| 1 | ###########################################################################
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| 2 | #
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| 3 | # UnknownPlug.pm -- Plugin for files you know about but Greenstone doesn't
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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) 2001 Gordon W. Paynter
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| 10 | # Copyright (C) 2001 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 | # UnknownPlug - a plugin for unknown files
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| 29 |
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| 30 | # This is a simple Plugin for importing files in formats that
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| 31 | # Greenstone doesn't know anything about. A fictional document will
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| 32 | # be created for every such file, and the file itself will be passed
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| 33 | # to Greenstone as the "associated file" of the document.
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| 34 |
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| 35 | # Here's an example where it is useful: I have a collection of
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| 36 | # pictures that include a couple of quicktime movie files with names
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| 37 | # like DCP_0163.MOV. Rather than write a new plugin for quicktime
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| 38 | # movies, I add this line to the collection configuration file:
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| 39 |
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| 40 | # plugin UnknownPlug -process_exp "*.MOV" -assoc_field "movie"
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| 41 |
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| 42 | # A document is created for each movie, with the associated movie
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| 43 | # file's name in the "movie" metadata field. In the collection's
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| 44 | # format strings, I use the {If} macro to output different text for
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| 45 | # each type of file, like this:
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| 46 |
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| 47 | # {If}{[movie],<HTML for displaying movie>}{If}{[Image],<HTML for displaying image>}
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| 48 |
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| 49 | # You can also add extra metadata, such as the Title, Subject, and
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| 50 | # Duration, with metadata.xml files and RecPlug. (If you want to use
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| 51 | # UnknownPlug with more than one type of file, you will have to add
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| 52 | # some sort of distinguishing metadata in this way.)
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| 53 |
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| 54 |
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| 55 |
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| 56 | package UnknownPlug;
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| 57 |
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| 58 | use BasPlug;
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| 59 | use parsargv;
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| 60 |
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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 | sub print_usage {
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| 67 | print STDERR "\n usage: plugin UnknownPlug [options]\n\n";
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| 68 | print STDERR " options:\n";
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| 69 | print STDERR " -assoc_field\t Name of the metadata field that will hold\n";
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| 70 | print STDERR "\t\t the associated file's name.\n";
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| 71 | print STDERR "\n";
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| 72 | print STDERR " -file_type\t Mime type of the file (e.g. image/gif)\n";
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| 73 | print STDERR "\n";
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| 74 | }
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| 75 |
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| 76 | sub new {
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| 77 | my ($class) = @_;
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| 78 | my $self = new BasPlug ($class, @_);
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| 79 |
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| 80 | if (!parsargv::parse(\@_,
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| 81 | q^assoc_field/.*/^, \$self->{'assoc_field'},
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| 82 | q^file_type/.*/^, \$self->{'file_type'},
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| 83 | "allow_extra_options")) {
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| 84 | print STDERR "\nIncorrect options passed to UnknownPlug, check your collect.cfg configuration file\n";
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| 85 | &print_usage();
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| 86 | die "\n";
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| 87 | }
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| 88 |
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| 89 |
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| 90 | return bless $self, $class;
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| 91 | }
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| 92 |
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| 93 | sub get_default_process_exp {
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| 94 | return '';
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| 95 | }
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| 96 |
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| 97 |
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| 98 | # Associate the unknown file with the new document
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| 99 |
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| 100 | sub associate_unknown_file {
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| 101 | my $self = shift (@_);
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| 102 | my $filename = shift (@_); # filename with full path
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| 103 | my $file = shift (@_); # filename without path
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| 104 | my $doc_obj = shift (@_);
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| 105 |
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| 106 | my $verbosity = $self->{'verbosity'};
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| 107 | my $outhandle = $self->{'outhandle'};
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| 108 |
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| 109 | # check the filename is okay
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| 110 | return 0 if ($file eq "" || $filename eq "");
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| 111 |
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| 112 | if ($filename =~ m/ /) {
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| 113 | print $outhandle "UnknownPlug: \"$filename\" contains a space. choking.\n";
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| 114 | return undef;
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| 115 | }
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| 116 |
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| 117 | # Add the file as an associated file ...
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| 118 | my $section = $doc_obj->get_top_section();
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| 119 | my $file_type = $self->{'file_type'} || "unknown/unknown";
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| 120 | my $assoc_field = $self->{'assoc_field'} || "unknown_file";
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| 121 |
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| 122 | $doc_obj->associate_file($filename, $file, $mime_type, $section);
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| 123 | $doc_obj->add_metadata ($section, $assoc_field, $file);
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| 124 |
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| 125 | return 1;
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| 126 | }
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| 127 |
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| 128 |
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| 129 |
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| 130 | # The UnknownPlug read() function. This function does all the right
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| 131 | # things to make general options work for a given plugin. UnknownPlug
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| 132 | # overrides read() because there is no need to read the actual text of
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| 133 | # the file in, because the contents of the file is not text...
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| 134 | #
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| 135 | #
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| 136 | # Return number of files processed, undef if can't process
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| 137 | #
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| 138 | # Note that $base_dir might be "" and that $file might include directories
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| 139 |
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| 140 | sub read {
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| 141 | my $self = shift (@_);
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| 142 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs) = @_;
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| 143 |
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| 144 | my $outhandle = $self->{'outhandle'};
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| 145 |
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| 146 | # Make sure we're processing the correct file
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| 147 | my $filename = &util::filename_cat($base_dir, $file);
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| 148 | return 0 if $self->{'block_exp'} ne "" && $filename =~ /$self->{'block_exp'}/;
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| 149 | if ($filename !~ /$self->{'process_exp'}/ || !-f $filename) {
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| 150 | return undef;
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| 151 | }
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| 152 | print $outhandle "UnknownPlug processing \"$filename\"\n"
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| 153 | if $self->{'verbosity'} > 1;
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| 154 |
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| 155 | #if there's a leading directory name, eat it...
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| 156 | $file =~ s/^.*[\/\\]//;
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| 157 |
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| 158 | # create a new document
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| 159 | my $doc_obj = new doc ($filename, "indexed_doc");
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| 160 | $doc_obj->set_OIDtype ($processor->{'OIDtype'});
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| 161 |
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| 162 | # associate the file with the document
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| 163 | if (associate_unknown_file($self, $filename, $file, $doc_obj) != 1)
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| 164 | {
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| 165 | print "UnknownPlug: couldn't process \"$filename\"\n";
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| 166 | return 0;
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| 167 | }
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| 168 |
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| 169 | #create an empty text string so we don't break downstream plugins
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| 170 | my $text = "Dummy text inserted by UnknownPlug...";
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| 171 |
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| 172 | # include any metadata passed in from previous plugins
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| 173 | my $section = $doc_obj->get_top_section();
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| 174 | $self->extra_metadata ($doc_obj, $section, $metadata);
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| 175 |
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| 176 | # do plugin specific processing of doc_obj
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| 177 | return undef unless defined ($self->process (\$text, $pluginfo, $base_dir,
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| 178 | $file, $metadata, $doc_obj));
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| 179 |
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| 180 | # do any automatic metadata extraction
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| 181 | $self->auto_extract_metadata ($doc_obj);
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| 182 |
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| 183 | # add an OID
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| 184 | $doc_obj->set_OID();
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| 185 | $doc_obj->add_text($section, $text);
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| 186 |
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| 187 | # process the document
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| 188 | $processor->process($doc_obj);
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| 189 |
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| 190 | return 1;
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| 191 | }
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| 192 |
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| 193 |
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| 194 | # UnknownPlug processing of doc_obj. In practice we don't need to do
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| 195 | # anything here because the read function takes care of everything.
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| 196 |
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| 197 | sub process {
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| 198 | my $self = shift (@_);
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| 199 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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| 200 | my $outhandle = $self->{'outhandle'};
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| 201 |
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| 202 | return 1;
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| 203 | }
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| 204 |
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| 205 |
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| 206 | 1;
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| 207 |
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| 208 |
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| 209 |
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| 210 |
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| 211 |
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| 212 |
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| 214 |
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| 215 |
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| 217 |
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