seek before first record"); |
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$pos = 1; |
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} elsif ($pos > $self->{'max_mfn'}) { |
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$log->warn("seek beyond last record"); |
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$pos = $self->{'max_mfn'}; |
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} |
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|
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return $self->{'current_mfn'} = (($pos - 1) || -1); |
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} |
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|
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=head1 AUTHOR |
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|
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Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
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|
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=head1 COPYRIGHT & LICENSE |
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|
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Copyright 2005 Dobrica Pavlinusic, All Rights Reserved. |
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|
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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|
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=cut |
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|
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1; # End of WebPAC::Input::ISIS |
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