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 MARC::Field;
  23 use C4::Heading;
  24
  25 use base qw(C4::Linker);
  26
  27 sub get_link {
  28     my $self        = shift;
  29     my $heading     = shift;
  30     my $behavior    = shift || 'default';
  31     my $search_form = $heading->search_form();
  32     my $auth_type = $heading->auth_type();
  33     my $thesaurus   = $heading->{thesaurus} || 'notdefined';
  34     my $authid;
  35     my $fuzzy = 0;
  36     my $match_count;
  37
  38     if ( $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'cached'} ) {
  39         $authid = $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'authid'};
  40         $fuzzy  = $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'fuzzy'};
  41         $match_count = $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'match_count'};
  42     }
  43     else {
  44
  45         # look for matching authorities
  46         my $authorities = $heading->authorities(1);    # $skipmetadata = true
  47         $match_count = scalar @$authorities;
  48
  49         if ( $behavior eq 'default' && $#{$authorities} == 0 ) {
  50             $authid = $authorities->[0]->{'authid'};
  51         }
  52         elsif ( $behavior eq 'first' && $#{$authorities} >= 0 ) {
  53             $authid = $authorities->[0]->{'authid'};
  54             $fuzzy  = $#{$authorities} > 0;
  55         }
  56         elsif ( $behavior eq 'last' && $#{$authorities} >= 0 ) {
  57             $authid = $authorities->[ $#{$authorities} ]->{'authid'};
  58             $fuzzy  = $#{$authorities} > 0;
  59         }
  60
  61         if ( !defined $authid && $self->{'broader_headings'} ) {
  62             my $field     = $heading->field();
  63             my @subfields = grep { $_->[0] ne '9' } $field->subfields();
  64             if ( scalar @subfields > 1 ) {
  65                 pop @subfields;
  66                 $field =
  67                     MARC::Field->new(
  68                         $field->tag,
  69                         $field->indicator(1),
  70                         $field->indicator(2),
  71                         map { $_->[0] => $_->[1] } @subfields
  72                     );
  73                 ( $authid, $fuzzy ) =
  74                   $self->get_link( C4::Heading->new_from_field($field),
  75                     $behavior );
  76             }
  77         }
  78
  79         $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'cached'} = 1;
  80         $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'authid'} = $authid;
  81         $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'fuzzy'}  = $fuzzy;
  82         $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'match_count'} = $match_count;
  83     }
  84     return $self->SUPER::_handle_auth_limit($authid), $fuzzy, $match_count;
  85 }
  86
  87 sub update_cache {
  88     my $self        = shift;
  89     my $heading     = shift;
  90     my $authid      = shift;
  91     my $search_form = $heading->search_form();
  92     my $auth_type = $heading->auth_type();
  93     my $thesaurus   = $heading->{thesaurus} || 'notdefined';
  94     my $fuzzy = 0;
  95
  96     $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'cached'} = 1;
  97     $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'authid'} = $authid;
  98     $self->{'cache'}->{$search_form.$auth_type.$thesaurus}->{'fuzzy'}  = $fuzzy;
  99 }
 100
 101 sub flip_heading {
 102     my $self    = shift;
 103     my $heading = shift;
 104
 105     # TODO: implement
 106 }
 107
 108 1;
 109 __END__
 110
 111 =head1 NAME
 112
 113 C4::Linker::Default - match only if there is a single matching auth
 114
 115 =cut