[13900] | 1 | ###########################################################################
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| 2 | #
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| 3 | # RecentDocumentsList.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 | # simple list classifier plugin
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| 27 | # to see the options, run "perl -S classinfo.pl RecentDocumentsList"
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| 28 |
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| 29 | package RecentDocumentsList;
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| 30 |
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[17209] | 31 | use BaseClassifier;
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[13900] | 32 | use strict;
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| 33 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 34 | use sorttools;
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| 35 | use Time::Local;
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| 36 |
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| 37 | sub BEGIN {
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[17209] | 38 | @RecentDocumentsList::ISA = ('BaseClassifier');
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[13900] | 39 | }
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| 40 |
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| 41 | my $arguments =
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| 42 | [ { 'name' => "include_docs_added_since",
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| 43 | 'desc' => "{RecentDocumentsList.include_docs_added_since}",
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| 44 | 'type' => "string",
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| 45 | 'reqd' => "no" },
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| 46 | { 'name' => "include_most_recently_added",
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| 47 | 'desc' => "{RecentDocumentsList.include_most_recently_added}",
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| 48 | 'type' => "int",
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| 49 | 'deft' => "20",
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| 50 | 'reqd' => "no"},
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| 51 | { 'name' => "sort",
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| 52 | 'desc' => "{RecentDocumentsList.sort}",
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| 53 | 'type' => "metadata",
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| 54 | 'reqd' => "no"}
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| 55 | ];
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| 56 |
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| 57 | my $options = { 'name' => "RecentDocumentsList",
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| 58 | 'desc' => "{RecentDocumentsList.desc}",
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| 59 | 'abstract' => "no",
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| 60 | 'inherits' => "yes",
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| 61 | 'args' => $arguments };
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| 62 |
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| 63 |
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| 64 | sub new {
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| 65 | my ($class) = shift (@_);
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| 66 |
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| 67 | my ($classifierslist,$inputargs,$hashArgOptLists) = @_;
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| 68 | push(@$classifierslist, $class);
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| 69 |
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[17209] | 70 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 71 | push(@{$hashArgOptLists->{"OptList"}},$options);
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[13900] | 72 |
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[17209] | 73 | my $self = new BaseClassifier($classifierslist, $inputargs, $hashArgOptLists);
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[13900] | 74 |
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| 75 | if ($self->{'info_only'}) {
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| 76 | # don't worry about any options etc
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| 77 | return bless $self, $class;
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| 78 | }
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| 79 | # check the arguments
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| 80 |
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| 81 | if (!$self->{"buttonname"}) {
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| 82 | $self->{"buttonname"} = 'RecentDocuments';
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| 83 | }
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| 84 |
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| 85 | # we want either include_docs_added_since, or include_most_recently_added, but not both.
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| 86 | if (defined $self->{'include_docs_added_since'} && !($self->{'include_docs_added_since'} eq "")){
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| 87 | $self->{'classify_by_date'} = 1;
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| 88 | my ($year, $month, $day) = $self->{'include_docs_added_since'} =~
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| 89 | /^(\d\d\d\d)-?(\d\d)?-?(\d\d)?$/;
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| 90 | if (!defined $year) {
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| 91 | &gsprintf($self->{'outhandle'}, "RecentDocumentsList::init {RecentDocumentsList.date_wrong_format}\n");
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| 92 | die "\n";
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| 93 | }
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| 94 | if (!defined $month || $month < 1 || $month > 12) {
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| 95 | $month = "01";
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| 96 | $day = "01";
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| 97 | } elsif (!defined $day || $day < 1 || $day > 31) {
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| 98 | $day = "01";
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| 99 | }
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| 100 |
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| 101 | $self->{'classification_date'} = timelocal(0,0,0,$day,$month-1, $year);
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| 102 |
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| 103 | } else {
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| 104 | $self->{'classify_by_date'} = 0;
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| 105 | }
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| 106 | if ($self->{'sort'} eq "") {
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| 107 | undef $self->{'sort'};
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| 108 | }
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| 109 | # Further setup
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| 110 | $self->{'list'} = {};
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| 111 | # if we are getting top X docs, and sorting by meta, we need to store the
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| 112 | # date and the metadata
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| 113 | if (!$self->{'classify_by_date'} && $self->{'sort'}) {
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| 114 | $self->{'meta_list'} = {};
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| 115 | }
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| 116 | return bless $self, $class;
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| 117 | }
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| 118 |
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| 119 | sub init {
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| 120 | my $self = shift (@_);
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| 121 |
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| 122 | }
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| 123 |
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| 124 | sub classify {
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| 125 | my $self = shift (@_);
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| 126 | my ($doc_obj) = @_;
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| 127 |
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| 128 | my $doc_OID = $doc_obj->get_OID();
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| 129 | my $lastmodified = $doc_obj->get_metadata_element($doc_obj->get_top_section(), "lastmodified");
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| 130 | if (!defined $lastmodified || $lastmodified eq "") {
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| 131 | print $self->{'outhandle'}, "RecentDocumentsList: $doc_OID has no lastmodified metadata, not classifying\n";
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| 132 | return;
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| 133 | }
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| 134 |
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| 135 | # doc goes into classification if we are not classifying by date, or the date is after the cutoff date.
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| 136 | if ($self->{'classify_by_date'}) {
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| 137 | if ($lastmodified > $self->{'classification_date'}) {
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| 138 | my $sort_meta = $lastmodified;
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| 139 | if (defined $self->{'sort'}) {
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| 140 | $sort_meta = $doc_obj->get_metadata_element($doc_obj->get_top_section(), $self->{'sort'});
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| 141 | }
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| 142 | $self->{'list'}->{$doc_OID} = $sort_meta;
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| 143 | $doc_obj->add_metadata($doc_obj->get_top_section(), "memberof", "CL".$self->get_number());
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| 144 | }
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| 145 | } else {
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| 146 |
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| 147 | # need to store metadata as well...
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| 148 | $self->{'list'}->{$doc_OID} = $lastmodified;
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| 149 | if (defined $self->{'sort'}) {
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| 150 | my $sort_meta = $doc_obj->get_metadata_element($doc_obj->get_top_section(), $self->{'sort'});
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| 151 | $self->{'meta_list'}->{$doc_OID} = $sort_meta;
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| 152 | }
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| 153 | }
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| 154 |
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| 155 | }
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| 156 |
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| 157 |
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| 158 | sub get_classify_info {
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| 159 | my $self = shift (@_);
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| 160 | my $return_doc_size=0;
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| 161 |
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| 162 | my $list = $self->{'list'};
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| 163 |
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| 164 |
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| 165 | # organise into classification structure
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| 166 | my %classifyinfo = ('thistype'=>'Invisible',
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| 167 | 'childtype'=>'VList',
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| 168 | 'Title'=>$self->{'buttonname'},
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| 169 | 'contains'=>[]);
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| 170 |
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| 171 |
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| 172 | # may or may not support memberof, depending on options set
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| 173 | $classifyinfo{'supportsmemberof'} = &supports_memberof();
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| 174 |
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| 175 | # get either all documents (sorted by date), or the top X docs
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| 176 | my @sorted_docs = sort {$self->date_or_metadata_sort($a,$b)} keys %{$self->{'list'}};
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| 177 | my $numdocs = $self->{'include_most_recently_added'};
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| 178 | if ($self->{'classify_by_date'}) {
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| 179 | # just include all docs in the list
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| 180 | $numdocs = scalar (@sorted_docs);
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| 181 | } else {
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| 182 | if ($numdocs > scalar (@sorted_docs)) {
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| 183 | $numdocs = scalar (@sorted_docs);
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| 184 | }
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| 185 | if ($self->{'sort'}) {
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| 186 | # we need to sort further by metadata
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| 187 | # cut off the list
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| 188 | @sorted_docs = @sorted_docs[0..$numdocs-1];
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| 189 | # sort again
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| 190 | @sorted_docs = sort {$self->external_meta_sort($a,$b)}@sorted_docs;
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| 191 | }
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| 192 | }
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| 193 | for (my $i=0; $i<$numdocs; $i++) {
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| 194 | push (@{$classifyinfo{'contains'}}, {'OID'=> $sorted_docs[$i]});
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| 195 | }
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| 196 |
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| 197 |
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| 198 | return \%classifyinfo;
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| 199 | }
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| 200 |
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| 201 | # we can only support memberof if we have the include_docs_added_since option, otherwise we don't know at the time of classification of a document if it will be in the classifier or not.
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| 202 | sub supports_memberof {
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| 203 | my $self = shift(@_);
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| 204 |
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| 205 | if ($self->{'classify_by_date'}) {
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| 206 | return "true";
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| 207 | }
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| 208 | return "false";
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| 209 | }
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| 210 |
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| 211 | sub date_or_metadata_sort {
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| 212 | my ($self,$a,$b) = @_;
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| 213 | # make it do metadata too
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| 214 | my $date_a = $self->{'list'}->{$a};
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| 215 | my $date_b = $self->{'list'}->{$b};
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| 216 | if (!$self->{'sort'} || !$self->{'classify_by_date'}) {
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| 217 | # want reverse order (latest to earliest)
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| 218 | return ($date_b <=> $date_a);
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| 219 | }
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| 220 | # meta sorting, use string cmp
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| 221 | return ($date_a cmp $date_b);
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| 222 | }
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| 223 |
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| 224 | sub external_meta_sort {
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| 225 | my ($self,$a,$b) = @_;
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| 226 |
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| 227 | my $meta_a = $self->{'meta_list'}->{$a};
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| 228 | my $meta_b = $self->{'meta_list'}->{$b};
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| 229 |
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| 230 | return ($meta_a cmp $meta_b);
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| 231 | }
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| 232 |
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| 233 |
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| 234 | 1;
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| 235 |
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| 236 |
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| 237 |
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| 238 |
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