| 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 BaseClassifier;
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| 43 | use sorttools;
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| 44 |
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| 45 | use strict;
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| 46 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 47 |
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| 48 | sub BEGIN {
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| 49 | @DateList::ISA = ('BaseClassifier');
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| 50 | }
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| 51 |
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| 52 | my $arguments =
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| 53 | [ { 'name' => "metadata",
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| 54 | 'desc' => "{DateList.metadata}",
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| 55 | 'type' => "metadata",
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| 56 | 'deft' => "Date",
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| 57 | 'reqd' => "yes" } ,
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| 58 | { 'name' => "sort",
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| 59 | 'desc' => "{DateList.sort}",
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| 60 | 'type' => "metadata",
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| 61 | 'reqd' => "no" } ,
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| 62 | { 'name' => "reverse_sort",
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| 63 | 'desc' => "{DateList.reverse_sort}",
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| 64 | 'type' => "flag",
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| 65 | 'reqd' => "no" },
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| 66 | { 'name' => "bymonth",
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| 67 | 'desc' => "{DateList.bymonth}",
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| 68 | 'type' => "flag",
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| 69 | 'reqd' => "no" },
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| 70 | { 'name' => "nogroup",
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| 71 | 'desc' => "{DateList.nogroup}",
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| 72 | 'type' => "flag",
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| 73 | 'reqd' => "no" },
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| 74 | { 'name' => "no_special_formatting",
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| 75 | 'desc' => "{DateList.no_special_formatting}",
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| 76 | 'type' => "flag",
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| 77 | 'reqd' => "no" }
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| 78 |
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| 79 | ];
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| 80 |
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| 81 | my $options = { 'name' => "DateList",
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| 82 | 'desc' => "{DateList.desc}",
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| 83 | 'abstract' => "no",
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| 84 | 'inherits' => "yes",
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| 85 | 'args' => $arguments };
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| 86 |
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| 87 |
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| 88 | sub new {
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| 89 | my ($class) = shift (@_);
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| 90 | my ($classifierslist,$inputargs,$hashArgOptLists) = @_;
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| 91 | push(@$classifierslist, $class);
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| 92 |
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| 93 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 94 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 95 |
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| 96 | my $self = new BaseClassifier($classifierslist, $inputargs, $hashArgOptLists);
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| 97 |
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| 98 | if ($self->{'info_only'}) {
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| 99 | # don't worry about any options etc
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| 100 | return bless $self, $class;
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| 101 | }
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| 102 |
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| 103 | # Manually set $self parameters.
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| 104 | $self->{'list'} = {};
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| 105 |
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| 106 | if (!defined $self->{"metadata"} || $self->{"metadata"} eq "") {
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| 107 | $self->{'metadata'} = "Date";
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| 108 | }
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| 109 | # remove any ex.s
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| 110 | $self->{'metadata'} = $self->strip_ex_from_metadata($self->{'metadata'});
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| 111 | $self->{'sort'} = $self->strip_ex_from_metadata($self->{'sort'});
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| 112 |
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| 113 | # now can have comma separated list of Dates - we just use the first one (for now)
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| 114 | my @meta_list = split(/,/, $self->{"metadata"});
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| 115 | $self->{'meta_list'} = \@meta_list;
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| 116 |
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| 117 | $self->{'buttonname'} = $self->generate_title_from_metadata($self->{'metadata'}) unless ($self->{'buttonname'});
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| 118 |
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| 119 | $self->{'childtype'} = "DateList";
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| 120 | if ($self->{'no_special_formatting'}) {
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| 121 | $self->{'childtype'} = "VList";
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| 122 | }
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| 123 |
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| 124 | return bless $self, $class;
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| 125 | }
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| 126 |
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| 127 | sub init {
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| 128 | my $self = shift (@_);
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| 129 |
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| 130 | $self->{'list'} = {};
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| 131 | }
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| 132 |
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| 133 | sub classify {
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| 134 | my $self = shift (@_);
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| 135 | my ($doc_obj, $edit_mode) = @_;
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| 136 |
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| 137 | my $doc_OID = $doc_obj->get_OID();
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| 138 |
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| 139 | # find the first available metadata
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| 140 | my $date;
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| 141 | foreach my $m (@{$self->{'meta_list'}}) {
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| 142 | $date = $doc_obj->get_metadata_element($doc_obj->get_top_section(), $m);
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| 143 | last if defined $date;
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| 144 | }
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| 145 |
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| 146 | #my $date = $doc_obj->get_metadata_element ($doc_obj->get_top_section(), $self->{'metadata'});
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| 147 | if (!defined $date || $date eq "") {
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| 148 | # if this document doesn't contain Date element we won't
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| 149 | # include it in this classification
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| 150 | return;
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| 151 | }
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| 152 |
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| 153 | if (($edit_mode eq "delete") || ($edit_mode eq "update")) {
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| 154 | $self->oid_hash_delete($doc_OID,'list');
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| 155 | return if ($edit_mode eq "delete");
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| 156 | }
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| 157 |
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| 158 | my $sort_other = "";
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| 159 | if (defined $self->{'sort'} && $self->{'sort'} ne "") {
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| 160 | $sort_other = $doc_obj->get_metadata_element ($doc_obj->get_top_section(), $self->{'sort'});
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| 161 | $sort_other = &sorttools::format_metadata_for_sorting($self->{'sort'}, $sort_other, $doc_obj) unless $self->{'no_metadata_formatting'};
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| 162 | }
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| 163 |
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| 164 | if (defined $self->{'list'}->{$doc_OID}) {
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| 165 | my $outhandle = $self->{'outhandle'};
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| 166 | print $outhandle "WARNING: DateList::classify called multiple times for $doc_OID\n";
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| 167 | }
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| 168 |
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| 169 |
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| 170 | $self->{'list'}->{$doc_OID} = "$date$sort_other";
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| 171 |
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| 172 | }
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| 173 |
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| 174 |
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| 175 | sub get_classify_info {
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| 176 | my $self = shift (@_);
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| 177 |
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| 178 | my @classlist = sort {$self->{'list'}->{$a} cmp $self->{'list'}->{$b};} keys %{$self->{'list'}};
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| 179 |
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| 180 | if ($self->{'reverse_sort'}) {
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| 181 | @classlist = reverse @classlist;
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| 182 | }
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| 183 |
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| 184 |
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| 185 | return $self->splitlist (\@classlist);
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| 186 | }
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| 187 |
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| 188 |
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| 189 | sub get_entry {
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| 190 | my $self = shift (@_);
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| 191 | my ($title, $childtype, $thistype) = @_;
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| 192 |
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| 193 | # organise into classification structure
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| 194 | my %classifyinfo = ('childtype'=>$childtype,
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| 195 | 'Title'=>$title,
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| 196 | 'contains'=>[],
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| 197 | 'mdtype'=>$self->{'metadata'});
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| 198 | $classifyinfo{'thistype'} = $thistype
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| 199 | if defined $thistype && $thistype =~ /\w/;
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| 200 |
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| 201 | return \%classifyinfo;
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| 202 | }
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| 203 |
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| 204 | # splitlist takes an ordered list of classifications (@$classlistref) and
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| 205 | # splits it up into sub-sections by date
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| 206 | sub splitlist {
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| 207 | my $self = shift (@_);
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| 208 | my ($classlistref) = @_;
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| 209 | my $classhash = {};
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| 210 |
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| 211 | # top level
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| 212 | my $childtype = "HList";
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| 213 |
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| 214 | if (scalar (@$classlistref) <= 39 &&
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| 215 | !$self->{'nogroup'}) {$childtype = $self->{'childtype'};}
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| 216 |
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| 217 | my $classifyinfo = $self->get_entry ($self->{'buttonname'}, $childtype, "Invisible");
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| 218 | # don't need to do any splitting if there are less than 39 (max + min -1)
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| 219 | # classifications, unless nogroup is specified
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| 220 | if ((scalar @$classlistref) <= 39 && !$self->{'nogroup'}) {
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| 221 | foreach my $subOID (@$classlistref) {
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| 222 | push (@{$classifyinfo->{'contains'}}, {'OID'=>$subOID});
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| 223 | }
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| 224 | return $classifyinfo;
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| 225 | }
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| 226 |
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| 227 |
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| 228 | if ($self->{'bymonth'}) {
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| 229 | # first split up the list into separate year+month classifications
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| 230 |
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| 231 | if (!$self->{'nogroup'}) { # hlist of year+month pairs
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| 232 | # single level of classifications
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| 233 | foreach my $classification (@$classlistref) {
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| 234 | my $date = $self->{'list'}->{$classification};
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| 235 | $date =~ s/^(\d\d\d\d)-?(\d\d).*$/$1 _textmonth$2_/;
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| 236 | # sanity check if month is zero
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| 237 | if ($date =~ /00_$/) {
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| 238 | $date =~ s/^(\d\d\d\d).*$/$1/g;
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| 239 | }
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| 240 | $classhash->{$date} = [] unless defined $classhash->{$date};
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| 241 | push (@{$classhash->{$date}}, $classification);
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| 242 | }
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| 243 |
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| 244 | } else { # don't group - individual years and months
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| 245 | foreach my $classification (@$classlistref) {
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| 246 | my $date = $self->{'list'}->{$classification};
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| 247 | $date =~ s/^(\d\d\d\d)-?(\d\d).*$/$1 _textmonth$2_/;
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| 248 | my ($year, $month)=($1,$2);
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| 249 | # sanity check if month is zero
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| 250 | if ($date =~ /00_$/) {
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| 251 | $date =~ s/^(\d\d\d\d).*$/$1/g;
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| 252 | }
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| 253 | # create subclass if it doesn't already exist
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| 254 | $classhash->{$year} = () unless defined $classhash->{$year};
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| 255 |
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| 256 | $classhash->{$year}->{$month} = []
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| 257 | unless defined $classhash->{$year}->{$month};
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| 258 | push (@{$classhash->{$year}->{$month}}, $classification);
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| 259 |
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| 260 | }
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| 261 | # create hlist of years containing hlists of months
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| 262 |
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| 263 |
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| 264 | if ($self->{'reverse_sort'}){
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| 265 | foreach my $subclass (sort {$b <=> $a}
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| 266 | (keys %$classhash)){
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| 267 | my $yearclassify = $self->get_entry($subclass, "HList");
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| 268 | foreach my $subsubclass (sort {$b <=> $a}
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| 269 | (keys %{$classhash->{$subclass}})) {
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| 270 | my $monthname=$subsubclass;
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| 271 | if ($monthname >= 1 && $monthname <= 12) {
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| 272 | $monthname="_textmonth" . $monthname . "_";
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| 273 | }
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| 274 | my $monthclassify=$self->get_entry($monthname, $self->{'childtype'});
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| 275 | push (@{$yearclassify->{'contains'}}, $monthclassify);
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| 276 |
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| 277 | foreach my $subsubOID
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| 278 | (@{$classhash->{$subclass}->{$subsubclass}}) {
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| 279 | push (@{$monthclassify->{'contains'}},
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| 280 | {'OID'=>$subsubOID});
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| 281 | }
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| 282 | }
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| 283 | push (@{$classifyinfo->{'contains'}}, $yearclassify);
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| 284 | }
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| 285 | }
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| 286 | else{
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| 287 | foreach my $subclass (sort {$a <=> $b}
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| 288 | (keys %$classhash)){
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| 289 | my $yearclassify = $self->get_entry($subclass, "HList");
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| 290 | foreach my $subsubclass (sort {$a <=> $b}
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| 291 | (keys %{$classhash->{$subclass}})) {
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| 292 | my $monthname=$subsubclass;
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| 293 | if ($monthname >= 1 && $monthname <= 12) {
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| 294 | $monthname="_textmonth" . $monthname . "_";
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| 295 | }
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| 296 | my $monthclassify=$self->get_entry($monthname, $self->{'childtype'});
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| 297 | push (@{$yearclassify->{'contains'}}, $monthclassify);
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| 298 |
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| 299 | foreach my $subsubOID
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| 300 | (@{$classhash->{$subclass}->{$subsubclass}}) {
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| 301 | push (@{$monthclassify->{'contains'}},
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| 302 | {'OID'=>$subsubOID});
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| 303 | }
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| 304 | }
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| 305 | push (@{$classifyinfo->{'contains'}}, $yearclassify);
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| 306 | }
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| 307 |
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| 308 |
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| 309 | }
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| 310 |
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| 311 | return $classifyinfo;
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| 312 | } # nogroup
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| 313 | }else {
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| 314 | # not by month
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| 315 | # first split up the list into separate year classifications
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| 316 | foreach my $classification (@$classlistref) {
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| 317 | my $date = $self->{'list'}->{$classification};
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| 318 | $date =~ s/^(\d\d\d\d).*$/$1/;
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| 319 | $classhash->{$date} = [] unless defined $classhash->{$date};
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| 320 | push (@{$classhash->{$date}}, $classification);
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| 321 | }
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| 322 |
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| 323 | }
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| 324 |
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| 325 | # only compact the list if nogroup not specified
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| 326 | if (!$self->{'nogroup'}) {
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| 327 | $classhash = $self->compactlist ($classhash);
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| 328 | }
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| 329 |
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| 330 | if ($self->{'reverse_sort'} && $self->{'nogroup'} ) {
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| 331 | foreach my $subclass (reverse sort keys %$classhash) {
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| 332 | my $tempclassify = $self->get_entry($subclass, $self->{'childtype'});
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| 333 | foreach my $subsubOID (@{$classhash->{$subclass}}) {
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| 334 | push (@{$tempclassify->{'contains'}}, {'OID'=>$subsubOID});
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| 335 | }
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| 336 | push (@{$classifyinfo->{'contains'}}, $tempclassify);
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| 337 | }
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| 338 | }
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| 339 | else{
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| 340 | foreach my $subclass (sort keys %$classhash) {
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| 341 | my $tempclassify = $self->get_entry($subclass, $self->{'childtype'});
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| 342 | foreach my $subsubOID (@{$classhash->{$subclass}}) {
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| 343 | push (@{$tempclassify->{'contains'}}, {'OID'=>$subsubOID});
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| 344 | }
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| 345 | push (@{$classifyinfo->{'contains'}}, $tempclassify);
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| 346 | }
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| 347 |
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| 348 | }
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| 349 |
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| 350 |
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| 351 | return $classifyinfo;
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| 352 | }
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| 353 |
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| 354 | sub compactlist {
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| 355 | my $self = shift (@_);
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| 356 | my ($classhashref) = @_;
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| 357 | my $compactedhash = {};
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| 358 | my @currentOIDs = ();
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| 359 | my $currentfirstdate = "";
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| 360 | my $currentlastdate = "";
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| 361 | my $lastkey = "";
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| 362 |
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| 363 | # minimum and maximum documents to be displayed per page.
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| 364 | # the actual maximum will be max + (min-1).
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| 365 | # the smallest sub-section is a single letter at present
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| 366 | # so in this case there may be many times max documents
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| 367 | # displayed on a page.
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| 368 | my $min = 10;
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| 369 | my $max = 30;
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| 370 | foreach my $subsection (sort keys %$classhashref) {
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| 371 | $currentfirstdate = $subsection if $currentfirstdate eq "";
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| 372 | if ((scalar (@currentOIDs) < $min) ||
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| 373 | ((scalar (@currentOIDs) + scalar (@{$classhashref->{$subsection}})) <= $max)) {
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| 374 | push (@currentOIDs, @{$classhashref->{$subsection}});
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| 375 | $currentlastdate = $subsection;
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| 376 | } else {
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| 377 | if ($currentfirstdate eq $currentlastdate) {
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| 378 | @{$compactedhash->{$currentfirstdate}} = @currentOIDs;
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| 379 | $lastkey = $currentfirstdate;
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| 380 | } else {
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| 381 | @{$compactedhash->{"$currentfirstdate-$currentlastdate"}} = @currentOIDs;
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| 382 | $lastkey = "$currentfirstdate-$currentlastdate";
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| 383 | }
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| 384 | if (scalar (@{$classhashref->{$subsection}}) >= $max) {
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| 385 | $compactedhash->{$subsection} = $classhashref->{$subsection};
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| 386 | @currentOIDs = ();
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| 387 | $currentfirstdate = "";
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| 388 | $lastkey = $subsection;
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| 389 | } else {
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| 390 | @currentOIDs = @{$classhashref->{$subsection}};
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| 391 | $currentfirstdate = $subsection;
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| 392 | $currentlastdate = $subsection;
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| 393 | }
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| 394 | }
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| 395 | }
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| 396 |
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| 397 | # add final OIDs to last sub-classification if there aren't many otherwise
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| 398 | # add final sub-classification
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| 399 | if (scalar (@currentOIDs) > 0) {
|
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| 400 | if ((scalar (@currentOIDs) < $min)) {
|
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| 401 |
|
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| 402 | # want every thing in previous up to the dash
|
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| 403 | my ($newkey) = $lastkey =~ /^([^\-]+)/;
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| 404 | @currentOIDs = (@{$compactedhash->{$lastkey}}, @currentOIDs);
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| 405 | delete $compactedhash->{$lastkey};
|
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| 406 | @{$compactedhash->{"$newkey-$currentlastdate"}} = @currentOIDs;
|
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| 407 | } else {
|
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| 408 | if ($currentfirstdate eq $currentlastdate) {
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| 409 | @{$compactedhash->{$currentfirstdate}} = @currentOIDs;
|
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| 410 | } else {
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| 411 | @{$compactedhash->{"$currentfirstdate-$currentlastdate"}} = @currentOIDs;
|
|---|
| 412 | }
|
|---|
| 413 | }
|
|---|
| 414 | }
|
|---|
| 415 |
|
|---|
| 416 | return $compactedhash;
|
|---|
| 417 | }
|
|---|
| 418 |
|
|---|
| 419 | 1;
|
|---|
