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dpavlin |
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package WebPAC::Input::Gutenberg; |
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use warnings; |
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use strict; |
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use WebPAC::Input; |
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use base qw/WebPAC::Common/; |
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use XML::LibXML; |
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use Data::Dump qw/dump/; |
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use Encode qw/encode_utf8/; |
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=head1 NAME |
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WebPAC::Input::Gutenberg - support for RDF catalog data from Project Gutenberg |
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=head1 VERSION |
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Version 0.01 |
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=cut |
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our $VERSION = '0.01'; |
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=head1 SYNOPSIS |
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Read catalog data from Project Gutemberg (uncompressed!) and create |
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pseudo-MARC records from them. |
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my $ll_db = new WebPAC::Input::Gutenberg( |
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path => '/path/to/catalog.rdf', |
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); |
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=head1 FUNCTIONS |
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=head2 new |
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Returns new low-level input API object |
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my $ll_db = new WebPAC::Input::Gutenberg( |
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path => '/path/to/catalog.rdf' |
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filter => sub { |
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my ($l,$field_nr) = @_; |
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# do something with $l which is line of input file |
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return $l; |
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}, |
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} |
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Options: |
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=over 4 |
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=item path |
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path to Project Gutenberg RDF catalog file |
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=back |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = {@_}; |
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bless($self, $class); |
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my $arg = {@_}; |
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my $log = $self->_get_logger(); |
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$log->info("opening Project Gutenberg RDF catalog '$arg->{path}'"); |
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my $parser = XML::LibXML->new (); |
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$parser->keep_blanks (0); |
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my $doc = $parser->parse_file( $arg->{path} ); |
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$log->info("parsing over, finding book nodes"); |
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my $booknodes = $doc->findnodes ('/rdf:RDF/pgterms:etext'); |
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$log->logdie("can't find any book nodes in RDF '$arg->{path}'") unless ($booknodes->size > 0); |
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my $mapping = [ |
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[ 'dc:title//text()', '200', 'a' ], |
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[ 'dc:creator//text()', '700', 'a' ], |
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[ 'dc:alternative//text()', '740', 'a' ], |
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[ 'dc:subject//text()', '650', 'a' ], |
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[ 'dc:contributor//text()', '700', 'a' ], |
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[ 'dc:created//text()', '533', 'd' ], |
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[ 'dc:description//text()', '500', 'a' ], |
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[ 'dc:language//text()', '041', 'a' ], |
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]; |
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$log->info("found ", $booknodes->size, " book nodes, processing"); |
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my $mfn = 1; |
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foreach my $booknode (@$booknodes) { |
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# this is a book description node |
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my $etext_no = $booknode->getAttribute ('ID'); |
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$etext_no =~ s/^etext//; |
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my $row = { |
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'001' => [ $etext_no ], |
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}; |
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foreach my $m ( @$mapping ) { |
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my ($xpath,$f,$sf) = @$m; |
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foreach my $v ($booknode->findnodes($xpath)) { |
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push @{ $row->{$f} }, '^' . $sf . encode_utf8( $v->textContent ); |
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} |
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dpavlin |
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$log->debug("using $xpath to fill $f^$sf ==> ", dump( $row->{$f} )) if (defined( $row->{$f} )); |
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dpavlin |
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} |
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$self->{_rows}->{ $mfn } = $row; |
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$log->debug("created row $mfn ", dump( $row )); |
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$mfn++; |
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} |
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$booknodes = undef; # release some memory |
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$self->{size} = $mfn - 1; |
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$log->info("created ", $self->{size}, " records for ", $arg->{path}); |
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$self ? return $self : return undef; |
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} |
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=head2 fetch_rec |
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Return record with ID C<$mfn> from database |
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my $rec = $ll_db->fetch_rec( $mfn, $filter_coderef ); |
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=cut |
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sub fetch_rec { |
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my $self = shift; |
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my ($mfn, $filter_coderef) = @_; |
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my $rec = $self->_to_hash( |
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mfn => $mfn, |
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row => $self->{_rows}->{$mfn}, |
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hash_filter => $filter_coderef, |
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); |
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my $log = $self->_get_logger(); |
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$log->debug("fetch_rec($mfn) = ", dump($rec)); |
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return $rec; |
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} |
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=head2 size |
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Return number of records in database |
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my $size = $ll_db->size; |
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=cut |
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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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=head2 _to_hash |
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Return hash from row. Taken from L<Biblio::Isis> |
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my $rec = $ll_db->_to_hash( |
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mfn => $mfn; |
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$row |
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); |
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=cut |
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sub _to_hash { |
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my $self = shift; |
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my $arg = {@_}; |
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my $log = $self->_get_logger(); |
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my $hash_filter = $arg->{hash_filter}; |
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my $mfn = $arg->{mfn} || $log->logconfess("need mfn in arguments"); |
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my $row = $arg->{row} || $log->logconfess("need row in arguments"); |
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# init record to include MFN as field 000 |
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my $rec = { '000' => [ $mfn ] }; |
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foreach my $f_nr (keys %{$row}) { |
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foreach my $l (@{$row->{$f_nr}}) { |
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# filter output |
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$l = $hash_filter->($l, $f_nr) if ($hash_filter); |
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next unless defined($l); |
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my $val; |
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my $r_sf; # repeatable subfields in this record |
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# has subfields? |
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if ($l =~ m/\^/) { |
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foreach my $t (split(/\^/,$l)) { |
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next if (! $t); |
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my ($sf,$v) = (substr($t,0,1), substr($t,1)); |
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next unless (defined($v) && $v ne ''); |
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if (ref( $val->{$sf} ) eq 'ARRAY') { |
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push @{ $val->{$sf} }, $v; |
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# record repeatable subfield it it's offset |
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push @{ $val->{subfields} }, ( $sf, $#{ $val->{$sf} } ); |
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$r_sf->{$sf}++; |
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} elsif (defined( $val->{$sf} )) { |
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# convert scalar field to array |
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$val->{$sf} = [ $val->{$sf}, $v ]; |
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push @{ $val->{subfields} }, ( $sf, 1 ); |
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$r_sf->{$sf}++; |
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} else { |
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$val->{$sf} = $v; |
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push @{ $val->{subfields} }, ( $sf, 0 ); |
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} |
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} |
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} else { |
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$val = $l; |
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} |
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push @{$rec->{$f_nr}}, $val; |
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} |
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} |
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return $rec; |
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} |
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=head1 AUTHOR |
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Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
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=head1 COPYRIGHT & LICENSE |
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Copyright 2006 Dobrica Pavlinusic, All Rights Reserved. |
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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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=cut |
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1; # End of WebPAC::Input::Gutenberg |
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