1 package Equinox::Migration::SubfieldMapper;
8 Equinox::Migration::SubfieldMapper - Generate named-field to MARC tag map from file
16 our $VERSION = '1.001';
21 Using a file as input, E::M::SM generates a mapping of MARC subfields
22 to arbitrary field names, and provides several access mechanisms to
25 use Equinox::Migration::SubfieldMapper;
27 my $stl = Equinox::Migration::SubfieldMapper->new( file => ".txt" );
28 my $tags = $stl->as_hashref;
32 my $stl = Equinox::Migration::SubfieldMapper->new( file => ".txt" );
33 if ( $stl->has($foo) ) {
34 # if $foo is an element of $stl's parsed list
43 Takes one optional argument, C<file>. If this is speficied, the tag
44 list will be populated as per that file on instantiation.
46 Returns a E::M::STL object.
51 my ($class, %args) = @_;
53 my $self = bless { conf => { mods => undef },
58 die "Argument 'mods' is wrong type\n"
59 unless (ref $args{mods} eq "ARRAY");
60 for my $mod ( @{$args{mods}} )
61 { $self->{conf}{mods}{$mod} = 1 }
66 $self->{conf}{file} = $args{file};
69 die "Can't open file: $!\n";
78 Ask it whether your mapping has various things, and it'll let you know.
80 $sm->has('fieldname') # is this fieldname mapped?
81 $sm->has(901) # are there any mappings for this tag?
82 $sm->has(650,'c') # is this tag/subfield combo mapped?
83 $sm->has('name', 245, 'a') # is this name mapped to 245$a?
85 Returns 1 if true, 0 if false.
87 FIXME: use named params instead of positional
92 my ($self, @chunks) = @_;
93 return undef unless (defined $chunks[0]);
95 if ($chunks[0] =~ /^\d/) {
96 if (defined $chunks[1]) {
97 return 1 if ( defined $self->{tags}{$chunks[0]}{$chunks[1]} );
100 return 1 if ( defined $self->{tags}{$chunks[0]} );
104 if (defined $chunks[2]) {
105 return 1 if ( $self->{fields}{$chunks[0]}{tag} eq $chunks[1] and
106 $self->{fields}{$chunks[0]}{sub} eq $chunks[2] );
108 } elsif (defined $chunks[1]) {
109 return 1 if ( $self->{fields}{$chunks[0]}{tag} eq $chunks[1] );
112 return 1 if ( defined $self->{fields}{$chunks[0]} );
120 Returns an arrayref containing the tags defined in the map.
122 my $tags = $sfm->tags;
123 for my tag ( @{$tags} ) {
124 my $subs = $sfm->subfields($tag);
132 return [ keys %{$self->{tags}} ];
137 Given a tag, return an arrayref of the subfields mapped with that tag.
139 my $tags = $sfm->tags;
140 for my tag ( @{$tags} ) {
141 my $subs = $sfm->subfields($tag);
145 Returns C<undef> if C<tag> is not mapped.
150 my ($self, $tag) = @_;
151 return undef unless $self->has($tag);
152 return [ keys %{$self->{tags}{$tag}} ];
158 Given a tag and subfield code,
160 my $fname = $sm->field(945, 'p')
162 return the name mapped to them. Returns C<undef> if no mapping exists.
167 my ($self, $tag, $sub) = @_;
168 return undef unless (defined $tag and defined $sub);
169 return undef unless $self->has($tag, $sub);
170 return $self->{tags}{$tag}{$sub};
175 Returns the modifiers set on a mapping.
177 $self->mods('fieldname')
179 If there are no modifiers, C<undef> will be returned. Else a listref
185 my ($self, $field) = @_;
186 return undef unless $self->has($field);
187 return $self->{fields}{$field}{mods};
192 Returns the content filters set on a mapping
194 $self->filters('fieldname')
196 If there are no filters, C<undef> will be returned. Else a listref
202 my ($self, $field) = @_;
203 return undef unless $self->has($field);
204 return $self->{fields}{$field}{filt};
207 =head1 MAP CONSTRUCTION METHODS
209 These methods are not generally accessed from user code.
213 Generate initial mapping from file.
218 my ($self, $file) = @_;
220 open TAGFILE, '<', $self->{conf}{file};
226 my @tokens = split /\s+/;
228 my $map = { mods => [], filt => [] };
229 $map->{field} = shift @tokens;
230 $map->{tag} = shift @tokens;
231 while (my $tok = shift @tokens) {
232 last if ($tok =~ m/^#/);
233 if ($tok =~ m/^[a-z]:'/) {
234 $tok .= ' ' . shift @tokens
235 until ($tokens[0] =~ m/'$/);
236 $tok .= ' ' . shift @tokens;
241 { push @{$map->{mods}}, $tok }
242 elsif ($tok =~ m/^f:/)
243 { push @{$map->{filt}}, $tok }
244 elsif ($tok =~ m/^[a-z0-9]$/)
245 { $map->{sub} = $tok }
247 { die "Unknown chunk '$tok' at line $.\n" }
255 Add new item to mapping. Not usually called directly from user code.
259 Where C<$map> is a hashref that, at a minimum, looks like
261 { field => "value", tag => NNN, sub => X }
263 and may also have the key/value pairs
271 my ($self, $map) = @_;
273 # trim the mods and filters
274 my $mods = []; my %mods = ();
275 my $filt = []; my %filt = ();
276 for my $m (@{$map->{mods}}) {
277 die "Modifier collision '$m' at line $." if $mods{$m};
279 push @{$mods}, $m; $mods{$m} = 1;
281 for my $f (@{$map->{filt}}) {
282 die "Modifier collision '$f' at line $." if $filt{$f};
284 push @{$filt}, $f; $filt{$f} = 1;
286 $map->{mods} = $mods;
287 $map->{filt} = $filt;
289 # check bits for validity
290 $self->validate($map);
292 # add data to the fields hash
293 $self->{fields}{ $map->{field} } = { tag => $map->{tag},
295 mods => $map->{mods},
298 # and to the tags hash
299 $self->{tags}{ $map->{tag} }{ $map->{sub} } = $map->{field};
304 Passed a reference to the hash given to C<add>, validate scans its
305 contents for common errors and dies if there is an issue.
307 * field, tag, and sub are required
308 * fieldnames must start with a letter
309 * fieldnames must be unique
310 * tag must be between 0 and 999
311 * subfield code must be a single alphanumeric character
312 * tag+subfield can only be mapped once
313 * if a list of allowable mod values was given in the call to
314 C<new>, any modifiers must be on that list
319 my ($self, $map) = @_;
321 $.= 1 unless defined $.;
323 die "Required field missing (line $.)\n"
324 unless (defined $map->{field} and defined $map->{tag} and defined $map->{sub});
326 die "Fieldnames must start with letter (line $.)\n"
327 unless ($map->{field} =~ /^[a-zA-z]/);
329 die "Invalid tag (line $.)\n"
330 if ($map->{tag} =~ /[^\d\-]/ or $map->{tag} < 0 or $map->{tag} > 999);
332 die "Invalid subfield code (line $.)\n"
333 if (length $map->{sub} != 1 or $map->{sub} =~ /[^a-zA-Z0-9]/);
335 # test mod names if we have a set to check against
336 if (defined $self->{conf}{mods}) {
337 for my $mod ( @{$map->{mods}} ) {
338 die "Modifier '$mod' not allowed\n"
339 unless $self->{conf}{mods}{$mod};
343 die "Fieldnames must be unique (line $.)\n"
344 if (defined $self->{fields}{$map->{field}});
346 die "Subfields cannot be mapped twice (line $.)\n"
347 if (defined $self->{tags}{$map->{tag}}{$map->{sub}});
354 Shawn Boyette, C<< <sboyette at esilibrary.com> >>
358 Please report any bugs or feature requests to the above email address.
362 You can find documentation for this module with the perldoc command.
364 perldoc Equinox::Migration::SubfieldMapper
367 =head1 COPYRIGHT & LICENSE
369 Copyright 2009 Equinox, all rights reserved.
371 This program is free software; you can redistribute it and/or modify it
372 under the same terms as Perl itself.
377 1; # End of Equinox::Migration::SimpleTagList