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package C4::Heading;
# Copyright (C) 2008 LibLime
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA 02111-1307 USA
use strict;
use MARC::Record;
use MARC::Field;
use Koha;
use C4::Context;
use C4::Heading::MARC21;
use C4::Search;
our $VERSION = 3.00;
=head1 NAME
C4::Heading
=head1 SYNOPSIS
use C4::Heading;
my $heading = C4::Heading->new_from_bib_field($field);
my $thesaurus = $heading->thesaurus();
my $type = $heading->type();
my $display_heading = $heading->display();
my $search_string = $heading->search_string();
=head1 DESCRIPTION
C<C4::Heading> implements a simple class to representing
headings found in bibliographic and authority records.
=head1 METHODS
=head2 new_from_bib_field
=over 4
my $heading = C4::Heading->new_from_bib_field($field[, $marc_flavour]);
=back
Given a C<MARC::Field> object containing a heading from a
bib record, create a C<C4::Heading> object.
The optional second parameter is the MARC flavour (i.e., MARC21
or UNIMARC); if this parameter is not supplied, it is
taken from the Koha application context.
If the MARC field supplied is not a valid heading, undef
is returned.
=cut
sub new_from_bib_field {
my $class = shift;
my $field = shift;
my $marcflavour = @_ ? shift : C4::Context->preference('marcflavour');
my $marc_handler = _marc_format_handler($marcflavour);
my $tag = $field->tag();
return unless $marc_handler->valid_bib_heading_tag($tag);
my $self = {};
($self->{'auth_type'}, $self->{'subject_added_entry'}, $self->{'series_added_entry'}, $self->{'main_entry'},
$self->{'thesaurus'}, $self->{'search_form'}, $self->{'display_form'}) =
$marc_handler->parse_heading($field);
bless $self, $class;
return $self;
}
=head2 display_form
=over 4
my $display = $heading->display_form();
=back
Return the "canonical" display form of the heading.
=cut
sub display_form {
my $self = shift;
return $self->{'display_form'};
}
=head2 authorities
=over 4
my $authorities = $heading->authorities;
=back
Return a list of authority records for this
heading.
=cut
sub authorities {
my $self = shift;
my $query = qq(Match-heading,ext="$self->{'search_form'}");
$query .= $self->_query_limiters();
my ($error, $results, $total_hits) = SimpleSearch( $query, undef, undef, [ "authorityserver" ] );
return $results;
}
=head2 preferred_authorities
=over 4
my $preferred_authorities = $heading->preferred_authorities;
=back
Return a list of authority records for headings
that are a preferred form of the heading.
=cut
sub preferred_authorities {
my $self = shift;
my $query = "Match-heading-see-from,ext='$self->{'search_form'}'";
$query .= $self->_query_limiters();
my ($error, $results, $total_hits) = SimpleSearch( $query, undef, undef, [ "authorityserver" ] );
return $results;
}
=head1 INTERNAL METHODS
=head2 _query_limiters
=cut
sub _query_limiters {
my $self = shift;
my $limiters = " AND at='$self->{'auth_type'}'";
if ($self->{'subject_added_entry'}) {
$limiters .= " AND Heading-use-subject-added-entry=a"; # FIXME -- is this properly in C4::Heading::MARC21?
$limiters .= " AND Subject-heading-thesaurus=$self->{'thesaurus'}";
}
if ($self->{'series_added_entry'}) {
$limiters .= " AND Heading-use-series-added-entry=a"; # FIXME -- is this properly in C4::Heading::MARC21?
}
if (not $self->{'subject_added_entry'} and not $self->{'series_added_entry'}) {
$limiters .= " AND Heading-use-main-or-added-entry=a" # FIXME -- is this properly in C4::Heading::MARC21?
}
return $limiters;
}
=head1 INTERNAL FUNCTIONS
=head2 _marc_format_handler
Returns a C4::Heading::MARC21 or C4::Heading::UNIMARC object
depending on the selected MARC flavour.
=cut
sub _marc_format_handler {
my $marcflavour = shift;
if ($marcflavour eq 'UNIMARC') {
return C4::Heading::UNIMARC->new();
} else {
return C4::Heading::MARC21->new();
}
}
=head1 AUTHOR
Koha Developement team <info@koha.org>
Galen Charlton <galen.charlton@liblime.com>
=cut
1;
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