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123 lines
3.0 KiB
123 lines
3.0 KiB
package C4::Linker;
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# Copyright 2011 C & P Bibliography Services
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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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C4::Linker - Base class for linking authorities to bibliographic records
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=head1 SYNOPSIS
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use C4::Linker (%params );
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=head1 DESCRIPTION
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Base class for C4::Linker::X. Subclasses need to provide the following methods
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B<get_link ($field)> - return the authid for the authority that should be
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linked to the provided MARC::Field object, and a boolean to indicate whether
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the match is "fuzzy" (the semantics of "fuzzy" are up to the individual plugin).
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In order to handle authority limits, get_link should always end with:
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return $self->SUPER::_handle_auth_limit($authid), $fuzzy;
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B<update_cache ($heading, $authid)> - updates internal linker cache for
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$heading with $authid of a new created authotiry record
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B<flip_heading ($field)> - return a MARC::Field object with the heading flipped
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to the preferred form.
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=head1 FUNCTIONS
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=cut
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use strict;
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use warnings;
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use C4::Context;
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use base qw(Class::Accessor);
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__PACKAGE__->mk_accessors(qw( ));
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sub new {
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my $class = shift;
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my $param = shift;
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my $self = {};
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while ( my ( $key, $value ) = each %$param ) {
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if ( $key eq 'auth_limit' && $value ) {
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my $dbh = C4::Context->dbh;
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my $sql =
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"SELECT authid FROM auth_header WHERE $value ORDER BY authid ASC";
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my $sth = $dbh->prepare($sql);
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$sth->execute();
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while ( my ($authid) = $sth->fetchrow_array() ) {
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push @{ $self->{'auths_to_link'} }, $authid;
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}
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}
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elsif ( $key eq 'options' && $value ) {
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foreach my $opt ( split( /\|/, $value ) ) {
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$self->{$opt} = 1;
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}
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}
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elsif ($value) {
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$self->{$key} = $value;
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}
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}
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bless $self, $class;
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return $self;
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}
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=head2 _handle_auth_limit
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return $self->SUPER::_handle_auth_limit($authid), $fuzzy;
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Function to be called by subclasses to handle authority record limits.
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=cut
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sub _handle_auth_limit {
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my $self = shift;
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my $authid = shift;
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if ( defined $self->{'auths_to_link'} && defined $authid && !grep { $_ == $authid }
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@{ $self->{'auths_to_link'} } )
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{
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undef $authid;
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}
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return $authid;
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}
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=head2 EXPORT
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None by default.
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=head1 SEE ALSO
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C4::Linker::Default
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=head1 AUTHOR
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Jared Camins-Esakov, C & P Bibliography Services, E<lt>jcamins@cpbibliography.comE<gt>
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=cut
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1;
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__END__
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