| 1 | ###########################################################################
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| 2 | #
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| 3 | # lucenebuildproc.pm -- perl wrapper for building index with Lucene
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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 | package lucenebuildproc;
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| 27 |
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| 28 | # This document processor outputs a document
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| 29 | # for lucene to process
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| 30 |
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| 31 | # Use same basic XML structure setup by mgppbuilder/mgppbuildproc
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| 32 |
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| 33 | use mgppbuildproc;
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| 34 | use ghtml;
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| 35 | use strict;
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| 36 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 37 |
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| 38 |
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| 39 | use IncrementalBuildUtils;
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| 40 |
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| 41 | sub BEGIN {
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| 42 | @lucenebuildproc::ISA = ('mgppbuildproc');
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| 43 | }
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| 44 |
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| 45 |
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| 46 | sub new {
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| 47 | my $class = shift @_;
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| 48 | my $self = new mgppbuildproc (@_);
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| 49 |
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| 50 | $self->{'numincdocs'} = 0;
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| 51 |
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| 52 | return bless $self, $class;
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| 53 | }
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| 54 |
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| 55 |
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| 56 | sub is_incremental_capable
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| 57 | {
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| 58 | my $self = shift (@_);
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| 59 |
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| 60 | # Unlike MG and MGPP, Lucene supports incremental building
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| 61 | return 1;
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| 62 | }
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| 63 |
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| 64 |
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| 65 | sub text {
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| 66 | my $self = shift (@_);
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| 67 | my ($doc_obj,$file) = @_;
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| 68 | my $handle = $self->{'output_handle'};
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| 69 | my $outhandle = $self->{'outhandle'};
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| 70 |
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| 71 | # only output this document if it is one to be indexed
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| 72 | return if ($doc_obj->get_doc_type() ne "indexed_doc");
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| 73 |
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| 74 | my $indexed_doc = $self->is_subcollection_doc($doc_obj);
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| 75 |
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| 76 | # this is another document
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| 77 | $self->{'num_docs'} += 1;
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| 78 |
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| 79 | # get the parameters for the output
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| 80 | # split on : just in case there is subcoll and lang stuff
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| 81 | my ($fields) = split (/:/, $self->{'index'});
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| 82 |
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| 83 | my $doc_level = $mgppbuildproc::level_map{'document'};
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| 84 | my $gs2ns = 'xmlns:gs2="http://www.greenstone.org/gs2"';
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| 85 |
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| 86 | my $levels = $self->{'levels'};
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| 87 | my $ldoc_level = $levels->{'document'};
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| 88 | my $lsec_level = $levels->{'section'};
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| 89 | my $lpar_level = $levels->{'paragraph'};
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| 90 |
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| 91 | my $docid="";
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| 92 | if ($ldoc_level)
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| 93 | {
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| 94 | if ($self->{'gdbm_level'} eq 'document')
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| 95 | {
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| 96 | my $doc_sec_num = $self->{'num_docs'};
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| 97 | $docid = "gs2:id=\"$doc_sec_num\"";
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| 98 | }
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| 99 | else
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| 100 | {
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| 101 | # default is section level
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| 102 | my $doc_sec_num = $self->{'num_sections'} + 1;
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| 103 | $docid = "gs2:id=\"$doc_sec_num\"";
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| 104 | }
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| 105 | }
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| 106 | my $documenttag = "<$doc_level $gs2ns file=\"$file\" $docid >\n";
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| 107 | my $documentendtag = "\n</$doc_level>\n";
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| 108 |
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| 109 | my ($sectiontag) = "";
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| 110 | if ($lsec_level)
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| 111 | {
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| 112 | $sectiontag = $mgppbuildproc::level_map{'section'};
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| 113 | }
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| 114 | my ($parastarttag) = "";
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| 115 | my ($paraendtag) = "";
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| 116 | if ($self->{'levels'}->{'paragraph'})
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| 117 | {
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| 118 | if ($self->{'strip_html'})
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| 119 | {
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| 120 | $parastarttag = "<".$mgppbuildproc::level_map{'paragraph'}.">";
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| 121 | $paraendtag = "</".$mgppbuildproc::level_map{'paragraph'}.">";
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| 122 | }
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| 123 | else
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| 124 | {
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| 125 | print $outhandle "Paragraph level can not be used with no_strip_html!. Not indexing Paragraphs.\n";
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| 126 | }
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| 127 | }
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| 128 |
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| 129 | my $doc_section = 0; # just for this document
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| 130 |
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| 131 | my $text = "";
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| 132 | $text .= $documenttag;
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| 133 | # get the text for this document
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| 134 | my $section = $doc_obj->get_top_section();
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| 135 | while (defined $section)
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| 136 | {
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| 137 | # update a few statistics
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| 138 | $doc_section++;
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| 139 | $self->{'num_sections'}++;
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| 140 |
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| 141 | if ($sectiontag ne "")
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| 142 | {
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| 143 | my $secid = "gs2:id=\"".$self->{'num_sections'}."\"";
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| 144 | $text .= "\n<$sectiontag $secid >\n";
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| 145 | }
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| 146 |
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| 147 | # if we are doing subcollections, then some docs shouldn't be indexed.
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| 148 | # but we need to put the section tag placeholders in there so the
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| 149 | # sections match up with gdbm db
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| 150 | my $indexed_section = $doc_obj->get_metadata_element($section, "gsdldoctype") || "indexed_section";
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| 151 | if (($indexed_doc == 0) || ($indexed_section ne "indexed_section" && $indexed_section ne "indexed_doc")) {
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| 152 | $text .= "\n</$sectiontag>\n" if ($sectiontag ne "");
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| 153 | $section = $doc_obj->get_next_section($section);
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| 154 | next;
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| 155 | }
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| 156 |
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| 157 | $self->{'num_bytes'} += $doc_obj->get_text_length ($section);
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| 158 | foreach my $field (split (/;/, $fields))
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| 159 | {
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| 160 | # only deal with this field if it doesn't start with top or
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| 161 | # this is the first section
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| 162 | my $real_field = $field;
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| 163 | next if (($real_field =~ s/^top//) && ($doc_section != 1));
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| 164 |
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| 165 | my $new_text = "";
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| 166 | my $tmp_text = "";
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| 167 |
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| 168 | # If allfields is requested add all metadata fields and text as
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| 169 | # belonging to the ZZ field
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| 170 | if ($real_field eq "allfields") {
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| 171 | # Text first - no html nor paragraph tags
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| 172 | $new_text .= "$parastarttag<ZZ index=\"1\">\n";
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| 173 | $tmp_text = $self->preprocess_text($doc_obj->get_text ($section), 1, "");
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| 174 | &ghtml::htmlsafe($tmp_text);
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| 175 | $new_text .= "$tmp_text</ZZ>$paraendtag\n";
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| 176 | # Then Metadata
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| 177 | my $metadata = $doc_obj->get_all_metadata ($section);
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| 178 | foreach my $pair (@$metadata) {
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| 179 | my ($mfield, $mvalue) = (@$pair);
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| 180 | &ghtml::htmlsafe($mvalue);
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| 181 | # check fields here, maybe others dont want - change to use dontindex!!
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| 182 | if ($mfield ne "Identifier"
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| 183 | && $mfield !~ /^gsdl/
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| 184 | && $mfield ne "classifytype"
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| 185 | && $mfield ne "assocfilepath"
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| 186 | && defined $mvalue && $mvalue ne "") {
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| 187 | $new_text .= "$parastarttag<ZZ index=\"1\">$mvalue</ZZ>$paraendtag\n";
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| 188 | }
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| 189 | if (!defined $self->{'indexfields'}->{$mfield}) {
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| 190 | $self->{'indexfields'}->{$mfield} = 1;
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| 191 | }
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| 192 | }
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| 193 | }
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| 194 | # metadata - output all metadata we know about except gsdl stuff
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| 195 | elsif ($real_field eq "metadata" || $real_field eq "allfields") {
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| 196 | my $shortname = "";
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| 197 | my $metadata = $doc_obj->get_all_metadata ($section);
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| 198 | foreach my $pair (@$metadata) {
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| 199 | my ($mfield, $mvalue) = (@$pair);
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| 200 | &ghtml::htmlsafe($mvalue);
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| 201 | # check fields here, maybe others dont want - change to use dontindex!!
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| 202 | if ($mfield ne "Identifier"
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| 203 | && $mfield !~ /^gsdl/
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| 204 | && $mfield ne "classifytype"
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| 205 | && $mfield ne "assocfilepath"
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| 206 | && defined $mvalue && $mvalue ne "") {
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| 207 |
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| 208 | if (defined $self->{'indexfieldmap'}->{$mfield}) {
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| 209 | $shortname = $self->{'indexfieldmap'}->{$mfield};
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| 210 | }
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| 211 | else {
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| 212 | $shortname = $self->create_shortname($mfield);
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| 213 | $self->{'indexfieldmap'}->{$mfield} = $shortname;
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| 214 | $self->{'indexfieldmap'}->{$shortname} = 1;
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| 215 | }
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| 216 | $new_text .= "$parastarttag<$shortname index=\"1\">$mvalue</$shortname>$paraendtag\n";
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| 217 | if (!defined $self->{'indexfields'}->{$mfield}) {
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| 218 | $self->{'indexfields'}->{$mfield} = 1;
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| 219 | }
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| 220 | }
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| 221 | }
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| 222 | }
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| 223 | else {
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| 224 | #individual metadata and or text specified - could be a comma separated list
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| 225 | my $shortname="";
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| 226 | if (defined $self->{'indexfieldmap'}->{$real_field}) {
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| 227 | $shortname = $self->{'indexfieldmap'}->{$real_field};
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| 228 | }
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| 229 | else {
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| 230 | $shortname = $self->create_shortname($real_field);
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| 231 | $self->{'indexfieldmap'}->{$real_field} = $shortname;
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| 232 | $self->{'indexfieldmap'}->{$shortname} = 1;
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| 233 | }
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| 234 |
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| 235 | my @metadata_list = ();
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| 236 | foreach my $submeta (split /,/, $real_field) {
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| 237 | if ($submeta eq "text") {
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| 238 | my $section_text = $doc_obj->get_text($section);
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| 239 | if ($self->{'indexing_text'}) {
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| 240 | # tag the text with <Text>...</Text>, add the <Paragraph> tags and always strip out HTML
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| 241 | $new_text .= "$parastarttag<$shortname index=\"1\">\n";
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| 242 | if ($parastarttag ne "") {
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| 243 | $section_text = $self->preprocess_text($section_text, 1, "</$shortname>$paraendtag$parastarttag<$shortname index=\"1\">");
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| 244 | }
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| 245 | else {
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| 246 | # we don't want to individually tag each paragraph if not doing para indexing
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| 247 | $section_text = $self->preprocess_text($section_text, 1, "");
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| 248 | }
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| 249 | $new_text .= "$section_text</$shortname>$paraendtag\n";
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| 250 | }
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| 251 | else { # leave html stuff in, but escape the tags, and dont add Paragraph tags - never retrieve paras at the moment
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| 252 | $tmp_text .= $doc_obj->get_text ($section);
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| 253 | &ghtml::htmlsafe($tmp_text);
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| 254 | $new_text .= $tmp_text;
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| 255 | }
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| 256 | }
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| 257 | else {
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| 258 | my @section_metadata = @{$doc_obj->get_metadata ($section, $submeta)};
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| 259 | if ($section ne $doc_obj->get_top_section() && $self->{'indexing_text'} && defined ($self->{'sections_index_document_metadata'})) {
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| 260 | if ($self->{'sections_index_document_metadata'} eq "always" || ( scalar(@section_metadata) == 0 && $self->{'sections_index_document_metadata'} eq "unless_section_metadata_exists")) {
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| 261 | push (@section_metadata, @{$doc_obj->get_metadata ($doc_obj->get_top_section(), $submeta)});
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| 262 | }
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| 263 | }
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| 264 | push (@metadata_list, @section_metadata);
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| 265 | }
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| 266 | }
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| 267 | foreach my $item (@metadata_list) {
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| 268 | $new_text .= "$parastarttag<$shortname index=\"1\">$item</$shortname>$paraendtag\n";
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| 269 | }
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| 270 | }
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| 271 | # filter the text
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| 272 | $self->filter_text ($field, $new_text);
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| 273 | $self->{'num_processed_bytes'} += length ($new_text);
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| 274 |
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| 275 | $text .= "$new_text";
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| 276 | } # foreach field
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| 277 |
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| 278 | $text .= "\n</$sectiontag>\n" if ($sectiontag ne "");
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| 279 |
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| 280 | $section = $doc_obj->get_next_section($section);
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| 281 | } #while defined section
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| 282 | print $handle "$text\n$documentendtag";
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| 283 | #print STDOUT "$text\n$documentendtag";
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| 284 | }
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| 285 |
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| 286 | # /** We make this builder pretend to be a document processor so we can get
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| 287 | # * information back from the plugins.
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| 288 | # *
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| 289 | # * @param $self A reference to this Lucene builder
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| 290 | # * @param $doc_obj A reference to a document object representing what was
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| 291 | # * parsed by the GAPlug
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| 292 | # * @param $file The name of the file parsed as a string
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| 293 | # *
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| 294 | # * @author John Thompson, DL Consulting Ltd
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| 295 | # */
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| 296 | sub process()
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| 297 | {
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| 298 | my $self = shift (@_);
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| 299 | my ($doc_obj, $file) = @_;
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| 300 |
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| 301 | # If this is called from any stage other than an incremental infodb we want
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| 302 | # to pass through to the superclass of build
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| 303 | if ($self->get_mode() eq "incinfodb")
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| 304 | {
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| 305 | print STDERR "*** Processing a document added using INCINFODB ***\n";
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| 306 | my ($archivedir) = $file =~ /^(.*?)(?:\/|\\)[^\/\\]*$/;
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| 307 | $archivedir = "" unless defined $archivedir;
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| 308 | $archivedir =~ s/\\/\//g;
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| 309 | $archivedir =~ s/^\/+//;
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| 310 | $archivedir =~ s/\/+$//;
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| 311 |
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| 312 | # Number of files
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| 313 | print STDERR "There are " . scalar($doc_obj->get_assoc_files()) . " associated documents...\n";
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| 314 |
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| 315 | # resolve the final filenames of the files associated with this document
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| 316 | $self->assoc_files ($doc_obj, $archivedir);
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| 317 |
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| 318 | # is this a paged or a hierarchical document
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| 319 | my ($thistype, $childtype) = $self->get_document_type ($doc_obj);
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| 320 |
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| 321 | # Determine the actual docnum by checking if we've processed any
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| 322 | # previous incrementally added documents. If so, carry on from there.
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| 323 | # Otherwise we set the counter to be the same as the number of
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| 324 | # sections encountered during the previous build
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| 325 | if ($self->{'numincdocs'} == 0)
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| 326 | {
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| 327 | $self->{'numincdocs'} = $self->{'starting_num_sections'} + 1;
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| 328 | }
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| 329 |
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| 330 | my $section = $doc_obj->get_top_section ();
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| 331 | print STDERR "+ top section: '$section'\n";
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| 332 | my $doc_OID = $doc_obj->get_OID();
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| 333 | my $url = "";
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| 334 | while (defined $section)
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| 335 | {
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| 336 | print STDERR "+ processing section: '$section'\n";
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| 337 | # Attach all the other metadata to this document
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| 338 | # output the fact that this document is a document (unless doctype
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| 339 | # has been set to something else from within a plugin
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| 340 | my $dtype = $doc_obj->get_metadata_element ($section, "doctype");
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| 341 | if (!defined $dtype || $dtype !~ /\w/)
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| 342 | {
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| 343 | $doc_obj->add_utf8_metadata($section, "doctype", $dtype);
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| 344 | }
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| 345 | # output whether this node contains text
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| 346 | if ($doc_obj->get_text_length($section) > 0)
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| 347 | {
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| 348 | $doc_obj->add_utf8_metadata($section, "hastxt", 1);
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| 349 | }
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| 350 | else
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| 351 | {
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| 352 | $doc_obj->add_utf8_metadata($section, "hastxt", 0);
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| 353 | }
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| 354 |
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| 355 | # output archivedir if at top level
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| 356 | if ($section eq $doc_obj->get_top_section())
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| 357 | {
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| 358 | $doc_obj->add_utf8_metadata($section, "archivedir", $archivedir);
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| 359 | $doc_obj->add_utf8_metadata($section, "thistype", $thistype);
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| 360 | }
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| 361 |
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| 362 | # output a list of children
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| 363 | my $children = $doc_obj->get_children ($section);
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| 364 | if (scalar(@$children) > 0)
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| 365 | {
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| 366 | $doc_obj->add_utf8_metadata($section, "childtype", $childtype);
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| 367 | my @contains = ();
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| 368 | foreach my $child (@$children)
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| 369 | {
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| 370 | if ($child =~ /^.*?\.(\d+)$/)
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| 371 | {
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| 372 | push (@contains, "\".$1");
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| 373 | }
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| 374 | else
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| 375 | {
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| 376 | push (@contains, "\".$child");
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| 377 | }
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| 378 | }
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| 379 | $doc_obj->add_utf8_metadata($section, "contains", join(";", @contains));
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| 380 | }
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| 381 | #output the matching doc number
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| 382 | print STDERR "+ docnum=" . $self->{'numincdocs'} . "\n";
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| 383 | $doc_obj->add_utf8_metadata($section, "docnum", $self->{'numincdocs'});
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| 384 |
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| 385 | $self->{'numincdocs'}++;
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| 386 | $section = $doc_obj->get_next_section($section);
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| 387 | # if no sections wanted, only gdbm the docs
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| 388 | last if ($self->{'gdbm_level'} eq "document");
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| 389 | }
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| 390 | print STDERR "\n*** incrementally add metadata from document at: " . $file . "\n";
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| 391 | &IncrementalBuildUtils::addDocument($self->{'collection'}, $doc_obj, $doc_obj->get_top_section());
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| 392 | }
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| 393 | else
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| 394 | {
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| 395 | $self->mgppbuildproc::process(@_);
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| 396 | }
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| 397 | }
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| 398 | # /** process() **/
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| 399 |
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| 400 |
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| 401 | # Following methods seem to be no different to those defined in basebuildproc.pm
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| 402 | # From inspection, it looks like these ones can be removed
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| 403 |
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| 404 |
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| 405 | sub get_num_docs {
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| 406 | my $self = shift (@_);
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| 407 | #rint STDERR "get_num_docs(): $self->{'num_docs'}\n";
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| 408 | return $self->{'num_docs'};
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| 409 | }
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| 410 |
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| 411 | sub get_num_sections {
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| 412 | my $self = shift (@_);
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| 413 | #rint STDERR "get_num_sections(): $self->{'num_sections'}\n";
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| 414 | return $self->{'num_sections'};
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| 415 | }
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| 416 |
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| 417 | # num_bytes is the actual number of bytes in the collection
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|---|
| 418 | # this is normally the same as what's processed during text compression
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|---|
| 419 | sub get_num_bytes {
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| 420 | my $self = shift (@_);
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|---|
| 421 | #rint STDERR "get_num_bytes(): $self->{'num_bytes'}\n";
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| 422 | return $self->{'num_bytes'};
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| 423 | }
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|---|
| 424 |
|
|---|
| 425 |
|
|---|
| 426 | # This is similar to mgppbuildproc's preprocess_text but adds extra spaces
|
|---|
| 427 | # Otherwise the removal of tags below might lead to Lucene turning
|
|---|
| 428 | # "...farming</p>\n<p>EDWARD.." into "farmingedward"
|
|---|
| 429 | # (example from demo collection b20cre)
|
|---|
| 430 | # Many thanks to John Thompson, DL Consulting Ltd. (www.dlconsulting.com)
|
|---|
| 431 | sub preprocess_text
|
|---|
| 432 | {
|
|---|
| 433 | my $self = shift (@_);
|
|---|
| 434 | my ($text, $strip_html, $para) = @_;
|
|---|
| 435 | # at this stage, we do not do paragraph tags unless have strip_html -
|
|---|
| 436 | # it will result in a huge mess of non-xml
|
|---|
| 437 | return unless $strip_html;
|
|---|
| 438 |
|
|---|
| 439 | my $new_text = $text;
|
|---|
| 440 |
|
|---|
| 441 | # if we have <pre> tags, we can have < > inside them, need to delete
|
|---|
| 442 | # the <> before stripping tags
|
|---|
| 443 | $new_text =~ s/<pre>(.*?)<\/pre>/$self->remove_gtlt($1,$para)/gse;
|
|---|
| 444 |
|
|---|
| 445 | if ($para eq "") {
|
|---|
| 446 | # just remove all tags
|
|---|
| 447 | $new_text =~ s/<[^>]*>/ /gs;
|
|---|
| 448 | } else {
|
|---|
| 449 | # strip all tags except <p> tags which get turned into $para
|
|---|
| 450 | $new_text =~ s/<([^>]*)>/$self->process_tags($1, $para)/gse;
|
|---|
| 451 | }
|
|---|
| 452 |
|
|---|
| 453 | # It's important that we remove name entities because otherwise the text passed to Lucene for indexing
|
|---|
| 454 | # may not be valid XML (eg. if HTML-only entities like are used)
|
|---|
| 455 | $new_text =~ s/&\w{1,10};//g;
|
|---|
| 456 | # Remove stray '&' characters, except in &#nnnn; or &#xhhhh; entities (which are valid XML)
|
|---|
| 457 | $new_text =~ s/&([^\#])/ $1/g;
|
|---|
| 458 |
|
|---|
| 459 | return $new_text;
|
|---|
| 460 | }
|
|---|
| 461 |
|
|---|
| 462 |
|
|---|
| 463 | 1;
|
|---|
| 464 |
|
|---|
