Bug 13969: Replace calls to $sth->fetchrow* with a call to $dbh->selectrow* and Clean...
[koha.git] / 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