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 with
  17 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  18 # Suite 330, Boston, MA  02111-1307 USA
  19
  20 use strict;
  21 require Exporter;
  22 use Class::Factory::Util;
  23 use C4::Context;
  24 use C4::Koha;
  25
  26 use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
  27
  28 # set the version for version checking
  29 $VERSION = 3.00;
  30
  31 =head1 NAME
  32
  33 C4::ClassSortRoutine - base object for creation of classification sorting
  34                        key generation routines
  35
  36 =head1 SYNOPSIS
  37
  38 use C4::ClassSortRoutine;
  39
  40 =head1 FUNCTIONS
  41
  42 =cut
  43
  44 @ISA    = qw(Exporter);
  45 @EXPORT = qw(
  46    &GetSortRoutineNames
  47    &GetClassSortKey
  48 );
  49
  50 # intialization code
  51 my %loaded_routines = ();
  52 my @sort_routines = GetSortRoutineNames();
  53 foreach my $sort_routine (@sort_routines) {
  54     if (eval "require C4::ClassSortRoutine::$sort_routine") {
  55         my $ref;
  56         eval "\$ref = \\\&C4::ClassSortRoutine::${sort_routine}::get_class_sort_key";
  57         if (eval "\$ref->(\"a\", \"b\")") {
  58             $loaded_routines{$sort_routine} = $ref;
  59         } else {
  60             $loaded_routines{$sort_routine} = \&_get_class_sort_key;
  61         }
  62     } else {
  63         $loaded_routines{$sort_routine} = \&_get_class_sort_key;
  64     }
  65 }
  66
  67 =head2 GetSortRoutineNames
  68
  69   my @routines = GetSortRoutineNames();
  70
  71 Get names of all modules under C4::ClassSortRoutine::*.  Adding
  72 a new classification sorting routine can therefore be done
  73 simply by writing a new submodule under C4::ClassSortRoutine and
  74 placing it in the C4/ClassSortRoutine directory.
  75
  76 =cut
  77
  78 sub GetSortRoutineNames {
  79     return C4::ClassSortRoutine->subclasses();
  80 }
  81
  82 =head2  GetClassSortKey
  83
  84   my $cn_sort = GetClassSortKey($sort_routine, $cn_class, $cn_item);
  85
  86 Generates classification sorting key.  If $sort_routine does not point
  87 to a valid submodule in C4::ClassSortRoutine, default to a basic
  88 normalization routine.
  89
  90 =cut
  91
  92 sub GetClassSortKey {
  93     my ($sort_routine, $cn_class, $cn_item) = @_;
  94     unless (exists $loaded_routines{$sort_routine}) {
  95         warn "attempting to use non-existent class sorting routine $sort_routine\n";
  96         $loaded_routines{$sort_routine} = \&_get_class_sort_key;
  97     }
  98     my $key = $loaded_routines{$sort_routine}->($cn_class, $cn_item);
  99     # FIXME -- hardcoded length for cn_sort
 100     # should replace with some way of getting column widths from
 101     # the DB schema -- since doing this should ideally be
 102     # independent of the DBMS, deferring for the moment.
 103     return substr($key, 0, 30);
 104 }
 105
 106 =head2 _get_class_sort_key
 107
 108 Basic sorting function.  Concatenates classification part
 109 and item, converts to uppercase, changes each run of
 110 whitespace to '_', and removes any non-digit, non-latin
 111 letter characters.
 112
 113 =cut
 114
 115 sub _get_class_sort_key {
 116     my ($cn_class, $cn_item) = @_;
 117     my $key = uc "$cn_class $cn_item";
 118     $key =~ s/\s+/_/;
 119     $key =~ s/[^A-Z_0-9]//g;
 120     return $key;
 121 }
 122
 123 1;
 124
 125 =head1 AUTHOR
 126
 127 Koha Developement team <info@koha.org>
 128
 129 =cut
 130