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 $auth_type = $heading->auth_type();
  34     my $authid;
  35     my $fuzzy = 0;
  36
  37     if ( $self->{'cache'}->{$search_form.$auth_type}->{'cached'} ) {
  38         $authid = $self->{'cache'}->{$search_form.$auth_type}->{'authid'};
  39         $fuzzy  = $self->{'cache'}->{$search_form.$auth_type}->{'fuzzy'};
  40     }
  41     else {
  42
  43         # look for matching authorities
  44         my $authorities = $heading->authorities(1);    # $skipmetadata = true
  45
  46         if ( $behavior eq 'default' && $#{$authorities} == 0 ) {
  47             $authid = $authorities->[0]->{'authid'};
  48         }
  49         elsif ( $behavior eq 'first' && $#{$authorities} >= 0 ) {
  50             $authid = $authorities->[0]->{'authid'};
  51             $fuzzy  = $#{$authorities} > 0;
  52         }
  53         elsif ( $behavior eq 'last' && $#{$authorities} >= 0 ) {
  54             $authid = $authorities->[ $#{$authorities} ]->{'authid'};
  55             $fuzzy  = $#{$authorities} > 0;
  56         }
  57
  58         if ( !defined $authid && $self->{'broader_headings'} ) {
  59             my $field     = $heading->field();
  60             my @subfields = grep { $_->[0] ne '9' } $field->subfields();
  61             if ( scalar @subfields > 1 ) {
  62                 pop @subfields;
  63                 $field =
  64                     MARC::Field->new(
  65                         $field->tag,
  66                         $field->indicator(1),
  67                         $field->indicator(2),
  68                         map { $_->[0] => $_->[1] } @subfields
  69                     );
  70                 ( $authid, $fuzzy ) =
  71                   $self->get_link( C4::Heading->new_from_bib_field($field),
  72                     $behavior );
  73             }
  74         }
  75
  76         $self->{'cache'}->{$search_form.$auth_type}->{'cached'} = 1;
  77         $self->{'cache'}->{$search_form.$auth_type}->{'authid'} = $authid;
  78         $self->{'cache'}->{$search_form.$auth_type}->{'fuzzy'}  = $fuzzy;
  79     }
  80     return $self->SUPER::_handle_auth_limit($authid), $fuzzy;
  81 }
  82
  83 sub update_cache {
  84     my $self        = shift;
  85     my $heading     = shift;
  86     my $authid      = shift;
  87     my $search_form = $heading->search_form();
  88     my $auth_type = $heading->auth_type();
  89     my $fuzzy = 0;
  90
  91     $self->{'cache'}->{$search_form.$auth_type}->{'cached'} = 1;
  92     $self->{'cache'}->{$search_form.$auth_type}->{'authid'} = $authid;
  93     $self->{'cache'}->{$search_form.$auth_type}->{'fuzzy'}  = $fuzzy;
  94 }
  95
  96 sub flip_heading {
  97     my $self    = shift;
  98     my $heading = shift;
  99
 100     # TODO: implement
 101 }
 102
 103 1;
 104 __END__
 105
 106 =head1 NAME
 107
 108 C4::Linker::Default - match only if there is a single matching auth
 109
 110 =cut