| 1 | ###########################################################################
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| 2 | #
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| 3 | # AZList.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 alphabetically
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| 27 |
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| 28 | package AZList;
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| 29 |
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| 30 | use BaseClassifier;
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| 31 | use sorttools;
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| 32 |
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| 33 | use strict;
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| 34 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 35 |
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| 36 | sub BEGIN {
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| 37 | @AZList::ISA = ('BaseClassifier');
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| 38 | }
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| 39 |
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| 40 |
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| 41 | my $arguments =
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| 42 | [ { 'name' => "metadata",
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| 43 | 'desc' => "{AZList.metadata}",
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| 44 | 'type' => "metadata",
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| 45 | 'reqd' => "yes" } ,
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| 46 | { 'name' => "removeprefix",
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| 47 | 'desc' => "{BasClas.removeprefix}",
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| 48 | 'type' => "regexp",
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| 49 | 'deft' => "",
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| 50 | 'reqd' => "no" } ,
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| 51 | { 'name' => "removesuffix",
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| 52 | 'desc' => "{BasClas.removesuffix}",
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| 53 | 'type' => "regexp",
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| 54 | 'deft' => "",
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| 55 | 'reqd' => "no" }
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| 56 | ];
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| 57 |
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| 58 | my $options = { 'name' => "AZList",
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| 59 | 'desc' => "{AZList.desc}",
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| 60 | 'abstract' => "no",
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| 61 | 'inherits' => "yes",
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| 62 | 'args' => $arguments };
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| 63 |
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| 64 |
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| 65 | sub new {
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| 66 | my ($class) = shift (@_);
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| 67 | my ($classifierslist,$inputargs,$hashArgOptLists) = @_;
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| 68 | push(@$classifierslist, $class);
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| 69 |
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| 70 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 71 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 72 |
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| 73 | my $self = new BaseClassifier($classifierslist, $inputargs, $hashArgOptLists);
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| 74 |
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| 75 | if ($self->{'info_only'}) {
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| 76 | # don't worry about any options etc
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| 77 | return bless $self, $class;
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| 78 | }
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| 79 |
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| 80 | if (!$self->{"metadata"}) {
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| 81 | print STDERR "AZList Error: required option -metadata not supplied \n";
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| 82 | $self->print_txt_usage(""); # Use default resource bundle
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| 83 |
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| 84 | die "AZList Error: required option -metadata not supplied\n";
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| 85 | }
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| 86 |
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| 87 | # Manually set $self parameters.
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| 88 | $self->{'list'} = {};
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| 89 |
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| 90 | # Transfer value from Auto Parsing to the variable name that used in previous GreenStone.
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| 91 | my @meta_list = split(/,/, $self->{"metadata"});
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| 92 | $self->{'meta_list'} = \@meta_list;
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| 93 |
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| 94 | $self->{'buttonname'} = $self->generate_title_from_metadata($self->{'metadata'}) unless ($self->{'buttonname'});
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| 95 |
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| 96 | # Further setup
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| 97 | if (defined($self->{"removeprefix"}) && $self->{"removeprefix"}) {
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| 98 | $self->{"removeprefix"} =~ s/^\^//; # don't need a leading ^
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| 99 | }
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| 100 | if (defined($self->{"removesuffix"}) && $self->{"removesuffix"}) {
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| 101 | $self->{"removesuffix"} =~ s/\$$//; # don't need a trailing $
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| 102 | }
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| 103 |
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| 104 | # Clean out the unused keys
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| 105 | delete $self->{"metadata"}; # Delete this key
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| 106 |
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| 107 | if($self->{"removeprefix"} eq "") {delete $self->{"removeprefix"};}
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| 108 | if($self->{"removesuffix"} eq "") {delete $self->{"removesuffix"};}
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| 109 |
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| 110 | return bless $self, $class;
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| 111 | }
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| 112 |
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| 113 | sub init {
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| 114 | my $self = shift (@_);
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| 115 |
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| 116 | $self->{'list'} = {};
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| 117 | }
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| 118 |
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| 119 | sub classify {
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| 120 | my $self = shift (@_);
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| 121 | my ($doc_obj) = @_;
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| 122 |
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| 123 | my $doc_OID = $doc_obj->get_OID();
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| 124 | my $outhandle = $self->{'outhandle'};
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| 125 |
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| 126 | my $metavalue;
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| 127 | my $metaname;
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| 128 | # should we extend this to use all available metadata not just the first?
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| 129 | if (!defined $self->{'meta_list'}) {
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| 130 | # just in case
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| 131 | return;
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| 132 | }
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| 133 |
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| 134 | # find the first available metadata
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| 135 | foreach my $m (@{$self->{'meta_list'}}) {
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| 136 | $metavalue = $doc_obj->get_metadata_element($doc_obj->get_top_section(), $m);
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| 137 | $metaname = $m;
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| 138 | last if defined $metavalue;
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| 139 | }
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| 140 |
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| 141 | #if we haven't found a metavalue here, then the doc shouldn't be included
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| 142 | if (!defined $metavalue || $metavalue eq "") {
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| 143 | print $outhandle "WARNING: AZList: $doc_OID metadata is empty - not classifying\n";
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| 144 | return;
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| 145 | }
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| 146 |
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| 147 | if (defined($self->{'removeprefix'}) &&
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| 148 | length($self->{'removeprefix'})) {
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| 149 | $metavalue =~ s/^$self->{'removeprefix'}//;
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| 150 | }
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| 151 | if (defined($self->{'removesuffix'}) &&
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| 152 | length($self->{'removesuffix'})) {
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| 153 | $metavalue =~ s/$self->{'removesuffix'}$//;
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| 154 | }
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| 155 |
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| 156 |
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| 157 | $metavalue = &sorttools::format_metadata_for_sorting($metaname, $metavalue, $doc_obj) unless $self->{'no_metadata_formatting'};
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| 158 |
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| 159 | if (defined $self->{'list'}->{$doc_OID}) {
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| 160 | print $outhandle "WARNING: AZList::classify called multiple times for $doc_OID\n";
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| 161 | }
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| 162 | if ($metavalue) {
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| 163 | $self->{'list'}->{$doc_OID} = $metavalue;
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| 164 | } else {
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| 165 | # the formatting has made it empty
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| 166 | my $outhandle = $self->{'outhandle'};
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| 167 | print $outhandle "WARNING: AZList: $doc_OID metadata has become empty - not classifying\n";
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| 168 | }
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| 169 |
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| 170 | }
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| 171 |
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| 172 | sub alpha_numeric_cmp
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| 173 | {
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| 174 | my ($self,$a,$b) = @_;
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| 175 |
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| 176 | my $title_a = $self->{'list'}->{$a};
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| 177 | my $title_b = $self->{'list'}->{$b};
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| 178 |
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| 179 | if ($title_a =~ m/^(\d+(\.\d+)?)/)
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| 180 | {
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| 181 | my $val_a = $1;
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| 182 | if ($title_b =~ m/^(\d+(\.\d+)?)/)
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| 183 | {
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| 184 | my $val_b = $1;
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| 185 | if ($val_a != $val_b)
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| 186 | {
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| 187 | return ($val_a <=> $val_b);
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| 188 | }
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| 189 | }
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| 190 | }
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| 191 |
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| 192 | return ($title_a cmp $title_b);
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| 193 | }
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| 194 |
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| 195 | sub get_classify_info {
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| 196 | my $self = shift (@_);
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| 197 |
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| 198 | my @classlist
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| 199 | = sort { $self->alpha_numeric_cmp($a,$b) } keys %{$self->{'list'}};
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| 200 |
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| 201 | return $self->splitlist (\@classlist);
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| 202 | }
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| 203 |
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| 204 | sub get_entry {
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| 205 | my $self = shift (@_);
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| 206 | my ($title, $childtype, $thistype) = @_;
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| 207 |
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| 208 | # organise into classification structure
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| 209 | my %classifyinfo = ('childtype'=>$childtype,
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| 210 | 'Title'=>$title,
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| 211 | 'contains'=>[]);
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| 212 | $classifyinfo{'thistype'} = $thistype
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| 213 | if defined $thistype && $thistype =~ /\w/;
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| 214 |
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| 215 | return \%classifyinfo;
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| 216 | }
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| 217 |
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| 218 | # splitlist takes an ordered list of classifications (@$classlistref) and splits it
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| 219 | # up into alphabetical sub-sections.
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| 220 | sub splitlist {
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| 221 | my $self = shift (@_);
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| 222 | my ($classlistref) = @_;
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| 223 | my $classhash = {};
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| 224 |
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| 225 | # top level
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| 226 | my $childtype = "HList";
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| 227 | if (scalar (@$classlistref) <= 39) {$childtype = "VList";}
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| 228 | my $classifyinfo = $self->get_entry ($self->{'buttonname'}, $childtype, "Invisible");
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| 229 |
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| 230 | # don't need to do any splitting if there are less than 39 (max + min -1) classifications
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| 231 | if ((scalar @$classlistref) <= 39) {
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| 232 | foreach my $subOID (@$classlistref) {
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| 233 | push (@{$classifyinfo->{'contains'}}, {'OID'=>$subOID});
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| 234 | }
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| 235 | return $classifyinfo;
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| 236 | }
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| 237 |
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| 238 | # first split up the list into separate A-Z and 0-9 classifications
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| 239 | foreach my $classification (@$classlistref) {
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| 240 | my $title = $self->{'list'}->{$classification};
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| 241 |
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| 242 | $title =~ s/^(&.{1,6};|<[^>]>|[^a-zA-Z0-9])//g; # remove any unwanted stuff
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| 243 | # only need first char for classification
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| 244 | $title =~ m/^(.)/; $title=$1;
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| 245 | $title =~ tr/[a-z]/[A-Z]/;
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| 246 | if ($title =~ /^[0-9]$/) {$title = '0-9';}
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| 247 | elsif ($title !~ /^[A-Z]$/) {
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| 248 | my $outhandle = $self->{'outhandle'};
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| 249 | print $outhandle "AZList: WARNING $classification has badly formatted title ($title)\n";
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| 250 | }
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| 251 | $classhash->{$title} = [] unless defined $classhash->{$title};
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| 252 | push (@{$classhash->{$title}}, $classification);
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| 253 | }
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| 254 | $classhash = $self->compactlist ($classhash);
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| 255 |
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| 256 | my @tmparr = ();
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| 257 | foreach my $subsection (sort keys (%$classhash)) {
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| 258 | push (@tmparr, $subsection);
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| 259 | }
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| 260 | #if there is only one entry here, we suppress the buckets
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| 261 | if ((scalar @tmparr) == 1) {
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| 262 | $classifyinfo->{'childtype'} = "VList";
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| 263 | foreach my $OID (@{$classhash->{$tmparr[0]}}) {
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| 264 | push (@{$classifyinfo->{'contains'}}, {'OID'=>$OID});
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| 265 | }
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| 266 | return $classifyinfo;
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| 267 | }
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| 268 |
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| 269 | # if there's a 0-9 section it will have been sorted to the beginning
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| 270 | # but we want it at the end
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| 271 | if ($tmparr[0] eq '0-9') {
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| 272 | shift @tmparr;
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| 273 | push (@tmparr, '0-9');
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| 274 | }
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| 275 |
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| 276 | foreach my $subclass (@tmparr) {
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| 277 | my $tempclassify = $self->get_entry($subclass, "VList");
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| 278 | foreach my $subsubOID (@{$classhash->{$subclass}}) {
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| 279 | push (@{$tempclassify->{'contains'}}, {'OID'=>$subsubOID});
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| 280 | }
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| 281 | push (@{$classifyinfo->{'contains'}}, $tempclassify);
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| 282 | }
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| 283 |
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| 284 | return $classifyinfo;
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| 285 | }
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| 286 |
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| 287 | sub compactlist {
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| 288 | my $self = shift (@_);
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| 289 | my ($classhashref) = @_;
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| 290 | my $compactedhash = {};
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| 291 | my @currentOIDs = ();
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| 292 | my $currentfirstletter = ""; # start of working bin
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| 293 | my $currentlastletter = ""; # end of working bin
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| 294 | my $lastkey = ""; # the name of the last completed key
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| 295 |
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| 296 | # minimum and maximum documents to be displayed per page.
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| 297 | # the actual maximum will be max + (min-1).
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| 298 | # the smallest sub-section is a single letter at present
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| 299 | # so in this case there may be many times max documents
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| 300 | # displayed on a page.
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| 301 | my $min = 10;
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| 302 | my $max = 30;
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| 303 |
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| 304 | foreach my $subsection (sort keys %$classhashref) {
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| 305 | if ($subsection eq '0-9') {
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| 306 | # leave this bin as-is... copy it straight across
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| 307 | @{$compactedhash->{$subsection}} = @{$classhashref->{$subsection}};
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| 308 | next;
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| 309 | }
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| 310 | $currentfirstletter = $subsection if $currentfirstletter eq "";
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| 311 | if ((scalar (@currentOIDs) < $min) ||
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| 312 | ((scalar (@currentOIDs) + scalar (@{$classhashref->{$subsection}})) <= $max)) {
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| 313 | # add this letter to the bin and continue
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| 314 | push (@currentOIDs, @{$classhashref->{$subsection}});
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| 315 | $currentlastletter = $subsection;
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| 316 | } else {
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| 317 | # too many or too few for a separate bin
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| 318 | if ($currentfirstletter eq $currentlastletter) {
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| 319 | @{$compactedhash->{$currentfirstletter}} = @currentOIDs;
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| 320 | $lastkey = $currentfirstletter;
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| 321 | } else {
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| 322 | @{$compactedhash->{"$currentfirstletter-$currentlastletter"}} = @currentOIDs;
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| 323 | $lastkey = "$currentfirstletter-$currentlastletter";
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| 324 | }
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| 325 | if (scalar (@{$classhashref->{$subsection}}) >= $max) {
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| 326 | # this key is now complete. Start a new one
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| 327 | $compactedhash->{$subsection} = $classhashref->{$subsection};
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| 328 | @currentOIDs = ();
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| 329 | $currentfirstletter = "";
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| 330 | $lastkey = $subsection;
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| 331 | } else {
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| 332 | @currentOIDs = @{$classhashref->{$subsection}};
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| 333 | $currentfirstletter = $subsection;
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| 334 | $currentlastletter = $subsection;
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| 335 | }
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| 336 | }
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| 337 | }
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| 338 |
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| 339 | # add final OIDs to last sub-classification if there aren't many otherwise
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| 340 | # add final sub-classification
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| 341 | # BUG FIX: don't add anything if there are no currentOIDs (thanks to Don Gourley)
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| 342 | if (! scalar(@currentOIDs)) {return $compactedhash;}
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| 343 |
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| 344 | if (scalar (@currentOIDs) < $min) {
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| 345 | my ($newkey) = $lastkey =~ /^(.)/;
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| 346 | @currentOIDs = (@{$compactedhash->{$lastkey}}, @currentOIDs);
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| 347 | delete $compactedhash->{$lastkey};
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| 348 | @{$compactedhash->{"$newkey-$currentlastletter"}} = @currentOIDs;
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| 349 | } else {
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| 350 | if ($currentfirstletter eq $currentlastletter) {
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| 351 | @{$compactedhash->{$currentfirstletter}} = @currentOIDs;
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| 352 | }
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| 353 | else {
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| 354 | @{$compactedhash->{"$currentfirstletter-$currentlastletter"}} =
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| 355 | @currentOIDs;
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| 356 | }
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| 357 | }
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| 358 |
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| 359 | return $compactedhash;
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| 360 | }
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| 361 |
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| 362 | 1;
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