3 # Copyright (C) 2008 LibLime
5 # This file is part of Koha.
7 # Koha is free software; you can redistribute it and/or modify it
8 # under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3 of the License, or
10 # (at your option) any later version.
12 # Koha is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
40 my $heading = C4::Heading->new_from_bib_field($field, $frameworkcode);
41 my $thesaurus = $heading->thesaurus();
42 my $type = $heading->type();
43 my $display_heading = $heading->display_form();
44 my $search_form = $heading->search_form();
48 C<C4::Heading> implements a simple class to representing
49 headings found in bibliographic and authority records.
53 =head2 new_from_bib_field
55 my $heading = C4::Heading->new_from_bib_field($field, $frameworkcode, [, $marc_flavour]);
57 Given a C<MARC::Field> object containing a heading from a
58 bib record, create a C<C4::Heading> object.
60 The optional second parameter is the MARC flavour (i.e., MARC21
61 or UNIMARC); if this parameter is not supplied, it is
62 taken from the Koha application context.
64 If the MARC field supplied is not a valid heading, undef
69 sub new_from_bib_field {
72 my $frameworkcode = shift;
73 my $marcflavour = @_ ? shift : C4::Context->preference('marcflavour');
75 my $marc_handler = _marc_format_handler($marcflavour);
77 my $tag = $field->tag();
78 return unless $marc_handler->valid_bib_heading_tag( $tag, $frameworkcode );
81 $self->{'field'} = $field;
83 $self->{'auth_type'}, $self->{'thesaurus'},
84 $self->{'search_form'}, $self->{'display_form'},
86 ) = $marc_handler->parse_heading($field);
94 my $auth_type = $heading->auth_type();
96 Return the auth_type of the heading.
102 return $self->{'auth_type'};
107 my $field = $heading->field();
109 Return the MARC::Field the heading is based on.
115 return $self->{'field'};
120 my $display = $heading->display_form();
122 Return the "canonical" display form of the heading.
128 return $self->{'display_form'};
133 my $search_form = $heading->search_form();
135 Return the "canonical" search form of the heading.
141 return $self->{'search_form'};
146 my $authorities = $heading->authorities([$skipmetadata]);
148 Return a list of authority records for this
149 heading. If passed a true value for $skipmetadata,
150 SearchAuthorities will return only authids.
156 my $skipmetadata = shift;
157 my ( $results, $total ) = _search( $self, 'match-heading', $skipmetadata );
161 =head2 preferred_authorities
163 my $preferred_authorities = $heading->preferred_authorities;
165 Return a list of authority records for headings
166 that are a preferred form of the heading.
170 sub preferred_authorities {
172 my $skipmetadata = shift || undef;
173 my ( $results, $total ) = _search( 'see-from', $skipmetadata );
177 =head2 valid_bib_heading_subfield
179 if (C4::Heading::valid_bib_heading_subfield('100', 'e', '')) ...
183 sub valid_bib_heading_subfield {
185 my $subfield = shift;
186 my $marcflavour = @_ ? shift : C4::Context->preference('marcflavour');
188 my $marc_handler = _marc_format_handler($marcflavour);
190 return $marc_handler->valid_bib_heading_subfield( $tag, $subfield );
193 =head1 INTERNAL METHODS
201 my $index = shift || undef;
202 my $skipmetadata = shift || undef;
210 push @marclist, $index;
212 push @operator, $self->{'match_type'};
213 push @value, $self->{'search_form'};
216 # if ($self->{'thesaurus'}) {
217 # push @marclist, 'thesaurus';
218 # push @and_or, 'and';
219 # push @excluding, '';
220 # push @operator, 'is';
221 # push @value, $self->{'thesaurus'};
224 require Koha::SearchEngine::QueryBuilder;
225 require Koha::SearchEngine::Search;
227 # Use state variables to avoid recreating the objects every time.
228 # With Elasticsearch this also avoids creating a massive amount of
229 # ES connectors that would eventually run out of file descriptors.
230 state $builder = Koha::SearchEngine::QueryBuilder->new(
231 { index => $Koha::SearchEngine::AUTHORITIES_INDEX } );
232 state $searcher = Koha::SearchEngine::Search->new(
233 {index => $Koha::SearchEngine::AUTHORITIES_INDEX} );
235 my $search_query = $builder->build_authorities_query_compat(
236 \@marclist, \@and_or, \@excluding, \@operator,
237 \@value, $self->{'auth_type'},
240 return $searcher->search_auth_compat( $search_query, 0, 20, $skipmetadata );
243 =head1 INTERNAL FUNCTIONS
245 =head2 _marc_format_handler
247 Returns a C4::Heading::MARC21 or C4::Heading::UNIMARC object
248 depending on the selected MARC flavour.
252 sub _marc_format_handler {
253 my $marcflavour = uc shift;
254 $marcflavour = 'MARC21' if ( $marcflavour eq 'NORMARC' );
255 my $pname = "C4::Heading::$marcflavour";
257 return $pname->new();
262 Koha Development Team <http://koha-community.org/>
264 Galen Charlton <galen.charlton@liblime.com>