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129 lines
3.4 KiB
129 lines
3.4 KiB
package C4::ClassSortRoutine;
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# Copyright (C) 2007 LibLime
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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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use strict;
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use warnings;
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require Exporter;
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use Class::Factory::Util;
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use C4::Context;
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use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
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=head1 NAME
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C4::ClassSortRoutine - base object for creation of classification sorting
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key generation routines
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=head1 SYNOPSIS
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use C4::ClassSortRoutine;
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=head1 FUNCTIONS
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=cut
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@ISA = qw(Exporter);
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@EXPORT = qw(
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&GetSortRoutineNames
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&GetClassSortKey
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);
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# initialization code
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my %loaded_routines = ();
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my @sort_routines = GetSortRoutineNames();
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foreach my $sort_routine (@sort_routines) {
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if (eval "require C4::ClassSortRoutine::$sort_routine") {
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my $ref;
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$ref = \&{"C4::ClassSortRoutine::${sort_routine}::get_class_sort_key"};
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if (eval { $ref->("a", "b") }) {
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$loaded_routines{$sort_routine} = $ref;
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} else {
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$loaded_routines{$sort_routine} = \&_get_class_sort_key;
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}
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} else {
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$loaded_routines{$sort_routine} = \&_get_class_sort_key;
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}
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}
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=head2 GetSortRoutineNames
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my @routines = GetSortRoutineNames();
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Get names of all modules under C4::ClassSortRoutine::*. Adding
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a new classification sorting routine can therefore be done
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simply by writing a new submodule under C4::ClassSortRoutine and
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placing it in the C4/ClassSortRoutine directory.
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=cut
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sub GetSortRoutineNames {
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return C4::ClassSortRoutine->subclasses();
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}
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=head2 GetClassSortKey
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my $cn_sort = GetClassSortKey($sort_routine, $cn_class, $cn_item);
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Generates classification sorting key. If $sort_routine does not point
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to a valid submodule in C4::ClassSortRoutine, default to a basic
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normalization routine.
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=cut
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sub GetClassSortKey {
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my ($sort_routine, $cn_class, $cn_item) = @_;
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unless (exists $loaded_routines{$sort_routine}) {
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warn "attempting to use non-existent class sorting routine $sort_routine\n";
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$loaded_routines{$sort_routine} = \&_get_class_sort_key;
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}
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my $key = $loaded_routines{$sort_routine}->($cn_class, $cn_item);
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# FIXME -- hardcoded length for cn_sort
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# should replace with some way of getting column widths from
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# the DB schema -- since doing this should ideally be
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# independent of the DBMS, deferring for the moment.
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return substr($key, 0, 255);
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}
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=head2 _get_class_sort_key
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Basic sorting function. Concatenates classification part
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and item, converts to uppercase, changes each run of
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whitespace to '_', and removes any non-digit, non-latin
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letter characters.
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=cut
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sub _get_class_sort_key {
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my ($cn_class, $cn_item) = @_;
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my $key = uc "$cn_class $cn_item";
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$key =~ s/\s+/_/;
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$key =~ s/[^A-Z_0-9]//g;
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return $key;
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}
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1;
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=head1 AUTHOR
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Koha Development Team <http://koha-community.org/>
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=cut
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