| 1 | ###########################################################################
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| 2 | #
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| 3 | # ReadXMLFile.pm -- base class for XML plugins
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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) 2001 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 ReadXMLFile;
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| 27 |
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| 28 | use BasePlugin;
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| 29 | use doc;
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| 30 | use strict;
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| 31 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 32 |
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| 33 | sub BEGIN {
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| 34 | @ReadXMLFile::ISA = ('BasePlugin');
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| 35 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
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| 36 | }
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| 37 |
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| 38 | use XMLParser;
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| 39 |
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| 40 | my $arguments =
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| 41 | [ { 'name' => "process_exp",
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| 42 | 'desc' => "{BasePlugin.process_exp}",
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| 43 | 'type' => "regexp",
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| 44 | 'deft' => &get_default_process_exp(),
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| 45 | 'reqd' => "no" },
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| 46 | { 'name' => "xslt",
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| 47 | 'desc' => "{ReadXMLFile.xslt}",
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| 48 | 'type' => "string",
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| 49 | 'deft' => "",
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| 50 | 'reqd' => "no" } ];
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| 51 |
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| 52 | my $options = { 'name' => "ReadXMLFile",
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| 53 | 'desc' => "{ReadXMLFile.desc}",
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| 54 | 'abstract' => "yes",
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| 55 | 'inherits' => "yes",
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| 56 | 'args' => $arguments };
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| 57 |
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| 58 | sub new {
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| 59 | my ($class) = shift (@_);
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| 60 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 61 | push(@$pluginlist, $class);
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| 62 |
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| 63 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 64 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 65 |
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| 66 | my $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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| 67 |
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| 68 | if ($self->{'info_only'}) {
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| 69 | # don't worry about creating the XML parser as all we want is the
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| 70 | # list of plugin options
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| 71 | return bless $self, $class;
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| 72 | }
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| 73 |
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| 74 | my $parser = new XML::Parser('Style' => 'Stream',
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| 75 | 'Pkg' => 'ReadXMLFile',
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| 76 | 'PluginObj' => $self,
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| 77 | 'Handlers' => {'Char' => \&Char,
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| 78 | 'XMLDecl' => \&XMLDecl,
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| 79 | 'Entity' => \&Entity,
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| 80 | 'Doctype' => \&Doctype,
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| 81 | 'Default' => \&Default,
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| 82 | });
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| 83 |
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| 84 | $self->{'parser'} = $parser;
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| 85 |
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| 86 | return bless $self, $class;
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| 87 | }
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| 88 |
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| 89 | # the inheriting class must implement this method to tell whether to parse this doc type
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| 90 | sub get_doctype {
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| 91 | my $self = shift(@_);
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| 92 | die "$self The inheriting class must implement get_doctype method";
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| 93 | }
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| 94 |
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| 95 |
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| 96 | sub apply_xslt
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| 97 | {
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| 98 | my $self = shift @_;
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| 99 | my ($xslt,$filename) = @_;
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| 100 |
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| 101 | my $outhandle = $self->{'outhandle'};
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| 102 |
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| 103 | my $xslt_filename = $xslt;
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| 104 |
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| 105 | if (! -e $xslt_filename) {
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| 106 | # Look in main site directory
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| 107 | my $gsdlhome = $ENV{'GSDLHOME'};
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| 108 | $xslt_filename = &util::filename_cat($gsdlhome,$xslt);
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| 109 | }
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| 110 |
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| 111 | if (! -e $xslt_filename) {
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| 112 | # Look in collection directory
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| 113 | my $coldir = $ENV{'GSDLCOLLECTDIR'};
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| 114 | $xslt_filename = &util::filename_cat($coldir,$xslt);
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| 115 | }
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| 116 |
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| 117 | if (! -e $xslt_filename) {
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| 118 | print $outhandle "Warning: Unable to find XSLT $xslt\n";
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| 119 | if (open(XMLIN,"<$filename")) {
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| 120 |
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| 121 | my $untransformed_xml = "";
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| 122 | while (defined (my $line = <XMLIN>)) {
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| 123 |
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| 124 | $untransformed_xml .= $line;
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| 125 | }
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| 126 | close(XMLIN);
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| 127 |
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| 128 | return $untransformed_xml;
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| 129 | }
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| 130 | else {
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| 131 | print $outhandle "Error: Unable to open file $filename\n";
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| 132 | print $outhandle " $!\n";
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| 133 | return "";
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| 134 | }
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| 135 |
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| 136 | }
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| 137 |
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| 138 | my $bin_java = &util::filename_cat($ENV{'GSDLHOME'},"bin","java");
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| 139 | my $jar_filename = &util::filename_cat($bin_java,"xalan.jar");
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| 140 | my $xslt_base_cmd = "java -jar $jar_filename";
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| 141 | my $xslt_cmd = "$xslt_base_cmd -IN \"$filename\" -XSL \"$xslt_filename\"";
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| 142 |
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| 143 | my $transformed_xml = "";
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| 144 |
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| 145 | if (open(XSLT_IN,"$xslt_cmd |")) {
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| 146 | while (defined (my $line = <XSLT_IN>)) {
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| 147 |
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| 148 | $transformed_xml .= $line;
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| 149 | }
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| 150 | close(XSLT_IN);
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| 151 | }
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| 152 | else {
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| 153 | print $outhandle "Error: Unable to run command $xslt_cmd\n";
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| 154 | print $outhandle " $!\n";
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| 155 | }
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| 156 |
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| 157 | return $transformed_xml;
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| 158 |
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| 159 | }
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| 160 |
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| 161 | sub check_doctype {
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| 162 | my $self = shift (@_);
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| 163 |
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| 164 | my ($filename) = @_;
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| 165 |
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| 166 | if (open(XMLIN,"<$filename")) {
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| 167 | my $doctype = $self->get_doctype();
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| 168 | ## check whether the doctype has the same name as the root element tag
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| 169 | while (defined (my $line = <XMLIN>)) {
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| 170 | ## find the root element
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| 171 | if ($line =~ /<([\w\d:]+)[\s>]/){
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| 172 | my $root = $1;
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| 173 | if ($root !~ $doctype){
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| 174 | close(XMLIN);
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| 175 | return 0;
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| 176 | }
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| 177 | else {
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| 178 | close(XMLIN);
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| 179 | return 1;
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| 180 | }
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| 181 | }
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| 182 | }
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| 183 | close(XMLIN);
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| 184 | }
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| 185 |
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| 186 | return undef; # haven't found a valid line
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| 187 |
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| 188 | }
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| 189 |
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| 190 | # because we are not just using process_exp to determine whether to process or not, we need to implement this too, so that a file can be passed down if we are not actually processing it
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| 191 | sub metadata_read {
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| 192 | my $self = shift (@_);
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| 193 |
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| 194 | my ($pluginfo, $base_dir, $file, $metadata, $extrametakeys, $extrametadata, $processor, $maxdocs, $gli) = @_;
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| 195 |
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| 196 | my $result = $self->SUPER::metadata_read($pluginfo, $base_dir, $file, $metadata, $extrametakeys, $extrametadata, $processor, $maxdocs, $gli);
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| 197 |
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| 198 | if (defined $result) {
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| 199 | # we think we are processing this, but check that we actually are
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| 200 | my $filename = $self->get_full_filename($base_dir, $file);
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| 201 |
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| 202 | if ($self->check_doctype($filename)) {
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| 203 | return $result;
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| 204 | }
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| 205 | }
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| 206 | return undef;
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| 207 | }
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| 208 |
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| 209 | # we need to implement read cos we are not just using process_exp to determine
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| 210 | # whether to process this or not.
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| 211 | sub read {
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| 212 | my $self = shift (@_);
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| 213 |
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| 214 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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| 215 |
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| 216 | # Make sure we're processing the correct file, do blocking etc
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| 217 | my ($block_status,$filename_full_path) = $self->read_block(@_);
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| 218 | return $block_status if ((!defined $block_status) || ($block_status==0));
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| 219 |
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| 220 | ## check the doctype to see whether we really want to process the file
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| 221 | if (!$self->check_doctype($filename_full_path)) {
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| 222 | # this file is not for us
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| 223 | return undef;
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| 224 | }
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| 225 |
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| 226 | $file =~ s/^[\/\\]+//; # $file often begins with / so we'll tidy it up
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| 227 | $self->{'base_dir'} = $base_dir;
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| 228 | $self->{'file'} = $file;
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| 229 | $self->{'filename'} = $filename_full_path;
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| 230 | $self->{'processor'} = $processor;
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| 231 | $self->{'metadata'} = $metadata;
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| 232 |
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| 233 | eval {
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| 234 | my $xslt = $self->{'xslt'};
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| 235 | if (defined $xslt && ($xslt ne "")) {
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| 236 | # perform xslt
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| 237 | my $transformed_xml = $self->apply_xslt($xslt,$filename_full_path);
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| 238 |
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| 239 | # feed transformed file (now in memory as string) into XML parser
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| 240 | $self->{'parser'}->parse($transformed_xml);
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| 241 | }
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| 242 | else {
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| 243 | $self->{'parser'}->parsefile($filename_full_path);
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| 244 | }
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| 245 | };
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| 246 |
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| 247 | if ($@) {
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| 248 |
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| 249 | # parsefile may either croak somewhere in XML::Parser (e.g. because
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| 250 | # the document is not well formed) or die somewhere in ReadXMLFile or a
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| 251 | # derived plugin (e.g. because we're attempting to process a
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| 252 | # document whose DOCTYPE is not meant for this plugin). For the
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| 253 | # first case we'll print a warning and continue, for the second
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| 254 | # we'll just continue quietly
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| 255 |
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| 256 | print STDERR "**** Error is: $@\n";
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| 257 |
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| 258 | my ($msg) = $@ =~ /Carp::croak\(\'(.*?)\'\)/;
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| 259 | if (defined $msg) {
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| 260 | my $outhandle = $self->{'outhandle'};
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| 261 | my $plugin_name = ref ($self);
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| 262 | print $outhandle "$plugin_name failed to process $file ($msg)\n";
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| 263 | }
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| 264 |
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| 265 | # reset ourself for the next document
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| 266 | $self->{'section_level'}=0;
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| 267 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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| 268 | return -1; # error during processing
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| 269 | }
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| 270 |
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| 271 |
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| 272 | return 1; # processed the file
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| 273 | }
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| 274 |
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| 275 |
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| 276 | sub get_default_process_exp {
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| 277 | my $self = shift (@_);
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| 278 |
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| 279 | return q^(?i)\.xml$^;
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| 280 | }
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| 281 |
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| 282 | sub StartDocument {$_[0]->{'PluginObj'}->xml_start_document(@_);}
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| 283 | sub XMLDecl {$_[0]->{'PluginObj'}->xml_xmldecl(@_);}
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| 284 | sub Entity {$_[0]->{'PluginObj'}->xml_entity(@_);}
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| 285 | sub Doctype {$_[0]->{'PluginObj'}->xml_doctype(@_);}
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| 286 | sub StartTag {$_[0]->{'PluginObj'}->xml_start_tag(@_);}
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| 287 | sub EndTag {$_[0]->{'PluginObj'}->xml_end_tag(@_);}
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| 288 | sub Text {$_[0]->{'PluginObj'}->xml_text(@_);}
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| 289 | sub PI {$_[0]->{'PluginObj'}->xml_pi(@_);}
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| 290 | sub EndDocument {$_[0]->{'PluginObj'}->xml_end_document(@_);}
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| 291 | sub Default {$_[0]->{'PluginObj'}->xml_default(@_);}
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| 292 |
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| 293 | # This Char function overrides the one in XML::Parser::Stream to overcome a
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| 294 | # problem where $expat->{Text} is treated as the return value, slowing
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| 295 | # things down significantly in some cases.
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| 296 | sub Char {
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| 297 | use bytes; # Necessary to prevent encoding issues with XML::Parser 2.31+
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| 298 | $_[0]->{'Text'} .= $_[1];
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| 299 | return undef;
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| 300 | }
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| 301 |
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| 302 | # Called at the beginning of the XML document.
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| 303 | sub xml_start_document {
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| 304 | my $self = shift(@_);
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| 305 | my ($expat) = @_;
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| 306 |
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| 307 | $self->open_document();
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| 308 | }
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| 309 |
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| 310 | # Called for XML declarations
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| 311 | sub xml_xmldecl {
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| 312 | my $self = shift(@_);
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| 313 | my ($expat, $version, $encoding, $standalone) = @_;
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| 314 | }
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| 315 |
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| 316 | # Called for XML entities
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| 317 | sub xml_entity {
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| 318 | my $self = shift(@_);
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| 319 | my ($expat, $name, $val, $sysid, $pubid, $ndata) = @_;
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| 320 | }
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| 321 |
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| 322 | # Called for DOCTYPE declarations - use die to bail out if this doctype
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| 323 | # is not meant for this plugin
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| 324 | sub xml_doctype {
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| 325 | my $self = shift(@_);
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| 326 |
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| 327 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
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| 328 | die "ReadXMLFile Cannot process XML document with DOCTYPE of $name";
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| 329 | }
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| 330 |
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| 331 |
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| 332 | # Called for every start tag. The $_ variable will contain a copy of the
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| 333 | # tag and the %_ variable will contain the element's attributes.
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| 334 | sub xml_start_tag {
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| 335 | my $self = shift(@_);
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| 336 | my ($expat, $element) = @_;
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| 337 | }
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| 338 |
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| 339 | # Called for every end tag. The $_ variable will contain a copy of the tag.
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| 340 | sub xml_end_tag {
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| 341 | my $self = shift(@_);
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| 342 | my ($expat, $element) = @_;
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| 343 | }
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| 344 |
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| 345 | # Called just before start or end tags with accumulated non-markup text in
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| 346 | # the $_ variable.
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| 347 | sub xml_text {
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| 348 | my $self = shift(@_);
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| 349 | my ($expat) = @_;
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| 350 | }
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| 351 |
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| 352 | # Called for processing instructions. The $_ variable will contain a copy
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| 353 | # of the pi.
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| 354 | sub xml_pi {
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| 355 | my $self = shift(@_);
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| 356 | my ($expat, $target, $data) = @_;
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| 357 | }
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| 358 |
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| 359 | # Called at the end of the XML document.
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| 360 | sub xml_end_document {
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| 361 | my $self = shift(@_);
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| 362 | my ($expat) = @_;
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| 363 |
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| 364 | $self->close_document();
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| 365 | }
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| 366 |
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| 367 | # Called for any characters not handled by the above functions.
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| 368 | sub xml_default {
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| 369 | my $self = shift(@_);
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| 370 | my ($expat, $text) = @_;
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| 371 | }
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| 372 |
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| 373 | sub open_document {
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| 374 | my $self = shift(@_);
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| 375 |
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| 376 | # create a new document
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| 377 | $self->{'doc_obj'} = new doc ($self->{'filename'}, "indexed_doc");
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| 378 | $self->{'doc_obj'}->set_OIDtype ($self->{'processor'}->{'OIDtype'}, $self->{'processor'}->{'OIDmetadata'});
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| 379 | $self->{'doc_obj'}->add_utf8_metadata($self->{'doc_obj'}->get_top_section(), "Plugin", "$self->{'plugin_type'}");
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| 380 |
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| 381 | # do we want other auto metadata here (see BasePlugin.read_into_doc_obj)
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| 382 | }
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| 383 |
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| 384 | sub close_document {
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| 385 | my $self = shift(@_);
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| 386 | my $doc_obj = $self->{'doc_obj'};
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| 387 |
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| 388 | # do we want other auto stuff here, see BasePlugin.read_into_doc_obj
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| 389 |
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| 390 | # include any metadata passed in from previous plugins
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| 391 | # note that this metadata is associated with the top level section
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| 392 | $self->extra_metadata ($doc_obj,
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| 393 | $doc_obj->get_top_section(),
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| 394 | $self->{'metadata'});
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| 395 |
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| 396 | # do any automatic metadata extraction
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| 397 | $self->auto_extract_metadata ($doc_obj);
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| 398 |
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| 399 | # add an OID
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| 400 | $self->add_OID();
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| 401 |
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| 402 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "Plugin", "$self->{'plugin_type'}");
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| 403 | $doc_obj->add_metadata($doc_obj->get_top_section(), "FileFormat", "XML");
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| 404 |
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| 405 | # process the document
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| 406 | $self->{'processor'}->process($doc_obj);
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| 407 |
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| 408 | $self->{'num_processed'} ++;
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| 409 | undef $self->{'doc_obj'};
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| 410 | undef $doc_obj; # is this the same as above??
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| 411 | }
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| 412 |
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| 413 | 1;
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| 414 |
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| 415 |
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| 416 |
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| 417 |
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