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package WebPAC::Input::DBF; |
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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::Input; |
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use base qw/WebPAC::Common/; |
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use XBase; |
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use Data::Dump qw/dump/; |
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use Encode qw/encode_utf8/; |
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use YAML; |
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use File::Slurp; |
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|
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=head1 NAME |
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|
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WebPAC::Input::DBF - support for reading DBF tables |
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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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=head1 SYNOPSIS |
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|
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Read data from DBF tables (do you remember Clipper applications?) and create |
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pseudo-MARC records from them. |
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|
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my $ll_db = new WebPAC::Input::DBF( |
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path => '/path/to/database.dbf', |
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); |
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|
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=head1 FUNCTIONS |
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|
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=head2 new |
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|
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Returns new low-level input API object |
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|
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my $ll_db = new WebPAC::Input::DBF( |
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path => '/path/to/database.dbf' |
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filter => sub { |
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my ($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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|
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Options: |
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|
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=over 4 |
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|
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=item path |
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|
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path to DBF file |
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|
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=back |
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|
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=cut |
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|
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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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|
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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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my $db = XBase->new( $arg->{path} ) || $log->logdie("can't open ", $arg->{path}, ": $!"); |
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|
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my $size = $db->last_record; |
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|
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$log->info("opening DBF database '$arg->{path}' with $size records"); |
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|
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my $mapping = $arg->{input_config}->{mapping}; |
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|
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if ( ! $mapping ) { |
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$log->debug("didn't found any mapping file in configuration", sub { dump( $arg->{input_config} ) }); |
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|
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foreach my $field ( $db->field_names ) { |
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push @$mapping, { $field => { '900' => 'x' } }; |
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} |
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|
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my $mapping_path = $arg->{path}; |
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$mapping_path =~ s!^.+/([^/]+)\.dbf!$1.yml!; |
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|
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$log->logdie("mapping file $mapping_path allready exists, aborting.") if ( -e $mapping_path ); |
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|
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write_file( $mapping_path, Dump( { mapping => $mapping } ) ) || |
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$log->logdie("can't write template file for mapping_path $mapping_path: $!"); |
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|
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$log->logdie("template file for mapping_path created as $mapping_path"); |
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|
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} else { |
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$log->debug("using mapping ", sub { dump($mapping) }); |
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} |
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|
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foreach my $mfn ( 1 .. $size ) { |
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|
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my $row = $db->get_record_as_hash( $mfn ); |
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|
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$log->debug("dbf row = ", sub { dump( $row ) }); |
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|
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my $record = { |
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'001' => [ $mfn ], |
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}; |
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|
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$self->{_rows}->{ $mfn } = $record; |
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$log->debug("created row $mfn ", dump( $record )); |
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} |
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|
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$self->{size} = $size; |
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|
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$self ? return $self : return undef; |
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} |
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|
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=head2 fetch_rec |
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|
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Return record with ID C<$mfn> from database |
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|
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my $rec = $ll_db->fetch_rec( $mfn, $filter_coderef ); |
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|
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=cut |
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|
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sub fetch_rec { |
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my $self = shift; |
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|
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my ($mfn, $filter_coderef) = @_; |
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|
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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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|
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my $log = $self->_get_logger(); |
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$log->debug("fetch_rec($mfn) = ", dump($rec)); |
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|
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return $rec; |
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} |
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|
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=head2 size |
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|
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Return number of records in database |
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|
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my $size = $ll_db->size; |
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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 _to_hash |
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|
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Return hash from row. Taken from L<Biblio::Isis> |
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|
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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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|
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=cut |
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|
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sub _to_hash { |
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my $self = shift; |
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|
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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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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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|
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# init record to include MFN as field 000 |
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my $rec = { '000' => [ $mfn ] }; |
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|
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foreach my $f_nr (keys %{$row}) { |
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foreach my $l (@{$row->{$f_nr}}) { |
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|
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# filter output |
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$l = $hash_filter->($l, $f_nr) if ($hash_filter); |
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next unless defined($l); |
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|
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my $val; |
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my $r_sf; # repeatable subfields in this record |
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|
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# has subfields? |
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if ($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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|
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if (ref( $val->{$sf} ) eq 'ARRAY') { |
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|
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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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|
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} elsif (defined( $val->{$sf} )) { |
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|
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# convert scalar field to array |
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$val->{$sf} = [ $val->{$sf}, $v ]; |
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|
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push @{ $val->{subfields} }, ( $sf, 1 ); |
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$r_sf->{$sf}++; |
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|
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} else { |
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$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 = $l; |
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} |
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|
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push @{$rec->{$f_nr}}, $val; |
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} |
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} |
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|
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return $rec; |
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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 2007 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::DBF |
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