C4/Heading.pm

   1 package C4::Heading;
   2
   3 # Copyright (C) 2008 LibLime
   4 #
   5 # This file is part of Koha.
   6 #
   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.
  11 #
  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.
  16 #
  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>.
  19
  20 use strict;
  21 use warnings;
  22 use MARC::Record;
  23 use MARC::Field;
  24 use C4::Context;
  25 use Module::Load;
  26 use Carp;
  27
  28
  29 =head1 NAME
  30
  31 C4::Heading
  32
  33 =head1 SYNOPSIS
  34
  35  use C4::Heading;
  36  my $heading = C4::Heading->new_from_bib_field($field, $frameworkcode);
  37  my $thesaurus = $heading->thesaurus();
  38  my $type = $heading->type();
  39  my $display_heading = $heading->display_form();
  40  my $search_form = $heading->search_form();
  41
  42 =head1 DESCRIPTION
  43
  44 C<C4::Heading> implements a simple class to representing
  45 headings found in bibliographic and authority records.
  46
  47 =head1 METHODS
  48
  49 =head2 new_from_bib_field
  50
  51   my $heading = C4::Heading->new_from_bib_field($field, $frameworkcode, [, $marc_flavour]);
  52
  53 Given a C<MARC::Field> object containing a heading from a
  54 bib record, create a C<C4::Heading> object.
  55
  56 The optional second parameter is the MARC flavour (i.e., MARC21
  57 or UNIMARC); if this parameter is not supplied, it is
  58 taken from the Koha application context.
  59
  60 If the MARC field supplied is not a valid heading, undef
  61 is returned.
  62
  63 =cut
  64
  65 sub new_from_bib_field {
  66     my $class         = shift;
  67     my $field         = shift;
  68     my $frameworkcode = shift;
  69     my $marcflavour   = @_ ? shift : C4::Context->preference('marcflavour');
  70
  71     my $marc_handler = _marc_format_handler($marcflavour);
  72
  73     my $tag = $field->tag();
  74     return unless $marc_handler->valid_bib_heading_tag( $tag, $frameworkcode );
  75     my $self = {};
  76
  77     $self->{'field'} = $field;
  78     (
  79         $self->{'auth_type'},   $self->{'thesaurus'},
  80         $self->{'search_form'}, $self->{'display_form'},
  81         $self->{'match_type'}
  82     ) = $marc_handler->parse_heading($field);
  83
  84     bless $self, $class;
  85     return $self;
  86 }
  87
  88 =head2 auth_type
  89
  90   my $auth_type = $heading->auth_type();
  91
  92 Return the auth_type of the heading.
  93
  94 =cut
  95
  96 sub auth_type {
  97     my $self = shift;
  98     return $self->{'auth_type'};
  99 }
 100
 101 =head2 field
 102
 103   my $field = $heading->field();
 104
 105 Return the MARC::Field the heading is based on.
 106
 107 =cut
 108
 109 sub field {
 110     my $self = shift;
 111     return $self->{'field'};
 112 }
 113
 114 =head2 display_form
 115
 116   my $display = $heading->display_form();
 117
 118 Return the "canonical" display form of the heading.
 119
 120 =cut
 121
 122 sub display_form {
 123     my $self = shift;
 124     return $self->{'display_form'};
 125 }
 126
 127 =head2 search_form
 128
 129   my $search_form = $heading->search_form();
 130
 131 Return the "canonical" search form of the heading.
 132
 133 =cut
 134
 135 sub search_form {
 136     my $self = shift;
 137     return $self->{'search_form'};
 138 }
 139
 140 =head2 authorities
 141
 142   my $authorities = $heading->authorities([$skipmetadata]);
 143
 144 Return a list of authority records for this
 145 heading. If passed a true value for $skipmetadata,
 146 SearchAuthorities will return only authids.
 147
 148 =cut
 149
 150 sub authorities {
 151     my $self         = shift;
 152     my $skipmetadata = shift;
 153     my ( $results, $total ) = _search( $self, 'match-heading', $skipmetadata );
 154     return $results;
 155 }
 156
 157 =head2 preferred_authorities
 158
 159   my $preferred_authorities = $heading->preferred_authorities;
 160
 161 Return a list of authority records for headings
 162 that are a preferred form of the heading.
 163
 164 =cut
 165
 166 sub preferred_authorities {
 167     my $self = shift;
 168     my $skipmetadata = shift || undef;
 169     my ( $results, $total ) = _search( 'see-from', $skipmetadata );
 170     return $results;
 171 }
 172
 173 =head1 INTERNAL METHODS
 174
 175 =head2 _search
 176
 177 =cut
 178
 179 sub _search {
 180     my $self         = shift;
 181     my $index        = shift || undef;
 182     my $skipmetadata = shift || undef;
 183     my @marclist;
 184     my @and_or;
 185     my @excluding = [];
 186     my @operator;
 187     my @value;
 188
 189     if ($index) {
 190         push @marclist, $index;
 191         push @and_or,   'and';
 192         push @operator, $self->{'match_type'};
 193         push @value,    $self->{'search_form'};
 194     }
 195
 196     #    if ($self->{'thesaurus'}) {
 197     #        push @marclist, 'thesaurus';
 198     #        push @and_or, 'and';
 199     #        push @excluding, '';
 200     #        push @operator, 'is';
 201     #        push @value, $self->{'thesaurus'};
 202     #    }
 203     require C4::AuthoritiesMarc;
 204     return C4::AuthoritiesMarc::SearchAuthorities(
 205         \@marclist, \@and_or, \@excluding, \@operator,
 206         \@value,    0,        20,          $self->{'auth_type'},
 207         'AuthidAsc',         $skipmetadata
 208     );
 209 }
 210
 211 =head1 INTERNAL FUNCTIONS
 212
 213 =head2 _marc_format_handler
 214
 215 Returns a C4::Heading::MARC21 or C4::Heading::UNIMARC object
 216 depending on the selected MARC flavour.
 217
 218 =cut
 219
 220 sub _marc_format_handler {
 221     my $marcflavour = uc shift;
 222     $marcflavour = 'MARC21' if ( $marcflavour eq 'NORMARC' );
 223     my $pname = "C4::Heading::$marcflavour";
 224     load $pname;
 225     return $pname->new();
 226 }
 227
 228 =head1 AUTHOR
 229
 230 Koha Development Team <http://koha-community.org/>
 231
 232 Galen Charlton <galen.charlton@liblime.com>
 233
 234 =cut
 235
 236 1;