| 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' => "reverse_sort",
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| 60 | 'desc' => "{DateList.reverse_sort}",
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| 61 | 'type' => "flag",
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| 62 | 'reqd' => "no" },
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| 63 | { 'name' => "bymonth",
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| 64 | 'desc' => "{DateList.bymonth}",
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| 65 | 'type' => "flag",
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| 66 | 'reqd' => "no" },
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| 67 | { 'name' => "nogroup",
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| 68 | 'desc' => "{DateList.nogroup}",
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| 69 | 'type' => "flag",
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| 70 | 'reqd' => "no" }
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| 71 | ];
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| 72 |
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| 73 | my $options = { 'name' => "DateList",
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| 74 | 'desc' => "{DateList.desc}",
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| 75 | 'abstract' => "no",
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| 76 | 'inherits' => "yes",
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| 77 | 'args' => $arguments };
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| 78 |
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| 79 |
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| 80 | sub new {
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| 81 | my ($class) = shift (@_);
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| 82 | my ($classifierslist,$inputargs,$hashArgOptLists) = @_;
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| 83 | push(@$classifierslist, $class);
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| 84 |
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| 85 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
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| 86 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
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| 87 |
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| 88 | my $self = (defined $hashArgOptLists)? new BasClas($classifierslist,$inputargs,$hashArgOptLists): new BasClas($classifierslist,$inputargs);
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| 89 |
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| 90 | # Manually set $self parameters.
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| 91 | $self->{'list'} = {};
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| 92 |
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| 93 | if (!defined $self->{"metadata"} || $self->{"metadata"} eq "") {
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| 94 | $self->{'metadata'} = "Date";
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| 95 | }
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| 96 |
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| 97 | return bless $self, $class;
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| 98 | }
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| 99 |
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| 100 | sub init {
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| 101 | my $self = shift (@_);
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| 102 |
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| 103 | $self->{'list'} = {};
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| 104 | }
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| 105 |
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| 106 | sub classify {
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| 107 | my $self = shift (@_);
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| 108 | my ($doc_obj) = @_;
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| 109 |
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| 110 | my $doc_OID = $doc_obj->get_OID();
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| 111 | my $date = $doc_obj->get_metadata_element ($doc_obj->get_top_section(), $self->{'metadata'});
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| 112 |
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| 113 | my $sort_other = "";
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| 114 | if (defined $self->{'sort'} && $self->{'sort'} ne "") {
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| 115 | $sort_other = $doc_obj->get_metadata_element ($doc_obj->get_top_section(), $self->{'sort'});
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| 116 | $sort_other = &sorttools::format_metadata_for_sorting($self->{'sort'}, $sort_other, $doc_obj);
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| 117 | }
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| 118 | # if this document doesn't contain Date element we won't
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| 119 | # include it in this classification
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| 120 | if (defined $date && $date =~ /\d/) {
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| 121 | if (defined $self->{'list'}->{$doc_OID}) {
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| 122 | my $outhandle = $self->{'outhandle'};
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| 123 | print $outhandle "WARNING: DateList::classify called multiple times for $doc_OID\n";
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| 124 | }
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| 125 |
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| 126 | $self->{'list'}->{$doc_OID} = "$date$sort_other";
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| 127 | }
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| 128 | }
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| 129 |
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| 130 |
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| 131 | sub get_classify_info {
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| 132 | my $self = shift (@_);
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| 133 |
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| 134 | my @classlist = sort {$self->{'list'}->{$a} cmp $self->{'list'}->{$b};} keys %{$self->{'list'}};
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| 135 | if ($self->{'reverse_sort'}) {
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| 136 | @classlist = reverse @classlist;
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| 137 | }
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| 138 |
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| 139 | return $self->splitlist (\@classlist);
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| 140 | }
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| 141 |
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| 142 |
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| 143 | sub get_entry {
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| 144 | my $self = shift (@_);
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| 145 | my ($title, $childtype, $thistype) = @_;
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| 146 |
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| 147 | # organise into classification structure
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| 148 | my %classifyinfo = ('childtype'=>$childtype,
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| 149 | 'Title'=>$title,
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| 150 | 'contains'=>[],
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| 151 | 'mdtype'=>$self->{'metadata'});
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| 152 | $classifyinfo{'thistype'} = $thistype
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| 153 | if defined $thistype && $thistype =~ /\w/;
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| 154 |
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| 155 | return \%classifyinfo;
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| 156 | }
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| 157 |
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| 158 | # splitlist takes an ordered list of classifications (@$classlistref) and
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| 159 | # splits it up into sub-sections by date
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| 160 | sub splitlist {
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| 161 | my $self = shift (@_);
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| 162 | my ($classlistref) = @_;
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| 163 | my $classhash = {};
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| 164 |
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| 165 | # top level
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| 166 | my $childtype = "HList";
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| 167 |
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| 168 | if (scalar (@$classlistref) <= 39 &&
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| 169 | !$self->{'nogroup'}) {$childtype = "DateList";}
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| 170 | my $classifyinfo = $self->get_entry ("Date", $childtype, "Invisible");
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| 171 | # don't need to do any splitting if there are less than 39 (max + min -1)
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| 172 | # classifications, unless nogroup is specified
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| 173 | if ((scalar @$classlistref) <= 39 && !$self->{'nogroup'}) {
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| 174 | foreach $subOID (@$classlistref) {
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| 175 | push (@{$classifyinfo->{'contains'}}, {'OID'=>$subOID});
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| 176 | }
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| 177 | return $classifyinfo;
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| 178 | }
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| 179 |
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| 180 |
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| 181 | if ($self->{'bymonth'}) {
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| 182 | # first split up the list into separate year+month classifications
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| 183 |
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| 184 | if (!$self->{'nogroup'}) { # hlist of year+month pairs
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| 185 | # single level of classifications
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| 186 | foreach $classification (@$classlistref) {
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| 187 | my $date = $self->{'list'}->{$classification};
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| 188 | $date =~ s/^(\d\d\d\d)(\d\d).*$/$1 _textmonth$2_/;
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| 189 | # sanity check if month is zero
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| 190 | if ($date =~ /00_$/) {
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| 191 | $date =~ s/^(\d\d\d\d).*$/$1/g;
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| 192 | }
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| 193 | $classhash->{$date} = [] unless defined $classhash->{$date};
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| 194 | push (@{$classhash->{$date}}, $classification);
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| 195 | }
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| 196 |
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| 197 | } else { # don't group - individual years and months
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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$2_/;
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| 201 | my ($year, $month)=($1,$2);
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| 202 | # sanity check if month is zero
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| 203 | if ($date =~ /00_$/) {
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| 204 | $date =~ s/^(\d\d\d\d).*$/$1/g;
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| 205 | }
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| 206 | # create subclass if it doesn't already exist
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| 207 | $classhash->{$year} = () unless defined $classhash->{$year};
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| 208 | $classhash->{$year}->{$month} = []
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| 209 | unless defined $classhash->{$year}->{$month};
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| 210 | push (@{$classhash->{$year}->{$month}}, $classification);
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| 211 | }
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| 212 | # create hlist of years containing hlists of months
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| 213 |
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| 214 | foreach my $subclass (sort {$a <=> $b} keys %$classhash) {
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| 215 | my $yearclassify = $self->get_entry($subclass, "HList");
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| 216 | foreach my $subsubclass (sort {$a <=> $b}
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| 217 | (keys %{$classhash->{$subclass}})) {
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| 218 | my $monthname=$subsubclass;
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| 219 | if ($monthname >= 1 && $monthname <= 12) {
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| 220 | $monthname="_textmonth" . $monthname . "_";
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| 221 | }
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| 222 | my $monthclassify=$self->get_entry($monthname, "DateList");
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| 223 | push (@{$yearclassify->{'contains'}}, $monthclassify);
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| 224 |
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| 225 | foreach $subsubOID
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| 226 | (@{$classhash->{$subclass}->{$subsubclass}}) {
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| 227 | push (@{$monthclassify->{'contains'}},
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| 228 | {'OID'=>$subsubOID});
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| 229 | }
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| 230 | }
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| 231 | push (@{$classifyinfo->{'contains'}}, $yearclassify);
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| 232 | }
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| 233 | return $classifyinfo;
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| 234 | } # nogroup
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| 235 | } else {
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| 236 | # not by month
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| 237 | # first split up the list into separate year classifications
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| 238 | foreach $classification (@$classlistref) {
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| 239 | my $date = $self->{'list'}->{$classification};
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| 240 | $date =~ s/^(\d\d\d\d).*$/$1/;
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| 241 | $classhash->{$date} = [] unless defined $classhash->{$date};
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| 242 | push (@{$classhash->{$date}}, $classification);
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| 243 | }
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| 244 | }
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| 245 |
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| 246 | # only compact the list if nogroup not specified
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| 247 | if (!$self->{'nogroup'}) {
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| 248 | $classhash = $self->compactlist ($classhash);
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| 249 | }
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| 250 | foreach $subclass (sort keys %$classhash) {
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| 251 | my $tempclassify = $self->get_entry($subclass, "DateList");
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| 252 | foreach $subsubOID (@{$classhash->{$subclass}}) {
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| 253 | push (@{$tempclassify->{'contains'}}, {'OID'=>$subsubOID});
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| 254 | }
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| 255 | push (@{$classifyinfo->{'contains'}}, $tempclassify);
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| 256 | }
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| 257 |
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| 258 | return $classifyinfo;
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| 259 | }
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| 260 |
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| 261 | sub compactlist {
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| 262 | my $self = shift (@_);
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| 263 | my ($classhashref) = @_;
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| 264 | my $compactedhash = {};
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| 265 | my @currentOIDs = ();
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| 266 | my $currentfirstdate = "";
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| 267 | my $currentlastdate = "";
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| 268 | my $lastkey = "";
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| 269 |
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| 270 | # minimum and maximum documents to be displayed per page.
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| 271 | # the actual maximum will be max + (min-1).
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| 272 | # the smallest sub-section is a single letter at present
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| 273 | # so in this case there may be many times max documents
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| 274 | # displayed on a page.
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| 275 | my $min = 10;
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| 276 | my $max = 30;
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| 277 | foreach my $subsection (sort keys %$classhashref) {
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| 278 | $currentfirstdate = $subsection if $currentfirstdate eq "";
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| 279 | if ((scalar (@currentOIDs) < $min) ||
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| 280 | ((scalar (@currentOIDs) + scalar (@{$classhashref->{$subsection}})) <= $max)) {
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| 281 | push (@currentOIDs, @{$classhashref->{$subsection}});
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| 282 | $currentlastdate = $subsection;
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| 283 | } else {
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| 284 |
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| 285 | if ($currentfirstdate eq $currentlastdate) {
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| 286 | @{$compactedhash->{$currentfirstdate}} = @currentOIDs;
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| 287 | $lastkey = $currentfirstdate;
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| 288 | } else {
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| 289 | @{$compactedhash->{"$currentfirstdate-$currentlastdate"}} = @currentOIDs;
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| 290 | $lastkey = "$currentfirstdate-$currentlastdate";
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| 291 | }
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| 292 | if (scalar (@{$classhashref->{$subsection}}) >= $max) {
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| 293 | $compactedhash->{$subsection} = $classhashref->{$subsection};
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| 294 | @currentOIDs = ();
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| 295 | $currentfirstdate = "";
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| 296 | $lastkey = $subsection;
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| 297 | } else {
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| 298 | @currentOIDs = @{$classhashref->{$subsection}};
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| 299 | $currentfirstdate = $subsection;
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| 300 | $currentlastdate = $subsection;
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| 301 | }
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| 302 | }
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| 303 | }
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| 304 |
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| 305 | # add final OIDs to last sub-classification if there aren't many otherwise
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| 306 | # add final sub-classification
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| 307 | if ((scalar (@currentOIDs) < $min) && (scalar (@currentOIDs) > 0)) {
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| 308 | # want every thing in previous up to the dash
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| 309 | my ($newkey) = $lastkey =~ /^([^\-]+)/;
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| 310 | @currentOIDs = (@{$compactedhash->{$lastkey}}, @currentOIDs);
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| 311 | delete $compactedhash->{$lastkey};
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| 312 | @{$compactedhash->{"$newkey-$currentlastdate"}} = @currentOIDs;
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| 313 | } else {
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| 314 | if ($currentfirstdate eq $currentlastdate) {
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| 315 | @{$compactedhash->{$currentfirstdate}} = @currentOIDs;
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| 316 | } else {
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| 317 | @{$compactedhash->{"$currentfirstdate-$currentlastdate"}} = @currentOIDs;
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| 318 | }
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| 319 | }
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| 320 |
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| 321 | return $compactedhash;
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| 322 | }
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| 323 |
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| 324 | 1;
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