C4/ClassSortRoutine.pm

   1 package C4::ClassSortRoutine;
   2
   3 # Copyright (C) 2007 LibLime
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it under the
   8 # terms of the GNU General Public License as published by the Free Software
   9 # Foundation; either version 2 of the License, or (at your option) any later
  10 # version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  14 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License along
  17 # with Koha; if not, write to the Free Software Foundation, Inc.,
  18 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20 use strict;
  21 use warnings;
  22
  23 require Exporter;
  24 use Class::Factory::Util;
  25 use C4::Context;
  26
  27 use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
  28
  29 # set the version for version checking
  30 $VERSION = 3.07.00.049;
  31
  32 =head1 NAME
  33
  34 C4::ClassSortRoutine - base object for creation of classification sorting
  35                        key generation routines
  36
  37 =head1 SYNOPSIS
  38
  39 use C4::ClassSortRoutine;
  40
  41 =head1 FUNCTIONS
  42
  43 =cut
  44
  45 @ISA    = qw(Exporter);
  46 @EXPORT = qw(
  47    &GetSortRoutineNames
  48    &GetClassSortKey
  49 );
  50
  51 # intialization code
  52 my %loaded_routines = ();
  53 my @sort_routines = GetSortRoutineNames();
  54 foreach my $sort_routine (@sort_routines) {
  55     if (eval "require C4::ClassSortRoutine::$sort_routine") {
  56         my $ref;
  57         eval "\$ref = \\\&C4::ClassSortRoutine::${sort_routine}::get_class_sort_key";
  58         if (eval "\$ref->(\"a\", \"b\")") {
  59             $loaded_routines{$sort_routine} = $ref;
  60         } else {
  61             $loaded_routines{$sort_routine} = \&_get_class_sort_key;
  62         }
  63     } else {
  64         $loaded_routines{$sort_routine} = \&_get_class_sort_key;
  65     }
  66 }
  67
  68 =head2 GetSortRoutineNames
  69
  70   my @routines = GetSortRoutineNames();
  71
  72 Get names of all modules under C4::ClassSortRoutine::*.  Adding
  73 a new classification sorting routine can therefore be done
  74 simply by writing a new submodule under C4::ClassSortRoutine and
  75 placing it in the C4/ClassSortRoutine directory.
  76
  77 =cut
  78
  79 sub GetSortRoutineNames {
  80     return C4::ClassSortRoutine->subclasses();
  81 }
  82
  83 =head2  GetClassSortKey
  84
  85   my $cn_sort = GetClassSortKey($sort_routine, $cn_class, $cn_item);
  86
  87 Generates classification sorting key.  If $sort_routine does not point
  88 to a valid submodule in C4::ClassSortRoutine, default to a basic
  89 normalization routine.
  90
  91 =cut
  92
  93 sub GetClassSortKey {
  94     my ($sort_routine, $cn_class, $cn_item) = @_;
  95     unless (exists $loaded_routines{$sort_routine}) {
  96         warn "attempting to use non-existent class sorting routine $sort_routine\n";
  97         $loaded_routines{$sort_routine} = \&_get_class_sort_key;
  98     }
  99     my $key = $loaded_routines{$sort_routine}->($cn_class, $cn_item);
 100     # FIXME -- hardcoded length for cn_sort
 101     # should replace with some way of getting column widths from
 102     # the DB schema -- since doing this should ideally be
 103     # independent of the DBMS, deferring for the moment.
 104     return substr($key, 0, 30);
 105 }
 106
 107 =head2 _get_class_sort_key
 108
 109 Basic sorting function.  Concatenates classification part
 110 and item, converts to uppercase, changes each run of
 111 whitespace to '_', and removes any non-digit, non-latin
 112 letter characters.
 113
 114 =cut
 115
 116 sub _get_class_sort_key {
 117     my ($cn_class, $cn_item) = @_;
 118     my $key = uc "$cn_class $cn_item";
 119     $key =~ s/\s+/_/;
 120     $key =~ s/[^A-Z_0-9]//g;
 121     return $key;
 122 }
 123
 124 1;
 125
 126 =head1 AUTHOR
 127
 128 Koha Development Team <http://koha-community.org/>
 129
 130 =cut
 131