1 | ###########################################################################
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2 | #
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3 | # AZSectionList.pm --
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 1999 New Zealand Digital Library Project
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9 | #
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10 | # This program is free software; you can redistribute it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 |
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26 | # classifier plugin for sorting sections alphabetically
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27 |
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28 | # this is very similar to AZList except it sorts by
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29 | # section level metadata (excluding the top level)
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30 | # instead of just top level metadata
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31 |
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32 | # the only change is to the classify() subroutine which
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33 | # must now iterate through each section, adding each
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34 | # to the classification
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35 |
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36 | # 12/05/02 Added usage datastructure - John Thompson
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37 |
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38 | package AZSectionList;
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39 |
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40 | use AZList;
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41 | use sorttools;
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42 |
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43 | sub BEGIN {
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44 | @ISA = ('AZList');
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45 | }
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46 |
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47 | my $options = { 'name' => "AZSectionList",
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48 | 'desc' => "{AZSectionList.desc}",
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49 | 'abstract' => "no",
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50 | 'inherits' => "yes" };
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51 |
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52 |
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53 | sub new {
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54 | my $class = shift (@_);
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55 | my $self = new AZList($class, @_);
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56 |
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57 | # 14-05-02 To allow for proper inheritance of arguments - John Thompson
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58 | my $option_list = $self->{'option_list'};
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59 | push( @{$option_list}, $options );
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60 |
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61 | #if ($self->{'info_only'}) {
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62 | # created from classinfo.pl - don't need to parse the arguments
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63 | # return bless $self, $class;
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64 | #}
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65 |
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66 | return bless $self, $class;
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67 | }
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68 |
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69 | sub classify {
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70 | my $self = shift (@_);
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71 | my ($doc_obj) = @_;
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72 |
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73 | my $doc_OID = $doc_obj->get_OID();
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74 | my $thissection = $doc_obj->get_next_section ($doc_obj->get_top_section());
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75 |
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76 | while (defined $thissection) {
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77 | $self->classify_section ($thissection, $doc_obj);
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78 | $thissection = $doc_obj->get_next_section ($thissection);
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79 | }
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80 | }
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81 |
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82 | sub classify_section {
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83 | my $self = shift (@_);
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84 | my ($section, $doc_obj) = @_;
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85 |
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86 | my $doc_OID = $doc_obj->get_OID();
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87 |
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88 | my $metavalue;
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89 | my $metaname;
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90 |
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91 | if (!defined $self->{'meta_list'}) {
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92 | # just in case
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93 | return;
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94 | }
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95 |
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96 | # find the first available metadata
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97 | foreach $m (@{$self->{'meta_list'}}) {
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98 | $metavalue = $doc_obj->get_metadata_element($section, $m);
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99 | $metaname = $m;
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100 | last if defined $metavalue;
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101 | }
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102 |
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103 | # if this section doesn't contain the metadata element we're
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104 | # sorting by we won't include it in this classification
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105 |
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106 | if (defined $metavalue && $metavalue ne "") {
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107 | if ($self->{'removeprefix'}) {
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108 | $metavalue =~ s/^$self->{'removeprefix'}//;
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109 | }
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110 |
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111 | $metavalue = $self->format_metadata_for_sorting($metaname, $metavalue, $doc_obj);
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112 | if (defined $self->{'list'}->{"$doc_OID.$section"}) {
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113 | my $outhandle = $self->{'outhandle'};
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114 | print $outhandle "WARNING: AZSectionList::classify called multiple times " .
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115 | "for $doc_OID.$section\n";
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116 | }
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117 | $self->{'list'}->{"$doc_OID.$section"} = $metavalue;
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118 | }
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119 | }
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120 |
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121 |
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122 | 1;
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