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(-)a/Koha/Filter/MARC/ExpandAuthorizedValues.pm (-1 / +133 lines)
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package Koha::Filter::MARC::ExpandAuthorizedValues;
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# Copyright 2022 PTFS Europe
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#
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Koha is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Koha; if not, see <http://www.gnu.org/licenses>.
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=head1 NAME
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Koha::Filter::MARC::ExpandAuthorizedValues - Replaces AV codes with descriptions in MARC::Record objects.
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=head1 SYNOPSIS
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  my $biblio = Koha::Biblios->find(
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      $biblio_id,
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      { prefetch => [ metadata ] }
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  );
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  my $record = $biblio->metadata->record;
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  my $record_processor = Koha::RecordProcessor->new(
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    {
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        filters => ['ExpandAuthorizedValues'],
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        options => {
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            interface => 'opac',
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        }
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    }
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  );
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  $record_processor->process($record);
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=head1 DESCRIPTION
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Filter to replace Koha AV codes in MARC::Records with their Koha AV descriptions.
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=cut
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use Modern::Perl;
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use C4::Biblio qw( GetAuthorisedValueDesc GetMarcStructure );
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use base qw(Koha::RecordProcessor::Base);
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our $NAME = 'ExpandAuthorizedValues';
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my %authval_per_framework; # Cache for tagfield-tagsubfield to decode per framework.
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=head2 filter
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Embed items into the MARC::Record object.
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=cut
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sub filter {
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    my $self   = shift;
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    my $record = shift;
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    return unless defined $record and ref($record) eq 'MARC::Record';
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    my $params        = $self->params;
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    my $interface     = $params->{options}->{interface} // 'opac';
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    my $opac          = $interface eq 'opac' ? 1 : 0;
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    my $frameworkcode = $params->{options}->{frameworkcode} // q{};
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    my $marcstructure = $params->{options}->{marcstructure}
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      // GetMarcStructure( 1, $frameworkcode, { unsafe => 1 } );
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    my $marcflavour = C4::Context->preference('marcflavour');
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    my $av          = _getAuthorisedValues4MARCSubfields($frameworkcode);
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    foreach my $tag ( keys %$av ) {
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        foreach my $field ( $record->field($tag) ) {
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            if ( $av->{$tag} ) {
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                my @new_subfields = ();
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                for my $subfield ( $field->subfields() ) {
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                    my ( $letter, $value ) = @$subfield;
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                    # Replace the field value with the authorised value
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                    # *except* for MARC21 field 942$n (suppression in opac)
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                    if ( !( $tag eq '942' && $subfield->[0] eq 'n' )
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                        || $marcflavour eq 'UNIMARC' )
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                    {
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                        $value =
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                          GetAuthorisedValueDesc( $tag, $letter, $value, '',
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                            $marcstructure, undef, $opac )
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                          if $av->{$tag}->{$letter};
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                    }
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                    push( @new_subfields, $letter, $value );
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                }
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                $field->replace_with(
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                    MARC::Field->new(
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                        $tag,                 $field->indicator(1),
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                        $field->indicator(2), @new_subfields
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                    )
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                );
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            }
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        }
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    }
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    return $record;
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}
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sub _getAuthorisedValues4MARCSubfields {
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    my ($frameworkcode) = @_;
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    unless ( $authval_per_framework{$frameworkcode} ) {
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        my $dbh = C4::Context->dbh;
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        my $sth = $dbh->prepare(
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            "SELECT DISTINCT tagfield, tagsubfield
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             FROM marc_subfield_structure
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             WHERE authorised_value IS NOT NULL
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                AND authorised_value!=''
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                AND frameworkcode=?"
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        );
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        $sth->execute($frameworkcode);
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        my $av = {};
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        while ( my ( $tag, $letter ) = $sth->fetchrow() ) {
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            $av->{$tag}->{$letter} = 1;
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        }
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        $authval_per_framework{$frameworkcode} = $av;
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    }
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    return $authval_per_framework{$frameworkcode};
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}
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1;

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