C4/Linker/Default.pm

   1 package C4::Linker::Default;
   2
   3 # Copyright 2011 C & P Bibliography Services
   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 Carp;
  23 use MARC::Field;
  24 use C4::Heading;
  25
  26 use base qw(C4::Linker);
  27
  28 sub get_link {
  29     my $self        = shift;
  30     my $heading     = shift;
  31     my $behavior    = shift || 'default';
  32     my $search_form = $heading->search_form();
  33     my $authid;
  34     my $fuzzy = 0;
  35
  36     if ( $self->{'cache'}->{$search_form}->{'cached'} ) {
  37         $authid = $self->{'cache'}->{$search_form}->{'authid'};
  38         $fuzzy  = $self->{'cache'}->{$search_form}->{'fuzzy'};
  39     }
  40     else {
  41
  42         # look for matching authorities
  43         my $authorities = $heading->authorities(1);    # $skipmetadata = true
  44
  45         if ( $behavior eq 'default' && $#{$authorities} == 0 ) {
  46             $authid = $authorities->[0]->{'authid'};
  47         }
  48         elsif ( $behavior eq 'first' && $#{$authorities} >= 0 ) {
  49             $authid = $authorities->[0]->{'authid'};
  50             $fuzzy  = $#{$authorities} > 0;
  51         }
  52         elsif ( $behavior eq 'last' && $#{$authorities} >= 0 ) {
  53             $authid = $authorities->[ $#{$authorities} ]->{'authid'};
  54             $fuzzy  = $#{$authorities} > 0;
  55         }
  56
  57         if ( !defined $authid && $self->{'broader_headings'} ) {
  58             my $field     = $heading->field();
  59             my @subfields = grep { $_->[0] ne '9' } $field->subfields();
  60             if ( scalar @subfields > 1 ) {
  61                 pop @subfields;
  62                 $field =
  63                     MARC::Field->new(
  64                         $field->tag,
  65                         $field->indicator(1),
  66                         $field->indicator(2),
  67                         map { $_->[0] => $_->[1] } @subfields
  68                     );
  69                 ( $authid, $fuzzy ) =
  70                   $self->get_link( C4::Heading->new_from_bib_field($field),
  71                     $behavior );
  72             }
  73         }
  74
  75         $self->{'cache'}->{$search_form}->{'cached'} = 1;
  76         $self->{'cache'}->{$search_form}->{'authid'} = $authid;
  77         $self->{'cache'}->{$search_form}->{'fuzzy'}  = $fuzzy;
  78     }
  79     return $self->SUPER::_handle_auth_limit($authid), $fuzzy;
  80 }
  81
  82 sub update_cache {
  83     my $self        = shift;
  84     my $heading     = shift;
  85     my $authid      = shift;
  86     my $search_form = $heading->search_form();
  87     my $fuzzy = 0;
  88
  89     $self->{'cache'}->{$search_form}->{'cached'} = 1;
  90     $self->{'cache'}->{$search_form}->{'authid'} = $authid;
  91     $self->{'cache'}->{$search_form}->{'fuzzy'}  = $fuzzy;
  92 }
  93
  94 sub flip_heading {
  95     my $self    = shift;
  96     my $heading = shift;
  97
  98     # TODO: implement
  99 }
 100
 101 1;
 102 __END__
 103
 104 =head1 NAME
 105
 106 C4::Linker::Default - match only if there is a single matching auth
 107
 108 =cut