| 1 | ###########################################################################
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| 2 | #
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| 3 | # DateList.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 by date
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| 27 |
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| 28 | # date is assumed to be in the form yyyymmdd
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| 29 |
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| 30 | # at present dates are split by year - this should change
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| 31 | # jrm21 - added option "bymonth", which splits by year and month.
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| 32 |
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| 33 | # 23/09/03 Added some more options -kjdon.
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| 34 | # these include:
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| 35 | # -nogroup, which makes each year (or year+month) an individual entry in
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| 36 | # the horizontal list and prevents compaction
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| 37 | # -metadata, use a different metadata for the date (instead of Date), still expects yyyymmdd format. this affects display cos greenstone displays Date metadata as dd month yyyy, whereas any other date metadata is displayed as yyyymmdd - this needs fixing
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| 38 | # -sort specifies an additional metadata to use in sorting, will take affect when two docs have the same date.
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| 39 |
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| 40 | package DateList;
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| 41 |
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| 42 | use BasClas;
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| 43 | use sorttools;
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| 44 |
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| 45 | sub BEGIN {
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| 46 | @ISA = ('BasClas');
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| 47 | }
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| 48 |
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| 49 | my $arguments =
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| 50 | [ { 'name' => "metadata",
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| 51 | 'desc' => "{DateList.metadata}",
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| 52 | 'type' => "metadata",
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| 53 | 'deft' => "Date",
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| 54 | 'reqd' => "no" } ,
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| 55 | { 'name' => "sort",
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| 56 | 'desc' => "{DateList.sort}",
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| 57 | 'type' => "metadata",
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| 58 | 'reqd' => "no" } ,
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| 59 | { 'name' => "bymonth",
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| 60 | 'desc' => "{DateList.bymonth}",
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| 61 | 'type' => "flag",
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| 62 | 'reqd' => "no" },
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| 63 | { 'name' => "nogroup",
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| 64 | 'desc' => "{DateList.nogroup}",
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| 65 | 'type' => "flag",
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| 66 | 'reqd' => "no" },
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| 67 |
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| 68 | ];
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| 69 |
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| 70 | my $options = { 'name' => "DateList",
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| 71 | 'desc' => "{DateList.desc}",
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| 72 | 'abstract' => "no",
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| 73 | 'inherits' => "yes",
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| 74 | 'args' => $arguments };
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| 75 |
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| 76 |
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| 77 | sub new {
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| 78 | my $class = shift (@_);
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| 79 | my $self = new BasClas($class, @_);
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| 80 |
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| 81 | # 14-05-02 To allow for proper inheritance of arguments - John Thompson
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| 82 | my $option_list = $self->{'option_list'};
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| 83 | push( @{$option_list}, $options );
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| 84 |
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| 85 | if ($self->{'info_only'}) {
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| 86 | # created from classinfo.pl - don't need to parse the arguments
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| 87 | return bless $self, $class;
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| 88 | }
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| 89 |
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| 90 | $self->{'list'} = {};
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| 91 |
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| 92 | my ($datemeta, $sortmeta);
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| 93 | $self->{'nogroup'}=0;
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| 94 | if (!parsargv::parse(\@_,
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| 95 | q^bymonth^, \$self->{'bymonth'},
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| 96 | q^nogroup^, \$self->{'nogroup'},
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| 97 | q^metadata/.*/^, \$datemeta,
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| 98 | q^sort/.*/^, \$sortmeta,
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| 99 | "allow_extra_options")) {
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| 100 | $self->print_txt_usage(""); # Use default resource bundle
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| 101 | die "\n";
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| 102 | }
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| 103 |
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| 104 | if (!defined $datemeta || $datemeta eq "") {
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| 105 | $datemeta = "Date";
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| 106 | }
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| 107 | $self->{'datemeta'} = $datemeta;
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| 108 |
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| 109 | if (defined $sortmeta && $sortmeta ne "") {
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| 110 | $self->{'sortmeta'} = $sortmeta;
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| 111 | }
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| 112 | return bless $self, $class;
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| 113 | }
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| 114 |
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| 115 | sub init {
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| 116 | my $self = shift (@_);
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| 117 |
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| 118 | $self->{'list'} = {};
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| 119 | }
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| 120 |
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| 121 | sub classify {
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| 122 | my $self = shift (@_);
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| 123 | my ($doc_obj) = @_;
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| 124 |
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| 125 | my $doc_OID = $doc_obj->get_OID();
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| 126 | my $date = $doc_obj->get_metadata_element ($doc_obj->get_top_section(), $self->{'datemeta'});
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| 127 |
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| 128 | my $sort_other = "";
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| 129 | if (defined $self->{'sortmeta'} && $self->{'sortmeta'} ne "") {
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| 130 | $sort_other = $doc_obj->get_metadata_element ($doc_obj->get_top_section(), $self->{'sortmeta'});
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| 131 | }
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| 132 | # if this document doesn't contain Date element we won't
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| 133 | # include it in this classification
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| 134 | if (defined $date && $date =~ /\d/) {
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| 135 | if (defined $self->{'list'}->{$doc_OID}) {
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| 136 | my $outhandle = $self->{'outhandle'};
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| 137 | print $outhandle "WARNING: DateList::classify called multiple times for $doc_OID\n";
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| 138 | }
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| 139 |
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| 140 |
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| 141 | $self->{'list'}->{$doc_OID} = "$date$sort_other";
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| 142 | }
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| 143 | }
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| 144 |
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| 145 |
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| 146 | sub get_classify_info {
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| 147 | my $self = shift (@_);
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| 148 |
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| 149 | my @classlist = sort {$self->{'list'}->{$a} cmp $self->{'list'}->{$b};} keys %{$self->{'list'}};
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| 150 |
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| 151 | return $self->splitlist (\@classlist);
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| 152 | }
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| 153 |
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| 154 |
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| 155 | sub get_entry {
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| 156 | my $self = shift (@_);
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| 157 | my ($title, $childtype, $thistype) = @_;
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| 158 |
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| 159 | # organise into classification structure
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| 160 | my %classifyinfo = ('childtype'=>$childtype,
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| 161 | 'Title'=>$title,
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| 162 | 'contains'=>[],
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| 163 | 'mdtype'=>$self->{'datemeta'});
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| 164 | $classifyinfo{'thistype'} = $thistype
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| 165 | if defined $thistype && $thistype =~ /\w/;
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| 166 |
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| 167 | return \%classifyinfo;
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| 168 | }
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| 169 |
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| 170 | # splitlist takes an ordered list of classifications (@$classlistref) and
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| 171 | # splits it up into sub-sections by date
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| 172 | sub splitlist {
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| 173 | my $self = shift (@_);
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| 174 | my ($classlistref) = @_;
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| 175 | my $classhash = {};
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| 176 |
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| 177 | # top level
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| 178 | my $childtype = "HList";
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| 179 |
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| 180 | if (scalar (@$classlistref) <= 39 &&
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| 181 | !$self->{'nogroup'}) {$childtype = "DateList";}
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| 182 | my $classifyinfo = $self->get_entry ("Date", $childtype, "Invisible");
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| 183 | # don't need to do any splitting if there are less than 39 (max + min -1)
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| 184 | # classifications, unless nogroup is specified
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| 185 | if ((scalar @$classlistref) <= 39 && !$self->{'nogroup'}) {
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| 186 | foreach $subOID (@$classlistref) {
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| 187 | push (@{$classifyinfo->{'contains'}}, {'OID'=>$subOID});
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| 188 | }
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| 189 | return $classifyinfo;
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| 190 | }
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| 191 |
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| 192 |
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| 193 | if ($self->{'bymonth'}) {
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| 194 | # first split up the list into separate year+month classifications
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| 195 |
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| 196 | if (!$self->{'nogroup'}) { # hlist of year+month pairs
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| 197 | # single level of classifications
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| 198 | foreach $classification (@$classlistref) {
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| 199 | my $date = $self->{'list'}->{$classification};
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| 200 | $date =~ s/^(\d\d\d\d)(\d\d).*$/$1 _textmonth$2_/;
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| 201 | # sanity check if month is zero
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| 202 | if ($date =~ /00_$/) {
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| 203 | $date =~ s/^(\d\d\d\d).*$/$1/g;
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| 204 | }
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| 205 | $classhash->{$date} = [] unless defined $classhash->{$date};
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| 206 | push (@{$classhash->{$date}}, $classification);
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| 207 | }
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| 208 |
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| 209 | } else { # don't group - individual years and months
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| 210 | foreach $classification (@$classlistref) {
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| 211 | my $date = $self->{'list'}->{$classification};
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| 212 | $date =~ s/^(\d\d\d\d)(\d\d).*$/$1 _textmonth$2_/;
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| 213 | my ($year, $month)=($1,$2);
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| 214 | # sanity check if month is zero
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| 215 | if ($date =~ /00_$/) {
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| 216 | $date =~ s/^(\d\d\d\d).*$/$1/g;
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| 217 | }
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| 218 | # create subclass if it doesn't already exist
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| 219 | $classhash->{$year} = () unless defined $classhash->{$year};
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| 220 | $classhash->{$year}->{$month} = []
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| 221 | unless defined $classhash->{$year}->{$month};
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| 222 | push (@{$classhash->{$year}->{$month}}, $classification);
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| 223 | }
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| 224 | # create hlist of years containing hlists of months
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| 225 |
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| 226 | foreach my $subclass (sort {$a <=> $b} keys %$classhash) {
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| 227 | my $yearclassify = $self->get_entry($subclass, "HList");
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| 228 | foreach my $subsubclass (sort {$a <=> $b}
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| 229 | (keys %{$classhash->{$subclass}})) {
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| 230 | my $monthname=$subsubclass;
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| 231 | if ($monthname >= 1 && $monthname <= 12) {
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| 232 | $monthname="_textmonth" . $monthname . "_";
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| 233 | }
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| 234 | my $monthclassify=$self->get_entry($monthname, "DateList");
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| 235 | push (@{$yearclassify->{'contains'}}, $monthclassify);
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| 236 |
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| 237 | foreach $subsubOID
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| 238 | (@{$classhash->{$subclass}->{$subsubclass}}) {
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| 239 | push (@{$monthclassify->{'contains'}},
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| 240 | {'OID'=>$subsubOID});
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| 241 | }
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| 242 | }
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| 243 | push (@{$classifyinfo->{'contains'}}, $yearclassify);
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| 244 | }
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| 245 | return $classifyinfo;
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| 246 | } # nogroup
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| 247 | } else {
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| 248 | # not by month
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| 249 | # first split up the list into separate year classifications
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| 250 | foreach $classification (@$classlistref) {
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| 251 | my $date = $self->{'list'}->{$classification};
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| 252 | $date =~ s/^(\d\d\d\d).*$/$1/;
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| 253 | $classhash->{$date} = [] unless defined $classhash->{$date};
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| 254 | push (@{$classhash->{$date}}, $classification);
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| 255 | }
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| 256 | }
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| 257 |
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| 258 | # only compact the list if nogroup not specified
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| 259 | if (!$self->{'nogroup'}) {
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| 260 | $classhash = $self->compactlist ($classhash);
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| 261 | }
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| 262 | foreach $subclass (sort keys %$classhash) {
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| 263 | my $tempclassify = $self->get_entry($subclass, "DateList");
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| 264 | foreach $subsubOID (@{$classhash->{$subclass}}) {
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| 265 | push (@{$tempclassify->{'contains'}}, {'OID'=>$subsubOID});
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| 266 | }
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| 267 | push (@{$classifyinfo->{'contains'}}, $tempclassify);
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| 268 | }
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| 269 |
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| 270 | return $classifyinfo;
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| 271 | }
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| 272 |
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| 273 | sub compactlist {
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| 274 | my $self = shift (@_);
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| 275 | my ($classhashref) = @_;
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| 276 | my $compactedhash = {};
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| 277 | my @currentOIDs = ();
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| 278 | my $currentfirstdate = "";
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| 279 | my $currentlastdate = "";
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| 280 | my $lastkey = "";
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| 281 |
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| 282 | # minimum and maximum documents to be displayed per page.
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| 283 | # the actual maximum will be max + (min-1).
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| 284 | # the smallest sub-section is a single letter at present
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| 285 | # so in this case there may be many times max documents
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| 286 | # displayed on a page.
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| 287 | my $min = 10;
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| 288 | my $max = 30;
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| 289 | foreach my $subsection (sort keys %$classhashref) {
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| 290 | $currentfirstdate = $subsection if $currentfirstdate eq "";
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| 291 | if ((scalar (@currentOIDs) < $min) ||
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| 292 | ((scalar (@currentOIDs) + scalar (@{$classhashref->{$subsection}})) <= $max)) {
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| 293 | push (@currentOIDs, @{$classhashref->{$subsection}});
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| 294 | $currentlastdate = $subsection;
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| 295 | } else {
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| 296 |
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| 297 | if ($currentfirstdate eq $currentlastdate) {
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| 298 | @{$compactedhash->{$currentfirstdate}} = @currentOIDs;
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| 299 | $lastkey = $currentfirstdate;
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| 300 | } else {
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| 301 | @{$compactedhash->{"$currentfirstdate-$currentlastdate"}} = @currentOIDs;
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| 302 | $lastkey = "$currentfirstdate-$currentlastdate";
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| 303 | }
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| 304 | if (scalar (@{$classhashref->{$subsection}}) >= $max) {
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| 305 | $compactedhash->{$subsection} = $classhashref->{$subsection};
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| 306 | @currentOIDs = ();
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| 307 | $currentfirstdate = "";
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| 308 | $lastkey = $subsection;
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| 309 | } else {
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| 310 | @currentOIDs = @{$classhashref->{$subsection}};
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| 311 | $currentfirstdate = $subsection;
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| 312 | $currentlastdate = $subsection;
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| 313 | }
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| 314 | }
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| 315 | }
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| 316 |
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| 317 | # add final OIDs to last sub-classification if there aren't many otherwise
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| 318 | # add final sub-classification
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| 319 | if ((scalar (@currentOIDs) < $min) && (scalar (@currentOIDs) > 0)) {
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| 320 | # want every thing in previous up to the dash
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| 321 | my ($newkey) = $lastkey =~ /^([^\-]+)/;
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| 322 | @currentOIDs = (@{$compactedhash->{$lastkey}}, @currentOIDs);
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| 323 | delete $compactedhash->{$lastkey};
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| 324 | @{$compactedhash->{"$newkey-$currentlastdate"}} = @currentOIDs;
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| 325 | } else {
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| 326 | if ($currentfirstdate eq $currentlastdate) {
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| 327 | @{$compactedhash->{$currentfirstdate}} = @currentOIDs;
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| 328 | } else {
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| 329 | @{$compactedhash->{"$currentfirstdate-$currentlastdate"}} = @currentOIDs;
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| 330 | }
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| 331 | }
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| 332 |
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| 333 | return $compactedhash;
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| 334 | }
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| 335 |
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| 336 | 1;
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