-package Equinox::Migration::MapDrivenXMLProc;
+package Equinox::Migration::MapDrivenMARCXMLProc;
use warnings;
use strict;
use XML::Twig;
-use Equinox::Migration::SubfieldMapper;
+use Equinox::Migration::SubfieldMapper 1.003;
+
+# FIXME
+#
+# sample functionality should be extracted into a new module which
+# uses E::M::SM to drive sampling of individual datafields, and
+# reports ALL datafields which occur
+#
+# --sample should give the list of all datafields
+# --samplefile should take a SM map as teh argument and introspect the mapped datafields
+
=head1 NAME
-Equinox::Migration::MapDrivenXMLProc
+Equinox::Migration::MapDrivenMARCXMLProc
=head1 VERSION
Foo
- use Equinox::Migration::MapDrivenXMLProc;
-
-
-=cut
-
+ use Equinox::Migration::MapDrivenMARCXMLProc;
=head1 METHODS
=head2 new
+Takes two required arguments: C<mapfile> (which will be passed along
+to L<Equinox::Migration::SubfieldMapper> as the basis for its map),
+and C<marcfile> (the MARC data to be processed).
+
+ my $m = Equinox::Migration::MapDrivenMARCXMLProc->new( mapfile => FILE,
+ marcfile => FILE );
+
=cut
sub new {
my ($class, %args) = @_;
- my $self = bless { conf => { count => 0,
- total => 0,
- quiet => 0,
+ my $self = bless { mods => { multi => {},
+ bib => {},
+ required => {},
+ },
+ data => { recs => undef, # X::T record objects
+ rptr => 0, # next record pointer
+ crec => undef, # parsed record storage
},
- map => Equinox::Migration::SubfieldMapper->new(file => $args{mapfile}),
- tags => {},
- twig => XML::Twig->new( twig_handlers => { record => \&record } ),
}, $class;
- if ($args{marcfile}) {
- if (-r $args{marcfile}) {
- $self->{conf}{marc} = $args{marcfile};
- $self->generate;
- } else {
- die "Can't open marc file: $!\n";
- }
+ # initialize map and taglist
+ die "Argument 'mapfile' must be specified\n" unless (defined $args{mapfile});
+ my @mods = keys %{$self->{mods}};
+ $self->{map} = Equinox::Migration::SubfieldMapper->new( file => $args{mapfile},
+ mods => \@mods );
+ $self->{data}{tags} = $self->{map}->tags;
+
+ # initialize twig
+ die "Argument 'marcfile' must be specified\n" unless (defined $args{marcfile});
+ if (-r $args{marcfile}) {
+ $self->{twig} = XML::Twig->new;
+ $self->{twig}->parsefile($args{marcfile});
+ my @records = $self->{twig}->root->children;
+ $self->{data}{recs} = \@records;
+ } else {
+ die "Can't open marc file: $!\n";
}
- $self->{twig}->parsefile($self->{conf}{marc});
-
return $self;
}
-sub parse {
- my ($self) = @_;
-}
+=head2 parse_record
-sub emit_status {
- my ($self) = @_;
- my $c = $self->{conf};
- return if $c->{quiet};
- $c->{count}++;
- my $percent = int(($c->{count} / $c->{total}) * 100);
- print STDERR "\r$percent% done (", $c->{count}, ")";
-}
+Extracts data from the next record, per the mapping file. Returns a
+normalized datastructure (see L</format_record> for details) on
+success; returns 0 otherwise.
+ while (my $rec = $m->parse_record) {
+ # handle extracted record data
+ }
-=head2 XML::Twig CALLBACK ROUTINES
+=cut
-=head3 record
+sub parse_record {
+ my ($self) = @_;
-=cut
+ # get the next record and wipe current parsed record
+ return 0 unless defined $self->{data}{recs}[ $self->{data}{rptr} ];
+ my $record = $self->{data}{recs}[ $self->{data}{rptr} ];
+ $self->{data}{crec} = { egid => undef, bib => undef, tags => undef };
-sub record {
- my($t, $r)= @_;
- $self->{holdings} = {};
+ my @fields = $record->children;
+ for my $f (@fields)
+ { $self->process_field($f) }
- my @dfields = $r->children('datafield');
- for my $d (@dfields) {
- process_datafields($d);
- }
- write_data_out();
- $r->purge;
-}
+ # cleanup memory and increment pointer
+ $record->purge;
+ $self->{data}{rptr}++;
-=head3 process_datafields
+ # check for required fields
+ $self->check_required;
-=cut
+ return $self->{data}{crec};
+}
-sub process_datafields {
- my ($d) = @_;
+sub process_field {
+ my ($self, $field) = @_;
my $map = $self->{map};
- my $tag = $d->{'att'}->{'tag'};
+ my $tag = $field->{'att'}->{'tag'};
+ my $crec = $self->{data}{crec};
+ # leader
+ unless (defined $tag) {
+ #FIXME
+ return;
+ }
+
+ # datafields
if ($tag == 903) {
- my $s = $d->first_child('subfield');
- $self->{holdings}{id} = $s->text;;
- } elsif ($map->has($tag)) {
- push @{$self->{holdings}{copies}}, { tag => $tag };
- my @subs = $d->children('subfield');
+ my $sub = $field->first_child('subfield');
+ $crec->{egid} = $sub->text;
+ return;
+ }
+ if ($map->has($tag)) {
+ push @{$crec->{tags}}, { tag => $tag, uni => undef, multi => undef };
+ my @subs = $field->children('subfield');
for my $sub (@subs)
- { process_subs($tag, $sub) }
+ { $self->process_subs($tag, $sub) }
+ # check map to ensure all declared subs have a value
+ my $mods = $map->mods($field);
+ for my $mappedsub ( @{ $map->subfields($tag) } ) {
+ next if $mods->{multi};
+ $crec->{tags}[-1]{uni}{$mappedsub} = ''
+ unless defined $crec->{tags}[-1]{uni}{$mappedsub};
+ }
}
}
-=head3 process_subs
-
-=cut
-
sub process_subs {
- my ($tag, $sub) = @_;
+ my ($self, $tag, $sub) = @_;
my $map = $self->{map};
my $code = $sub->{'att'}->{'code'};
- unless ($map->has($tag, $code)) {
- # this is a subfield code we don't have mapped. report on it if this is a sample tag
- push @{$c->{sample}{$tag}}, $code if defined $c->{sample}{tag};
- return;
- }
+ # handle unmapped tag/subs
+ return unless ($map->has($tag, $code));
- my $copy = $self->{holdings}{copies}[-1];
+ # fetch our datafield struct and fieldname
+ my $dataf = $self->{data}{crec}{tags}[-1];
my $field = $map->field($tag, $code);
- if ($map->mod($field) eq 'multi') {
- my $name = $tag . $code;
- push @{$copy->{multi}{$name}}, $sub->text;
- } else {
- $copy->{uni}{$code} = $sub->text;
+
+ # handle modifiers
+ if (my $mods = $map->mods($field)) {
+ if ($mods->{multi}) {
+ my $name = $tag . $code;
+ push @{$dataf->{multi}{$name}}, $sub->text;
+ return;
+ }
}
+
+ die "Multiple occurances of a non-multi field: $tag$code at rec ",
+ ($self->{data}{rptr} + 1),"\n" if (defined $dataf->{uni}{$code});
+ $dataf->{uni}{$code} = $sub->text;
}
+
+sub check_required {
+ my ($self) = @_;
+ my $mods = $self->{map}->mods;
+ my $crec = $self->{data}{crec};
+
+ for my $tag_id (keys %{$mods->{required}}) {
+ for my $code (@{$mods->{required}{$tag_id}}) {
+ my $found = 0;
+
+ $found = 1 if ($crec->{bib}{($tag_id . $code)});
+ for my $tag (@{$crec->{tags}}) {
+ $found = 1 if ($tag->{multi}{($tag_id . $code)});
+ $found = 1 if ($tag->{uni}{$code});
+ }
+
+ die "Required mapping $tag_id$code not found in rec ",$self->{data}{rptr},"\n"
+ unless ($found);
+ }
+ }
+
+}
+
+=head1 MODIFIERS
+
+MapDrivenMARCXMLProc implements the following modifiers, and passes
+them to L<Equinox::Migration::SubfieldMapper>, meaning that specifying
+any other modifiers in a MDMP map file will cause a fatal error when
+it is processed.
+
+=head2 multi
+
+If a mapping is declared to be C<multi>, then MDMP expects to see more
+than one instance of that subfield per datafield, and the data is
+handled accordingly (see L</PARSED RECORDS> below).
+
+Occurring zero or one time is legal for a C<multi> mapping.
+
+A mapping which is not flagged as C<multi>, but which occurs more than
+once per datafield will cause a fatal error.
+
+=head2 bib
+
+The C<bib> modifier declares that a mapping is "bib-level", and should
+be encountered once per B<record> instead of once per B<datafield> --
+which is another way of saying that it occurs in a non-repeating
+datafield or in a controlfield.
+
+=head2 required
+
+By default, if a mapping does not occur in a datafield (or record, in
+the case of C<bib> mappings), processing continues normally. if a
+mapping has the C<required> modifier, however, it must appear, or a
+fatal error will occur.
+
+=head1 PARSED RECORDS
+
+Given:
+
+ my $m = Equinox::Migration::MapDrivenMARCXMLProc->new(ARGUMENTS);
+ $rec = $m->parse_record;
+
+Then C<$rec> will look like:
+
+ {
+ egid => evergreen_record_id,
+ bib => {
+ (tag_id . sub_code)1 => value1,
+ (tag_id . sub_code)2 => value2,
+ ...
+ },
+ tags => [
+ {
+ tag => tag_id,
+ multi => { (tag_id . sub_code) => [ val1, val2, ... ] },
+ uni => { code => value, code2 => value2, ... },
+ },
+ ...
+ ]
+ }
+
+That is, there is an C<egid> key which points to the Evergreen ID of
+that record, a C<bib> key which points to a hashref, and a C<tags>
+key which points to an arrayref.
+
+=head3 C<bib>
+
+A reference to a hash which holds extracted data which occurs only
+once per record (and is therefore "bib-level"; the default assumption
+is that a tag/subfield pair can occur multiple times per record). The
+keys are composed of tag id and subfield code, catenated
+(e.g. 901c). The values are the contents of that subfield of that tag.
+
+If there are no tags defined as bib-level in the mapfile, C<bib> will
+be C<undef>.
+
+=head3 C<tags>
+
+A reference to a list of anonymous hashes, one for each instance of
+each tag which occurs in the map.
+
+Each tag hash holds its own id (e.g. C<998>), and two references to
+two more hashrefs, C<multi> and C<uni>.
+
+The C<multi> hash holds the extracted data for tag/sub mappings which
+have the C<multiple> modifier on them. The keys in C<multi> are
+composed of the tag id and subfield code, catenated
+(e.g. C<901c>). The values are arrayrefs containing the content of all
+instances of that subfield in that instance of that tag. If no tags
+are defined as C<multi>, it will be C<undef>.
+
+The C<uni> hash holds data for tag/sub mappings which occur only once
+per instance of a tag (but may occur multiple times in a record due to
+there being multiple instances of that tag in a record). Keys are
+subfield codes and values are subfield content.
+
+All C<uni> subfields occuring in the map are guaranteed to be
+defined. Sufields which are mapped but do not occur in a particular
+datafield will be given a value of '' (the null string) in the current
+record struct. Oppose subfields which are not mapped, which will be
+C<undef>.
+
+
=head1 AUTHOR
Shawn Boyette, C<< <sboyette at esilibrary.com> >>
You can find documentation for this module with the perldoc command.
- perldoc Equinox::Migration::MapDrivenXMLProc
+ perldoc Equinox::Migration::MapDrivenMARCXMLProc
=head1 COPYRIGHT & LICENSE
=cut
-1; # End of Equinox::Migration::MapDrivenXMLProc
+1; # End of Equinox::Migration::MapDrivenMARCXMLProc