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