1 | ###########################################################################
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2 | #
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3 | # NpepaList.pm -- website plugin
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4 | #
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5 | # A component of the Greenstone digital library software
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6 | # from the New Zealand Digital Library Project at the
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7 | # University of Waikato, New Zealand.
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8 | #
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9 | # Copyright (C) 1999 New Zealand Digital Library Project
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10 | #
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11 | # This program is free software; you can redistribute it and/or modify
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12 | # it under the terms of the GNU General Public License as published by
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13 | # the Free Software Foundation; either version 2 of the License, or
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14 | # (at your option) any later version.
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15 | #
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16 | # This program is distributed in the hope that it will be useful,
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17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | # GNU General Public License for more details.
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20 | #
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21 | # You should have received a copy of the GNU General Public License
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22 | # along with this program; if not, write to the Free Software
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23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 | #
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25 | ###########################################################################
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26 |
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27 | # There should probably be a general classifier to do this kind of stuff
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28 |
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29 | package NPepaList;
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30 |
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31 | sub new {
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32 | my ($class, @options) = @_;
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33 |
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34 | return bless {
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35 | 'list'=>{},
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36 | 'metaname' => 'Series',
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37 | 'sortname' => 'Date'
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38 | }, $class;
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39 | }
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40 |
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41 | sub init {
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42 | my $self = shift (@_);
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43 |
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44 | $self->{'list'} = {};
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45 | }
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46 |
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47 |
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48 | sub classify {
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49 | my $self = shift (@_);
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50 | my ($doc_obj) = @_;
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51 |
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52 | my $doc_OID = $doc_obj->get_OID();
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53 |
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54 | # want to ignore abstracts
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55 | my $doctype = $doc_obj->get_metadata_element($doc_obj->get_top_section(), 'doctype');
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56 | return if (defined $doctype && $doctype eq 'Description');
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57 |
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58 | my $date = $doc_obj->get_metadata_element($doc_obj->get_top_section(),
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59 | $self->{'sortname'});
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60 | # commentaries have no date but we want them to sort to the top
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61 | $date = '00000000' unless defined $date;
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62 |
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63 | my $series = $doc_obj->get_metadata_element ($doc_obj->get_top_section(),
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64 | $self->{'metaname'});
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65 |
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66 | if (defined $series) {
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67 | if (!defined $self->{'list'}->{$series}) {
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68 | $self->{'list'}->{$series} = {};
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69 | }
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70 | if (defined $self->{'list'}->{$series}->{$doc_OID}) {
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71 | print STDERR "WARNING: NPepaList::classify called multiple times for $doc_OID\n";
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72 | }
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73 | $self->{'list'}->{$series}->{$doc_OID} = $date;
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74 | } else {
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75 | print STDERR "WARNING: NpepaList::classify $doc_OID has no Series metadata\n";
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76 | }
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77 | }
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78 |
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79 |
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80 | sub get_classify_info {
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81 | my $self = shift (@_);
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82 |
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83 | my $classifyinfo = $self->get_entry ('Series', 'VList', 'Invisible');
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84 |
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85 | foreach $series (sort keys %{$self->{'list'}}) {
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86 | my $cinfo = $self->get_entry ($series, 'VList');
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87 | foreach $OID (sort {$self->{'list'}->{$series}->{$a}
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88 | cmp $self->{'list'}->{$series}->{$b};} keys %{$self->{'list'}->{$series}}) {
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89 | push (@{$cinfo->{'contains'}}, {'OID'=>$OID});
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90 | }
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91 | push (@{$classifyinfo->{'contains'}}, $cinfo);
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92 | }
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93 |
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94 | return $classifyinfo;
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95 | }
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96 |
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97 | sub get_entry {
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98 | my $self = shift (@_);
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99 | my ($title, $childtype, $thistype) = @_;
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100 |
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101 | # organise into classification structure
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102 | my %classifyinfo = ('childtype'=>$childtype,
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103 | 'Title'=>$title,
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104 | 'contains'=>[]);
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105 | $classifyinfo{'thistype'} = $thistype
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106 | if defined $thistype && $thistype =~ /\w/;
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107 |
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108 | return \%classifyinfo;
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109 | }
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110 |
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111 | 1;
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