1 | ###########################################################################
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2 | #
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3 | # NULPlug.pm -- Plugin for dummy (.nul) files
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4 | #
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5 | # A component of the Greenstone digital library software from the New
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6 | # Zealand Digital Library Project at the University of Waikato, New
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7 | # Zealand.
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8 | #
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9 | # Copyright (C) 2005 Katherine Don
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10 | # Copyright (C) 2005 New Zealand Digital Library Project
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11 | #
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12 | # This program is free software; you can redistribute it and/or modify
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13 | # it under the terms of the GNU General Public License as published by
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14 | # the Free Software Foundation; either version 2 of the License, or
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15 | # (at your option) any later version.
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16 | #
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17 | # This program is distributed in the hope that it will be useful, but
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18 | # WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | # General Public License for more details.
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21 | #
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22 | # You should have received a copy of the GNU General Public License
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23 | # along with this program; if not, write to the Free Software
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24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | #
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26 | ###########################################################################
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27 |
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28 | # NULPlug - a plugin for dummy files
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29 |
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30 | # This is a simple Plugin for importing dummy files, along with
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31 | # their metadata. A fictional document will
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32 | # be created for every such file, and the metadata added to it.
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33 |
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34 | # This is used mainly for the null files resulting from exploding metadata
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35 | # databases
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36 |
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37 | package NULPlug;
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38 |
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39 | use BasPlug;
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40 |
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41 | use strict;
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42 | no strict 'refs'; # allow filehandles to be variables and viceversa
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43 |
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44 | sub BEGIN {
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45 | @NULPlug::ISA = ('BasPlug');
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46 | }
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47 |
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48 | my $arguments =
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49 | [ { 'name' => "process_exp",
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50 | 'desc' => "{BasPlug.process_exp}",
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51 | 'type' => "regexp",
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52 | 'reqd' => "no",
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53 | 'deft' => &get_default_process_exp() },
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54 | { 'name' => "assoc_field",
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55 | 'desc' => "{NULPlug.assoc_field}",
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56 | 'type' => "string",
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57 | 'deft' => "",
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58 | 'reqd' => "no" } ];
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59 |
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60 | my $options = { 'name' => "NULPlug",
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61 | 'desc' => "{NULPlug.desc}",
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62 | 'abstract' => "no",
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63 | 'inherits' => "yes",
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64 | 'args' => $arguments };
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65 |
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66 |
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67 | sub new {
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68 | my ($class) = shift (@_);
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69 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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70 | push(@$pluginlist, $class);
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71 |
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72 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
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73 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
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74 |
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75 | my $self = new BasPlug($pluginlist, $inputargs, $hashArgOptLists);
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76 |
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77 | return bless $self, $class;
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78 | }
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79 |
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80 | sub get_default_process_exp {
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81 | return '(?i)\.nul$';
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82 | }
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83 |
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84 | # The NULPlug read() function. This function does all the right
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85 | # things to make general options work for a given plugin. NULPlug
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86 | # overrides read() because there is no need to read the actual text of
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87 | # the file in, because the contents of the file is not text...
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88 | #
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89 | #
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90 | # Return number of files processed, undef if can't process
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91 | #
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92 | # Note that $base_dir might be "" and that $file might include directories
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93 |
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94 | sub read {
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95 | my $self = shift (@_);
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96 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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97 |
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98 | my $outhandle = $self->{'outhandle'};
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99 |
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100 | #check for associate_ext, blocking etc
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101 | my ($block_status,$filename) = $self->read_block(@_);
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102 | return $block_status if ((!defined $block_status) || ($block_status==0));
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103 |
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104 | print STDERR "<Processing n='$file' p='NULPlug'>\n" if ($gli);
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105 | print $outhandle "NULPlug processing \"$filename\"\n"
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106 | if $self->{'verbosity'} > 1;
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107 |
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108 | #if there's a leading directory name, eat it...
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109 | $file =~ s/^.*[\/\\]//;
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110 |
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111 | # create a new document
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112 | my $doc_obj = new doc ($filename, "indexed_doc");
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113 | $doc_obj->set_OIDtype ($processor->{'OIDtype'}, $processor->{'OIDmetadata'});
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114 | #$doc_obj->set_OIDtype ("incremental");
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115 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "Plugin", "$self->{'plugin_type'}");
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116 | $doc_obj->add_metadata($doc_obj->get_top_section(), "Source", &ghtml::dmsafe($file)); # set the filename as Source metadata to be consistent with other plugins
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117 |
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118 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "FileSize", (-s $filename));
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119 |
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120 | my $assoc_field = $self->{'assoc_field'} || "null_file";
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121 | $doc_obj->add_metadata ($doc_obj->get_top_section(), $assoc_field, $file);
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122 |
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123 | #create an empty text string so we don't break downstream plugins
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124 | my $text = &gsprintf::lookup_string("{BasPlug.dummy_text}");
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125 |
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126 | # include any metadata passed in from previous plugins
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127 | my $section = $doc_obj->get_top_section();
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128 | $self->extra_metadata ($doc_obj, $section, $metadata);
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129 |
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130 | $self->title_fallback($doc_obj,$section,$file);
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131 |
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132 | # do plugin specific processing of doc_obj
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133 | unless (defined ($self->process(\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj))) {
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134 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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135 | return -1;
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136 | }
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137 |
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138 | # do any automatic metadata extraction
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139 | $self->auto_extract_metadata ($doc_obj);
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140 |
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141 | # add an OID
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142 | $doc_obj->set_OID();
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143 | $doc_obj->add_text($section, $text);
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144 |
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145 | # process the document
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146 | $processor->process($doc_obj);
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147 |
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148 | $self->{'num_processed'} ++;
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149 | return 1;
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150 | }
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151 |
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152 |
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153 | # NULPlug processing of doc_obj. In practice we don't need to do
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154 | # anything here because the read function takes care of everything.
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155 |
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156 | sub process {
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157 | my $self = shift (@_);
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158 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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159 | my $outhandle = $self->{'outhandle'};
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160 |
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161 | return 1;
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162 | }
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163 |
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164 |
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165 | 1;
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166 |
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167 |
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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 |
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173 |
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174 |
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175 |
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176 |
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