1 | ###########################################################################
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2 | #
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3 | # IndexPlug.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 | # This recursive plugin processes an index.txt file.
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27 | # The index.txt file should contain the list of files to be
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28 | # included in the collection followed by any extra metadata to
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29 | # be associated with each file.
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30 |
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31 | # The index.txt file should be formatted as follows:
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32 | # The first line may be a key (beginning with key:)
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33 | # to name the metadata fields
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34 | # (e.g. key: Subject Organization Date)
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35 | # The following lines will contain a filename followed
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36 | # by the value that metadata entry is to be set to.
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37 | # (e.g. 'irma/iw097e 3.2 unesco 1993' will associate the
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38 | # metadata Subject=3.2, Organization=unesco, and Date=1993
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39 | # with the file irma/iw097e if the above key line was used)
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40 |
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41 | # Note that if any of the metadata fields use the Hierarchy
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42 | # classifier plugin then the value they're set to should
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43 | # correspond to the first field (the descriptor) in the
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44 | # appropriate classification file.
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45 |
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46 | # Metadata values may be named separately using a tag
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47 | # (e.g. <Subject>3.2) and this will override any name
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48 | # given to them by the key line.
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49 | # If there's no key line any unnamed metadata value will be
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50 | # named 'Subject'.
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51 |
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52 | # 12/05/02 Added usage datastructure - John Thompson
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53 |
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54 | package IndexPlug;
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55 |
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56 | use plugin;
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57 | use BasPlug;
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58 | use doc;
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59 | use util;
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60 | use cfgread;
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61 |
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62 | sub BEGIN {
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63 | @ISA = ('BasPlug');
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64 | }
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65 |
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66 | my $options = { 'name' => "IndexPlug",
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67 | 'desc' => "{IndexPlug.desc}",
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68 | 'abstract' => "no",
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69 | 'inherits' => "yes" };
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70 |
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71 | sub new {
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72 | my ($class) = @_;
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73 | my $self = new BasPlug ("IndexPlug", @_);
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74 | # 14-05-02 To allow for proper inheritance of arguments - John Thompson
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75 | my $option_list = $self->{'option_list'};
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76 | push( @{$option_list}, $options );
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77 |
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78 | return bless $self, $class;
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79 | }
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80 |
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81 | # return 1 if this class might recurse using $pluginfo
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82 | sub is_recursive {
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83 | my $self = shift (@_);
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84 |
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85 | return 1;
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86 | }
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87 |
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88 | # return number of files processed, undef if can't process
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89 | # Note that $base_dir might be "" and that $file might
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90 | # include directories
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91 | sub read {
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92 | my $self = shift (@_);
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93 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $gli) = @_;
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94 | my $outhandle = $self->{'outhandle'};
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95 |
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96 | my $indexfile = &util::filename_cat($base_dir, $file, "index.txt");
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97 | if (!-f $indexfile) {
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98 | # not a directory containing an index file
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99 | return undef;
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100 | }
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101 |
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102 | # found an index.txt file
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103 | print STDERR "<Processing n='$file' p='IndexPlug'>\n" if ($gli);
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104 | print $outhandle "IndexPlug: processing $indexfile\n";
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105 |
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106 | # read in the index.txt
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107 | my $list = &cfgread::read_cfg_file ($indexfile, undef, '^[^#]\w');
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108 | my @fields = ();
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109 | # see if there's a 'key:' line
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110 | if (defined $list->{'key:'}) {
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111 | @fields = @{$list->{'key:'}};
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112 | }
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113 |
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114 | my $index_base_dir = &util::filename_cat($base_dir, $file);
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115 |
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116 | # process each document
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117 | my $count = 0;
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118 | foreach my $docfile (keys (%$list)) {
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119 | last if ($maxdocs != -1 && $count >= $maxdocs);
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120 | $metadata = {}; # at present we can do this as metadata
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121 | # will always be empty when it arrives
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122 | # at this plugin - this might cause
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123 | # problems if things change though
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124 |
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125 | # note that $list->{$docfile} is an array reference
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126 | if ($docfile !~ /key:/i) {
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127 | my $i = 0;
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128 | for ($i = 0; $i < scalar (@{$list->{$docfile}}); $i ++) {
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129 | if ($list->{$docfile}->[$i] =~ /^<([^>]+)>(.+)$/) {
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130 | unless (defined ($metadata->{$1})) {
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131 | $metadata->{$1} = [];
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132 | }
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133 | push (@{$metadata->{$1}}, $2);
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134 | } elsif (scalar @fields >= $i) {
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135 | unless (defined ($metadata->{$fields[$i]})) {
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136 | $metadata->{$fields[$i]} = [];
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137 | }
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138 | push (@{$metadata->{$fields[$i]}}, $list->{$docfile}->[$i]);
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139 | } else {
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140 | $metadata->{'Subject'} = $list->{$docfile};
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141 | }
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142 | }
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143 | $count += &plugin::read ($pluginfo, $index_base_dir, $docfile, $metadata, $processor, $maxdocs);
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144 | }
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145 | }
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146 |
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147 | return $count; # was processed
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148 | }
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149 |
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150 |
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151 | 1;
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