| 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_tag_name = $mgppbuildproc::level_map{'document'};
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| 84 |
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| 85 | my $levels = $self->{'levels'};
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| 86 | my $ldoc_level = $levels->{'document'};
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| 87 | my $lsec_level = $levels->{'section'};
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| 88 | #my $lpar_level = $levels->{'paragraph'};
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| 89 |
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| 90 | my $gs2_id = "";
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| 91 | if ($ldoc_level)
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| 92 | {
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| 93 | if ($self->{'db_level'} eq 'document')
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| 94 | {
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| 95 | $gs2_id = $self->{'num_docs'};
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| 96 | }
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| 97 | else
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| 98 | {
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| 99 | # default is section level
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| 100 | $gs2_id = $self->{'num_sections'} + 1;
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| 101 | }
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| 102 | }
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| 103 | my $gs2_docOID = $doc_obj->get_OID();
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| 104 | my $documenttag = "<$doc_tag_name xmlns:gs2=\"http://www.greenstone.org/gs2\" file=\"$file\" gs2:id=\"$gs2_id\" gs2:docOID=\"$gs2_docOID\">\n";
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| 105 | my $documentendtag = "\n</$doc_tag_name>\n";
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| 106 |
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| 107 | my $sec_tag_name = "";
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| 108 | if ($lsec_level)
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| 109 | {
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| 110 | $sec_tag_name = $mgppbuildproc::level_map{'section'};
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| 111 | }
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| 112 |
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| 113 | my $doc_section = 0; # just for this document
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| 114 |
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| 115 | my $text = "";
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| 116 | $text .= $documenttag;
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| 117 | # get the text for this document
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| 118 | my $section = $doc_obj->get_top_section();
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| 119 | while (defined $section)
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| 120 | {
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| 121 | # update a few statistics
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| 122 | $doc_section++;
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| 123 | $self->{'num_sections'}++;
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| 124 |
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| 125 | if ($sec_tag_name ne "")
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| 126 | {
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| 127 | my $sec_gs2_id = $self->{'num_sections'};
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| 128 | my $sec_gs2_docOID = $gs2_docOID . "." . $section;
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| 129 | $text .= "\n<$sec_tag_name gs2:id=\"$sec_gs2_id\" gs2:docOID=\"$sec_gs2_docOID\">\n";
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| 130 | }
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| 131 |
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| 132 | # if we are doing subcollections, then some docs shouldn't be indexed.
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| 133 | # but we need to put the section tag placeholders in there so the
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| 134 | # sections match up with database
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| 135 | my $indexed_section = $doc_obj->get_metadata_element($section, "gsdldoctype") || "indexed_section";
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| 136 | if (($indexed_doc == 0) || ($indexed_section ne "indexed_section" && $indexed_section ne "indexed_doc")) {
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| 137 | $text .= "\n</$sec_tag_name>\n" if ($sec_tag_name ne "");
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| 138 | $section = $doc_obj->get_next_section($section);
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| 139 | next;
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| 140 | }
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| 141 |
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| 142 | $self->{'num_bytes'} += $doc_obj->get_text_length ($section);
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| 143 |
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| 144 | # has the user added a 'metadata' index?
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| 145 | my $all_metadata_specified = 0;
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| 146 | # which fields have already been indexed? (same as fields, but in a map)
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| 147 | my $specified_fields = {};
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| 148 |
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| 149 | # do we have an allfields index??
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| 150 | my $allfields_index = 0;
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| 151 | # collect up all the text for it in here
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| 152 | my $allfields_text = "";
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| 153 | foreach my $field (split (/;/, $fields)) {
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| 154 | if ($field eq "allfields") {
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| 155 | $allfields_index = 1;
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| 156 | } elsif ($field eq "metadata") {
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| 157 | $all_metadata_specified = 1;
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| 158 | }
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| 159 | }
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| 160 |
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| 161 | foreach my $field (split (/;/, $fields)) {
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| 162 |
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| 163 | # only deal with this field if it doesn't start with top or
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| 164 | # this is the first section
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| 165 | my $real_field = $field;
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| 166 | next if (($real_field =~ s/^top//) && ($doc_section != 1));
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| 167 |
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| 168 | # process these two later
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| 169 | next if ($real_field eq "allfields" || $real_field eq "metadata");
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| 170 |
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| 171 | #individual metadata and or text specified - could be a comma separated list
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| 172 | $specified_fields->{$real_field} = 1;
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| 173 | my $shortname="";
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| 174 | my $new_field = 0; # have we found a new field name?
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| 175 | if (defined $self->{'indexfieldmap'}->{$real_field}) {
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| 176 | $shortname = $self->{'indexfieldmap'}->{$real_field};
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| 177 | }
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| 178 | else {
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| 179 | $shortname = $self->create_shortname($real_field);
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| 180 | $new_field = 1;
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| 181 | }
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| 182 |
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| 183 | my @metadata_list = (); # put any metadata values in here
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| 184 | my $section_text = ""; # put the text in here
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| 185 | foreach my $submeta (split /,/, $real_field) {
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| 186 | if ($submeta eq "text") {
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| 187 | # no point in indexing text more than once
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| 188 | if ($section_text eq "") {
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| 189 | $section_text = $doc_obj->get_text($section);
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| 190 | if ($self->{'indexing_text'}) {
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| 191 | # we always strip html
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| 192 | $section_text = $self->preprocess_text($section_text, 1, "");
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| 193 | }
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| 194 | else {
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| 195 | # leave html stuff in, but escape the tags
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| 196 | &ghtml::htmlsafe($section_text);
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| 197 | }
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| 198 | }
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| 199 | }
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| 200 | else {
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| 201 | # its a metadata element
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| 202 | my @section_metadata = @{$doc_obj->get_metadata ($section, $submeta)};
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| 203 | if ($section ne $doc_obj->get_top_section() && $self->{'indexing_text'} && defined ($self->{'sections_index_document_metadata'})) {
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| 204 | if ($self->{'sections_index_document_metadata'} eq "always" || ( scalar(@section_metadata) == 0 && $self->{'sections_index_document_metadata'} eq "unless_section_metadata_exists")) {
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| 205 | push (@section_metadata, @{$doc_obj->get_metadata ($doc_obj->get_top_section(), $submeta)});
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| 206 | }
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| 207 | }
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| 208 | push (@metadata_list, @section_metadata);
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| 209 | }
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| 210 | } # for each field in this one index
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| 211 |
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| 212 | # now we add the text and/or metadata into new_text
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| 213 | if ($section_text ne "" || scalar(@metadata_list)) {
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| 214 | my $new_text = "";
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| 215 |
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| 216 | if ($section_text ne "") {
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| 217 | $new_text .= "$section_text ";
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| 218 | }
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| 219 |
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| 220 | foreach my $item (@metadata_list) {
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| 221 | &ghtml::htmlsafe($item);
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| 222 | $new_text .= "$item ";
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| 223 | }
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| 224 |
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| 225 | if ($allfields_index) {
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| 226 | $allfields_text .= $new_text;
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| 227 | }
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| 228 |
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| 229 | if ($self->{'indexing_text'}) {
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| 230 | # add the tag
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| 231 | $new_text = "<$shortname index=\"1\">$new_text</$shortname>";
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| 232 | }
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| 233 | # filter the text
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| 234 | $new_text = $self->filter_text ($field, $new_text);
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| 235 | $self->{'num_processed_bytes'} += length ($new_text);
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| 236 |
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| 237 | $text .= "$new_text";
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| 238 |
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| 239 | if ($self->{'indexing_text'} && $new_field) {
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| 240 | # we need to add to the list in indexfields
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| 241 |
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| 242 | $self->{'indexfieldmap'}->{$real_field} = $shortname;
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| 243 | $self->{'indexfieldmap'}->{$shortname} = 1;
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| 244 | }
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| 245 |
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| 246 | }
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| 247 |
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| 248 | } # foreach field
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| 249 |
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| 250 |
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| 251 | if ($all_metadata_specified) {
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| 252 |
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| 253 | my $new_text = "";
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| 254 | my $shortname = "";
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| 255 | my $metadata = $doc_obj->get_all_metadata ($section);
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| 256 | foreach my $pair (@$metadata) {
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| 257 | my ($mfield, $mvalue) = (@$pair);
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| 258 | # no value
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| 259 | next unless defined $mvalue && $mvalue ne "";
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| 260 | # we have already indexed this
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| 261 | next if defined ($specified_fields->{$mfield});
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| 262 | # check fields here, maybe others dont want - change to use dontindex!!
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| 263 | next if ($mfield eq "Identifier" || $mfield eq "classifytype" || $mfield eq "assocfilepath");
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| 264 | next if ($mfield =~ /^gsdl/);
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| 265 |
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| 266 | &ghtml::htmlsafe($mvalue);
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| 267 |
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| 268 | if (defined $self->{'indexfieldmap'}->{$mfield}) {
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| 269 | $shortname = $self->{'indexfieldmap'}->{$mfield};
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| 270 | }
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| 271 | else {
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| 272 | $shortname = $self->create_shortname($mfield);
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| 273 | $self->{'indexfieldmap'}->{$mfield} = $shortname;
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| 274 | $self->{'indexfieldmap'}->{$shortname} = 1;
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| 275 | }
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| 276 | $new_text .= "<$shortname index=\"1\">$mvalue</$shortname>\n";
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| 277 | if ($allfields_index) {
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| 278 | $allfields_text .= "$mvalue ";
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| 279 | }
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| 280 |
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| 281 | if (!defined $self->{'indexfields'}->{$mfield}) {
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| 282 | $self->{'indexfields'}->{$mfield} = 1;
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| 283 | }
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| 284 |
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| 285 | }
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| 286 | # filter the text
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| 287 | $new_text = $self->filter_text ("metadata", $new_text);
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| 288 |
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| 289 | $self->{'num_processed_bytes'} += length ($new_text);
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| 290 | $text .= "$new_text";
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| 291 |
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| 292 |
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| 293 | }
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| 294 |
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| 295 | if ($allfields_index) {
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| 296 | # add the index name mapping
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| 297 | $self->{'indexfieldmap'}->{"allfields"} = "ZZ";
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| 298 | $self->{'indexfieldmap'}->{"ZZ"} = 1;
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| 299 |
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| 300 | my $new_text = "<ZZ index=\"1\">$allfields_text</ZZ>\n";
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| 301 | # filter the text
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| 302 | $new_text = $self->filter_text ("allfields", $new_text);
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| 303 |
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| 304 | $self->{'num_processed_bytes'} += length ($new_text);
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| 305 | $text .= "$new_text";
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| 306 | }
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| 307 |
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| 308 | $text .= "\n</$sec_tag_name>\n" if ($sec_tag_name ne "");
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| 309 |
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| 310 | $section = $doc_obj->get_next_section($section);
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| 311 | } #while defined section
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| 312 | print $handle "$text\n$documentendtag";
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| 313 | #print STDOUT "$text\n$documentendtag";
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| 314 | }
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| 315 |
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| 316 | # /** We make this builder pretend to be a document processor so we can get
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| 317 | # * information back from the plugins.
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| 318 | # *
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| 319 | # * @param $self A reference to this Lucene builder
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| 320 | # * @param $doc_obj A reference to a document object representing what was
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| 321 | # * parsed by the GAPlug
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| 322 | # * @param $file The name of the file parsed as a string
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| 323 | # *
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| 324 | # * @author John Thompson, DL Consulting Ltd
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| 325 | # */
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| 326 | sub process()
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| 327 | {
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| 328 | my $self = shift (@_);
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| 329 | my ($doc_obj, $file) = @_;
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| 330 |
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| 331 | # If this is called from any stage other than an incremental infodb we want
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| 332 | # to pass through to the superclass of build
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| 333 | if ($self->get_mode() eq "incinfodb")
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| 334 | {
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| 335 | print STDERR "*** Processing a document added using INCINFODB ***\n" if ($self->{'verbosity'} > 3);
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| 336 | my ($archivedir) = $file =~ /^(.*?)(?:\/|\\)[^\/\\]*$/;
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| 337 | $archivedir = "" unless defined $archivedir;
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| 338 | $archivedir =~ s/\\/\//g;
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| 339 | $archivedir =~ s/^\/+//;
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| 340 | $archivedir =~ s/\/+$//;
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| 341 |
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| 342 | # Number of files
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| 343 | print STDERR "There are " . scalar(@{$doc_obj->get_assoc_files()}) . " associated documents...\n" if ($self->{'verbosity'} > 3);
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| 344 |
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| 345 | # resolve the final filenames of the files associated with this document
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| 346 | $self->assoc_files ($doc_obj, $archivedir);
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| 347 |
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| 348 | # is this a paged or a hierarchical document
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| 349 | my ($thistype, $childtype) = $self->get_document_type ($doc_obj);
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| 350 |
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| 351 | # Determine the actual docnum by checking if we've processed any
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| 352 | # previous incrementally added documents. If so, carry on from there.
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| 353 | # Otherwise we set the counter to be the same as the number of
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| 354 | # sections encountered during the previous build
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| 355 | if ($self->{'numincdocs'} == 0)
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| 356 | {
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| 357 | $self->{'numincdocs'} = $self->{'starting_num_sections'} + 1;
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| 358 | }
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| 359 |
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| 360 | my $section = $doc_obj->get_top_section ();
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| 361 | print STDERR "+ top section: '$section'\n" if ($self->{'verbosity'} > 3);
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| 362 | my $doc_OID = $doc_obj->get_OID();
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| 363 | my $url = "";
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| 364 | while (defined $section)
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| 365 | {
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| 366 | print STDERR "+ processing section: '$section'\n" if ($self->{'verbosity'} > 3);
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| 367 | # Attach all the other metadata to this document
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| 368 | # output the fact that this document is a document (unless doctype
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| 369 | # has been set to something else from within a plugin
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| 370 | my $dtype = $doc_obj->get_metadata_element ($section, "doctype");
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| 371 | if (!defined $dtype || $dtype !~ /\w/)
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| 372 | {
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| 373 | #$doc_obj->add_utf8_metadata($section, "doctype", $dtype);
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| 374 | $doc_obj->add_utf8_metadata($section, "doctype", "doc");
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| 375 | }
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| 376 | # output whether this node contains text
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| 377 | if ($doc_obj->get_text_length($section) > 0)
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| 378 | {
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| 379 | $doc_obj->add_utf8_metadata($section, "hastxt", 1);
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| 380 | }
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| 381 | else
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| 382 | {
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| 383 | $doc_obj->add_utf8_metadata($section, "hastxt", 0);
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| 384 | }
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| 385 |
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| 386 | # output archivedir if at top level
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| 387 | if ($section eq $doc_obj->get_top_section())
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| 388 | {
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| 389 | $doc_obj->add_utf8_metadata($section, "archivedir", $archivedir);
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| 390 | $doc_obj->add_utf8_metadata($section, "thistype", $thistype);
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| 391 | }
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| 392 |
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| 393 | # output a list of children
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| 394 | my $children = $doc_obj->get_children ($section);
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| 395 | if (scalar(@$children) > 0)
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| 396 | {
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| 397 | $doc_obj->add_utf8_metadata($section, "childtype", $childtype);
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| 398 | my @contains = ();
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| 399 | foreach my $child (@$children)
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| 400 | {
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| 401 | if ($child =~ /^.*?\.(\d+)$/)
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| 402 | {
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| 403 | push (@contains, "\".$1");
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| 404 | }
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| 405 | else
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| 406 | {
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| 407 | push (@contains, "\".$child");
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| 408 | }
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| 409 | }
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| 410 | $doc_obj->add_utf8_metadata($section, "contains", join(";", @contains));
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| 411 | }
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| 412 | #output the matching doc number
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| 413 | print STDERR "+ docnum=" . $self->{'numincdocs'} . "\n" if ($self->{'verbosity'} > 3);
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| 414 | $doc_obj->add_utf8_metadata($section, "docnum", $self->{'numincdocs'});
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| 415 |
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| 416 | $self->{'numincdocs'}++;
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| 417 | $section = $doc_obj->get_next_section($section);
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| 418 | # if no sections wanted, only add the docs
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| 419 | last if ($self->{'db_level'} eq "document");
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| 420 | }
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| 421 | print STDERR "\n*** incrementally add metadata from document at: " . $file . "\n" if ($self->{'verbosity'} > 3);
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| 422 | &IncrementalBuildUtils::addDocument($self->{'collection'}, $doc_obj, $doc_obj->get_top_section());
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| 423 | }
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| 424 | else
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| 425 | {
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| 426 | $self->mgppbuildproc::process(@_);
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| 427 | }
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| 428 | }
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| 429 | # /** process() **/
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| 430 |
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| 431 |
|
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| 432 | # Following methods seem to be no different to those defined in basebuildproc.pm
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|---|
| 433 | # From inspection, it looks like these ones can be removed
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| 434 |
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| 435 |
|
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| 436 | sub get_num_docs {
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|---|
| 437 | my $self = shift (@_);
|
|---|
| 438 | #rint STDERR "get_num_docs(): $self->{'num_docs'}\n";
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|---|
| 439 | return $self->{'num_docs'};
|
|---|
| 440 | }
|
|---|
| 441 |
|
|---|
| 442 | sub get_num_sections {
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|---|
| 443 | my $self = shift (@_);
|
|---|
| 444 | #rint STDERR "get_num_sections(): $self->{'num_sections'}\n";
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|---|
| 445 | return $self->{'num_sections'};
|
|---|
| 446 | }
|
|---|
| 447 |
|
|---|
| 448 | # num_bytes is the actual number of bytes in the collection
|
|---|
| 449 | # this is normally the same as what's processed during text compression
|
|---|
| 450 | sub get_num_bytes {
|
|---|
| 451 | my $self = shift (@_);
|
|---|
| 452 | #rint STDERR "get_num_bytes(): $self->{'num_bytes'}\n";
|
|---|
| 453 | return $self->{'num_bytes'};
|
|---|
| 454 | }
|
|---|
| 455 |
|
|---|
| 456 |
|
|---|
| 457 | # This is similar to mgppbuildproc's preprocess_text but adds extra spaces
|
|---|
| 458 | # Otherwise the removal of tags below might lead to Lucene turning
|
|---|
| 459 | # "...farming</p>\n<p>EDWARD.." into "farmingedward"
|
|---|
| 460 | # (example from demo collection b20cre)
|
|---|
| 461 | # Many thanks to John Thompson, DL Consulting Ltd. (www.dlconsulting.com)
|
|---|
| 462 | sub preprocess_text
|
|---|
| 463 | {
|
|---|
| 464 | my $self = shift (@_);
|
|---|
| 465 | my ($text, $strip_html, $para) = @_;
|
|---|
| 466 | # at this stage, we do not do paragraph tags unless have strip_html -
|
|---|
| 467 | # it will result in a huge mess of non-xml
|
|---|
| 468 | return unless $strip_html;
|
|---|
| 469 |
|
|---|
| 470 | my $new_text = $text;
|
|---|
| 471 |
|
|---|
| 472 | # if we have <pre> tags, we can have < > inside them, need to delete
|
|---|
| 473 | # the <> before stripping tags
|
|---|
| 474 | $new_text =~ s/<pre>(.*?)<\/pre>/$self->remove_gtlt($1,$para)/gse;
|
|---|
| 475 |
|
|---|
| 476 | if ($para eq "") {
|
|---|
| 477 | # just remove all tags
|
|---|
| 478 | $new_text =~ s/<[^>]*>/ /gs;
|
|---|
| 479 | } else {
|
|---|
| 480 | # strip all tags except <p> tags which get turned into $para
|
|---|
| 481 | $new_text =~ s/<([^>]*)>/$self->process_tags($1, $para)/gse;
|
|---|
| 482 | }
|
|---|
| 483 |
|
|---|
| 484 | # It's important that we remove name entities because otherwise the text passed to Lucene for indexing
|
|---|
| 485 | # may not be valid XML (eg. if HTML-only entities like are used)
|
|---|
| 486 | $new_text =~ s/&\w{1,10};//g;
|
|---|
| 487 | # Remove stray '&' characters, except in &#nnnn; or &#xhhhh; entities (which are valid XML)
|
|---|
| 488 | $new_text =~ s/&([^\#])/ $1/g;
|
|---|
| 489 |
|
|---|
| 490 | return $new_text;
|
|---|
| 491 | }
|
|---|
| 492 |
|
|---|
| 493 |
|
|---|
| 494 | 1;
|
|---|
| 495 |
|
|---|
