1 | ###########################################################################
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2 | #
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3 | # MetadataCSVPlugin.pm -- A plugin for metadata in comma-separated value format
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4 | #
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5 | # A component of the Greenstone digital library software
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6 | # from the New Zealand Digital Library Project at the
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7 | # University of Waikato, New Zealand.
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8 | #
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9 | # Copyright 2006 New Zealand Digital Library Project
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10 | #
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11 | # This program is free software; you can redistribute it and/or modify
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12 | # it under the terms of the GNU General Public License as published by
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13 | # the Free Software Foundation; either version 2 of the License, or
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14 | # (at your option) any later version.
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15 | #
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16 | # This program is distributed in the hope that it will be useful,
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17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | # GNU General Public License for more details.
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20 | #
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21 | # You should have received a copy of the GNU General Public License
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22 | # along with this program; if not, write to the Free Software
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23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 | #
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25 | ###########################################################################
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26 |
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27 | package MetadataCSVPlugin;
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28 |
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29 |
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30 | use BasePlugin;
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31 | use strict;
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32 |
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33 |
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34 | sub BEGIN {
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35 | @MetadataCSVPlugin::ISA = ('BasePlugin');
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36 | }
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37 |
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38 |
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39 | my $arguments = [
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40 | { 'name' => "process_exp",
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41 | 'desc' => "{BasePlugin.process_exp}",
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42 | 'type' => "regexp",
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43 | 'reqd' => "no",
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44 | 'deft' => &get_default_process_exp() }
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45 |
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46 | ];
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47 |
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48 |
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49 | my $options = { 'name' => "MetadataCSVPlugin",
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50 | 'desc' => "{MetadataCSVPlugin.desc}",
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51 | 'abstract' => "no",
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52 | 'inherits' => "yes",
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53 | 'args' => $arguments };
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54 |
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55 |
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56 | sub new
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57 | {
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58 | my ($class) = shift (@_);
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59 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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60 | push(@$pluginlist, $class);
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61 |
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62 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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63 | push(@{$hashArgOptLists->{"OptList"}},$options);
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64 |
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65 | my $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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66 |
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67 | return bless $self, $class;
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68 | }
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69 |
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70 |
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71 | sub get_default_process_exp
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72 | {
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73 | return q^(?i)\.csv$^;
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74 | }
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75 |
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76 | sub metadata_read
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77 | {
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78 | my $self = shift (@_);
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79 | my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $extrametakeys, $extrametadata, $processor, $maxdocs, $gli) = @_;
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80 |
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81 | # Read metadata from CSV files
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82 | my $filename = &util::filename_cat($base_dir, $file);
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83 | if ($filename !~ /\.csv$/ || !-f $filename) {
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84 | return undef;
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85 | }
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86 | print STDERR "\n<Processing n='$file' p='MetadataCSVPlugin'>\n" if ($gli);
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87 | print STDERR "MetadataCSVPlugin: processing $file\n" if ($self->{'verbosity'}) > 1;
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88 |
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89 | # add the file to the block list so that it won't be processed in read, as we will do all we can with it here
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90 | $block_hash->{'file_blocks'}->{$filename} = 1;
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91 |
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92 | # Read the CSV file to get the metadata
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93 | my $csv_file_content;
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94 | open(CSV_FILE, "$filename");
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95 | my $csv_file_reader = new multiread();
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96 | $csv_file_reader->set_handle('MetadataCSVPlugin::CSV_FILE');
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97 | $csv_file_reader->read_file(\$csv_file_content);
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98 | close(CSV_FILE);
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99 |
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100 | # Split the file into lines and read the first line (contains the metadata names)
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101 | $csv_file_content =~ s/\r/\n/g; # Handle non-Unix line endings
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102 | $csv_file_content =~ s/\n+/\n/g;
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103 | my @csv_file_lines = split(/\n/, $csv_file_content);
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104 | my $csv_file_field_line = shift(@csv_file_lines);
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105 | my @csv_file_fields = split(/\,/, $csv_file_field_line);
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106 | my $found_filename_field = 0;
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107 | for (my $i = 0; $i < scalar(@csv_file_fields); $i++) {
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108 | # Remove any spaces from the field names
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109 | $csv_file_fields[$i] =~ s/ //g;
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110 | if ($csv_file_fields[$i] eq "Filename") {
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111 | $found_filename_field = 1;
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112 | }
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113 | }
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114 |
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115 | if (!$found_filename_field) {
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116 | print STDERR "MetadataCSVPlugin Error: No Filename field in CSV file: $filename\n";
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117 | return -1; # error
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118 | }
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119 | # Read each line of the file and assign the metadata appropriately
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120 | foreach my $csv_line (@csv_file_lines) {
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121 | # Ignore lines containing only whitespace
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122 | next if ($csv_line =~ /^\s*$/);
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123 | my $orig_csv_line = $csv_line;
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124 | # Build a hash of metadata name to metadata value for this line
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125 | my %csv_line_metadata;
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126 | my $i = 0;
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127 | $csv_line .= ","; # To make the regular expressions simpler
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128 | while ($csv_line ne "") {
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129 | # Metadata values containing commas are quoted
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130 | if ($csv_line =~ s/^\"(.*?)\"\,//) {
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131 | # Only bother with non-empty values
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132 | if ($1 ne "" && defined($csv_file_fields[$i])) {
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133 | if (!defined $csv_line_metadata{$csv_file_fields[$i]}) {
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134 | $csv_line_metadata{$csv_file_fields[$i]} = [];
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135 | }
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136 | push (@{$csv_line_metadata{$csv_file_fields[$i]}}, $1);
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137 | }
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138 | }
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139 | # Normal comma-separated case
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140 | elsif ($csv_line =~ s/^(.*?)\,//) {
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141 | # Only bother with non-empty values
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142 | if ($1 ne "" && defined($csv_file_fields[$i])) {
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143 | if (!defined $csv_line_metadata{$csv_file_fields[$i]}) {
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144 | $csv_line_metadata{$csv_file_fields[$i]} = [];
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145 | }
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146 | push (@{$csv_line_metadata{$csv_file_fields[$i]}}, $1);
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147 | }
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148 | }
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149 | # The line must be formatted incorrectly
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150 | else {
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151 | print STDERR "MetadataCSVPlugin Error: Badly formatted CSV line: $csv_line.\n";
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152 | last;
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153 | }
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154 |
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155 | $i++;
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156 | }
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157 |
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158 | # We can't associate any metadata without knowing the file to associate it with
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159 | my $csv_line_filename_array = $csv_line_metadata{"Filename"};
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160 | if (!defined $csv_line_filename_array) {
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161 | print STDERR "MetadataCSVPlugin Error: No Filename metadata in CSV line: $orig_csv_line\n";
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162 | next;
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163 | }
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164 | my $csv_line_filename = shift(@$csv_line_filename_array);
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165 | delete $csv_line_metadata{"Filename"};
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166 |
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167 | # Associate the metadata now
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168 | $extrametadata->{$csv_line_filename} = \%csv_line_metadata;
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169 | push(@$extrametakeys, $csv_line_filename);
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170 | }
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171 | }
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172 |
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173 |
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174 | 1;
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