source: gsdl/trunk/bin/script/explode_metadata_database.pl@ 18301

#!/usr/bin/perl -w


BEGIN {
    die "GSDLHOME not set\n" unless defined $ENV{'GSDLHOME'};
    unshift (@INC, "$ENV{'GSDLHOME'}/perllib");
    unshift (@INC, "$ENV{'GSDLHOME'}/perllib/plugins");
}

use strict;
no strict 'subs'; # allow barewords (eg STDERR) as function arguments
no strict 'refs'; # allow filehandles to be variables and vice versa

use encodings;
use printusage;
use parse2;
use colcfg;

use FileHandle;

use File::Spec;
use File::Basename;

my $unicode_list =
    [ { 'name' => "auto",
    'desc' => "{ReadTextFile.input_encoding.auto}" },
      { 'name' => "ascii",
    'desc' => "{BasePlugin.encoding.ascii}" },
      { 'name' => "utf8",
    'desc' => "{BasePlugin.encoding.utf8}" },
      { 'name' => "unicode",
    'desc' => "{BasePlugin.encoding.unicode}" } ];

my $e = $encodings::encodings;
foreach my $enc (sort {$e->{$a}->{'name'} cmp $e->{$b}->{'name'}} keys (%$e)) 
{
    my $hashEncode =
    {'name' => $enc,
     'desc' => $e->{$enc}->{'name'}};
    
    push(@{$unicode_list},$hashEncode);
}

my $arguments = 
    [ 
      { 'name' => "language",
    'desc' => "{scripts.language}",
    'type' => "string",
    'reqd' => "no",
        'hiddengli' => "yes" },
      { 'name' => "plugin",
    'desc' => "{explode.plugin}",
    'type' => "string",
    'reqd' => "yes",
    'hiddengli' => "yes"},
      { 'name' => "input_encoding",
    'desc' => "{explode.encoding}",
    'type' => "enum",
    'deft' => "auto",
    'list' => $unicode_list,
    'reqd' => "no" },
      { 'name' => "metadata_set",
    'desc' => "{explode.metadata_set}",
    'type' => "string",
    'reqd' => "no" },
      { 'name' => "document_field",
    'desc' => "{explode.document_field}",
    'type' => "string",
    'reqd' => "no"},
       { 'name' => "document_prefix",
    'desc' => "{explode.document_prefix}",
    'type' => "string",
    'reqd' => "no"},
      { 'name' => "document_suffix",
    'desc' => "{explode.document_suffix}",
    'type' => "string",
    'reqd' => "no"},
      { 'name' => "records_per_folder",
    'desc' => "{explode.records_per_folder}",
    'type' => "int",
    'range' => "0,",
    'deft' => "100",
    'reqd' => "no" },
      { 'name' => "plugin_options",
    'desc' => "{explode.plugin_options}",
    'type' => "string",
    'reqd' => "no",
    'modegli' => "3"},
      { 'name' => "collection",
    'desc' => "{explode.collection}",
    'type' => "string",
    'reqd' => "no",
    'hiddengli' => "yes"},
      { 'name' => "verbosity",
    'desc' => "{import.verbosity}",
    'type' => "int",
    'range' => "0,",
    'deft' => "1",
    'reqd' => "no",
    'modegli' => "4" },
      { 'name' => "xml",
    'desc' => "",
    'type' => "flag",
    'reqd' => "no",
    'hiddengli' => "yes" }
      ];
    
my $options = { 'name' => "explode_metadata_database.pl",
        'desc' => "{explode.desc}",
        'args' => $arguments };



sub main
{
    my ($language, $input_encoding, $metadata_set, $plugin, 
    $document_field, $document_prefix, $document_suffix, $records_per_folder, $plugin_options, $collection, $verbosity);

    my $xml = 0;

    my $hashParsingResult = {};
    # parse the options
    my $intArgLeftinAfterParsing = parse2::parse(\@ARGV,$arguments,$hashParsingResult,"allow_extra_options");

    # If parse returns -1 then something has gone wrong
    if ($intArgLeftinAfterParsing == -1)
    {
    &PrintUsage::print_txt_usage($options, "{explode.params}");
    die "\n";
    }

    foreach my $strVariable (keys %$hashParsingResult)
    {
    eval "\$$strVariable = \$hashParsingResult->{\"\$strVariable\"}";
    }

    # If $language has been specified, load the appropriate resource bundle
    # (Otherwise, the default resource bundle will be loaded automatically)
    if ($language && $language =~ /\S/) {
    &gsprintf::load_language_specific_resource_bundle($language);
    }

    if ($xml) {
        &PrintUsage::print_xml_usage($options);
    print "\n";
    return;
    }

    
    # There should one arg left after parsing (the filename)
    # Or the user may have specified -h, in which case we output the usage
    if($intArgLeftinAfterParsing != 1 || (@ARGV && $ARGV[0] =~ /^\-+h/))
    {
    &PrintUsage::print_txt_usage($options, "{explode.params}");
    die "\n";
    }

    # The metadata database filename is the first value that remains after the options have been parsed out
    my $filename = $ARGV[0];
    if (!defined $filename || $filename !~ /\w/) { 
    &PrintUsage::print_txt_usage($options, "{explode.params}");
    print STDERR "You need to specify a filename";
    die "\n";
    }
    # check that file exists
    if (!-e $filename) {
    print STDERR "File $filename doesn't exist...\n";
    die "\n";
    }
    # check required options
    if (!defined $plugin || $plugin !~ /\w/) {
    &PrintUsage::print_txt_usage($options, "{explode.params}");
    print STDERR "You need to specify a plugin";
    die "\n";
    }
    
    # check metadata set
    if (defined $metadata_set && $metadata_set =~ /\w/) {
    $metadata_set .= ".";
    } else {
    $metadata_set = "";
    }
    if (defined $collection && $collection =~ /\w/) {
    if (($collection = &colcfg::use_collection("", $collection, "")) eq "") {
        print STDERR "Collection $collection does not exist\n";
        die "\n";
    }
    }
    
    my $plugobj;
    require "$plugin.pm";

    if (defined $plugin_options && $plugin_options =~ /\w/) {
    my @options = split(/\s/, $plugin_options);
    map { $_ = "\"$_\"" unless $_ =~ /^\"/; } @options;
    $plugin_options = join (",", @options);
    eval ("\$plugobj = new $plugin([], [$plugin_options])");
    die "$@" if $@;
    } else {
    eval ("\$plugobj = new $plugin()");
    die "$@" if $@;
    }
    # ...and initialize it
    $plugobj->init($verbosity, "STDERR", "STDERR");

    if ($input_encoding eq "auto") {
    ($language, $input_encoding) = $plugobj->textcat_get_language_encoding ($filename);
    }       

    # Create a directory to store the document files...
    my ($exploded_base_dir) = ($filename =~ /(.*)\.[^\.]+$/);

    my $orig_base_dir = &File::Basename::dirname($filename);


    my $split_exp = $plugobj->{'split_exp'};
    if (defined $split_exp) {
    # Read in file, and then split and process individual records

    my $text = "";
    # Use the plugin's read_file function to avoid duplicating code
    $plugobj->read_file($filename, $input_encoding, undef, \$text);
    # is there any text in the file??
    die "\n" unless length($text);

    # Split the text into records, using the plugin's split_exp

    my @metadata_records = split(/$split_exp/, $text);
    my $total_num_records = scalar(@metadata_records);
    print STDERR "Number of records: $total_num_records\n";
    
    # Write the metadata from each record to the metadata.xml file
    my $record_number = 1;
    my $documents_directory;
    foreach my $record_text (@metadata_records) {
        
        # Check if we need to start a new directory for these records
        check_need_new_directory($exploded_base_dir,$record_number,
                     $records_per_folder,$total_num_records,
                     \$documents_directory);
        # Use the plugin's process function to avoid duplicating code
        my $doc_obj = new doc($filename, "nonindexed_doc");
        $plugobj->process(\$record_text, undef, undef, $filename, undef, $doc_obj, 0);
        
        
        # Try to get a doc to attach the metadata to
        # If no match found, create a dummy .nul file
        attach_metadata_or_make_nul_doc($document_field, $doc_obj, $record_number,
                       $documents_directory, $orig_base_dir,
                       $document_prefix, $document_suffix, $metadata_set, $verbosity);
                
        
        check_close_directory($record_number,$records_per_folder,$total_num_records);
        
        $record_number = $record_number + 1;
    }
    }
    else {
    # Call metadata_read to set up associated metadata 

    my $pluginfo = undef;
    my $block_hash = {};

    my $processor = undef;
    my $maxdocs = undef;
    my $gli = undef;

    my $extrametakeys = [];
    my $extrametadata = {};


    $plugobj->metadata_read($pluginfo, "", $filename, $block_hash,   
                $extrametakeys, $extrametadata, $processor, $maxdocs, $gli);

    my $total_num_records = scalar (@$extrametakeys);
    print STDERR "Number of records: $total_num_records\n";
    my $record_number = 1;
    my $documents_directory;
    foreach my $record (@$extrametakeys) {
        &check_need_new_directory($exploded_base_dir, $record_number, $records_per_folder, $total_num_records, \$documents_directory);
        
        # Attach metadata to object
        # => use the plugin's extra_metadata function to avoid duplicating code
        my $doc_obj = new doc($filename, "nonindexed_doc");
        # all the metadata has been extracted into extrametadata
        $plugobj->extra_metadata ($doc_obj, $doc_obj->get_top_section(), $extrametadata->{$record});

        # Try to get a doc to attach the metadata to
        # If no match found, create a dummy .nul file
        attach_metadata_or_make_nul_doc($document_field, $doc_obj, $record_number, $documents_directory, $orig_base_dir, $document_prefix, $document_suffix, $metadata_set, $verbosity);
        
        &check_close_directory($record_number,$records_per_folder,$total_num_records);
        
        $record_number = $record_number + 1;

    }
    }

    # Explode means just that: the original file is deleted
    &util::rm($filename);
    $plugobj->clean_up_after_exploding();

}


sub need_new_directory
{
    my ($exploded_base_dir) = @_;
    
    my $documents_directory = $exploded_base_dir;

    if (-d $documents_directory) {
    die "Error: document directory $documents_directory already exists (bailing).\n";
    }
    &util::mk_dir($documents_directory);

    my $documents_metadata_xml_file = &util::filename_cat($documents_directory, "metadata.xml");
    if (-e $documents_metadata_xml_file) {
    die "Error: documents metadata.xml file $documents_metadata_xml_file already exists (bailing).\n";
    }

    # Start the metadata.xml file
    open(METADATA_XML_FILE, ">$documents_metadata_xml_file");
    print METADATA_XML_FILE
    "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n" .
    "<!DOCTYPE DirectoryMetadata SYSTEM \"http://greenstone.org/dtd/DirectoryMetadata/1.0/DirectoryMetadata.dtd\">\n" .
    "<DirectoryMetadata>\n";

    return $documents_directory;
}

sub check_need_new_directory
{
    my ($exploded_base_dir,$record_number, $records_per_folder,
    $total_num_records, $documents_dir_ref) = @_;
    

    # Check if we need to start a new directory for these records
    if (($record_number % $records_per_folder) == 1) {
    my $documents_directory = $exploded_base_dir;

    if ($total_num_records > $records_per_folder) {
        $documents_directory .= "." . sprintf("%8.8d", $record_number);
    }

    $$documents_dir_ref = need_new_directory($documents_directory);
    }
}





sub attach_metadata_or_make_nul_doc
{
    my ($document_field, $doc_obj, $record_number, 
    $documents_directory, $orig_base_dir,
    $document_prefix, $document_suffix, $metadata_set, $verbosity) = @_;

    my $record_metadata = $doc_obj->get_all_metadata($doc_obj->get_top_section());
    my $document_file;

    # try to get a doc to attach the metadata to
    if (defined $document_field) {
    foreach my $pair (@$record_metadata) {
        my ($field, $value) = (@$pair);

        $value =~ s/\\\\/\\/g;
        
        # Does this metadata element specify a document to obtain?
        if ($field eq $document_field) {
        my $document_file_full = $document_prefix . $value . $document_suffix;

        # this either downloads/copies the document, or creates a nul file for it.
        $document_file = &obtain_document($document_file_full, $documents_directory, $orig_base_dir, $verbosity);
        &write_metadata_xml_file_entry(METADATA_XML_FILE, $document_file, $record_metadata, $metadata_set);
        }
    }
    }
    
    # Create a dummy .nul file if we haven't obtained a document (or null file) for this record
    if (not defined $document_file) {

    if (defined ($record_number)) {
        $document_file = sprintf("%8.8d", $record_number) . ".nul";
    }
    else {
        $document_file = "doc.nul";
    }
    open(DUMMY_FILE, ">$documents_directory/$document_file");
    close(DUMMY_FILE);
    &write_metadata_xml_file_entry(METADATA_XML_FILE, $document_file, $record_metadata, $metadata_set);
    }

}

sub close_directory
{
    # Finish and close the metadata.xml file
    print METADATA_XML_FILE "\n</DirectoryMetadata>\n";
    close(METADATA_XML_FILE);

}


sub check_close_directory
{
    my ($record_number,$records_per_folder,$total_num_records) = @_;

    if (($record_number % $records_per_folder) == 0 || $record_number == $total_num_records) {
    # Finish and close the metadata.xml file
    close_directory();
    }
}
        


sub write_metadata_xml_file_entry
{
    my $metadata_xml_file = shift(@_);
    my $file_name = shift(@_);
    my $record_metadata = shift(@_);
    my $meta_prefix = shift(@_);
    
    # Make $file_name XML-safe
    $file_name =~ s/&/&amp;/g;
    $file_name =~ s/</&lt;/g;
    $file_name =~ s/>/&gt;/g;

    # Convert $file_name into a regular expression that matches it
    $file_name =~ s/\./\\\./g;
    $file_name =~ s/\(/\\\(/g;
    $file_name =~ s/\)/\\\)/g;
    $file_name =~ s/\{/\\\{/g;
    $file_name =~ s/\}/\\\}/g;
    $file_name =~ s/\[/\\\[/g;
    $file_name =~ s/\]/\\\]/g;
    
    print $metadata_xml_file
    "\n" .
        "  <FileSet>\n" .
    "    <FileName>$file_name</FileName>\n" .
    "    <Description>\n";

    foreach my $pair (@$record_metadata) {
    my ($field, $value) = (@$pair);

    # We're only interested in metadata from the database
    next if ($field eq "lastmodified");
    next if ($field eq "gsdlsourcefilename");
    next if ($field eq "gsdldoctype");
    next if ($field eq "FileFormat");

    # Ignore the ^all metadata, since it will be invalid if the source metadata is changed
    next if ($field =~ /\^all$/);  # ISISPlug specific!

    # Square brackets in metadata values need to be escaped so they don't confuse Greenstone/GLI
    $value =~ s/\[/&\#091;/g;
    $value =~ s/\]/&\#093;/g;

    # Make $value XML-safe
    $value =~ s/&/&amp;/g;  # May mess up existing entities!
    $value =~ s/</&lt;/g;
    $value =~ s/>/&gt;/g;

    # we are not allowed & in xml except in entities. 
    # if there are undefined entities then parsing will also crap out.
    # should we be checking for them too?
    # this may not get all possibilities
    # $value =~ s/&([^;\s]*(\s|$))/&amp;$1/g;

    # do we already have a namespace specified?
    my $full_field = $field;
    if ($meta_prefix ne "") {
        $full_field =~ s/^\w+\.//;
        $full_field = $meta_prefix.$full_field;
    }

    print $metadata_xml_file "      <Metadata mode=\"accumulate\" name=\"$full_field\">$value</Metadata>\n";
    }

    print $metadata_xml_file
    "    </Description>\n" .
        "  </FileSet>\n";
}

sub obtain_document
{
    my ($document_file_full,$documents_directory,$orig_base_dir,$verbosity) = @_;
    
    print STDERR "Obtaining document file $document_file_full...\n" if ($verbosity > 1);

    my $document_file_name;
    my $local_document_file;

    # Document specified is on the web
    if ($document_file_full =~ /^https?:/ || $document_file_full =~ /^ftp:/) {
    $document_file_full =~ /([^\/]+)$/;
    $document_file_name = $1;
    $local_document_file = &util::filename_cat($documents_directory, $document_file_name);

    my $wget_options = "--quiet";
    $wget_options = "--verbose" if ($verbosity > 2);
    $wget_options .= " --timestamping";  # Only re-download files if they're newer
    my $wget_command = "wget $wget_options \"$document_file_full\" --output-document \"$local_document_file\"";
    `$wget_command`;

    # Check the document was obtained successfully
    if (!-e $local_document_file) {
        print STDERR "WARNING: Could not obtain document file $document_file_full\n";
    }
    }
    # Document specified is on the disk
    else {
    my $dir_sep = &util::get_os_dirsep();

    $document_file_full =~ m/(.+$dir_sep)?(.*)$/;
    $document_file_name = $2;


    my $is_absolute = File::Spec->file_name_is_absolute($document_file_full);
    print STDERR "doc file full = $document_file_full\n";

    if (!$is_absolute) {
        $document_file_full 
        = &util::filename_cat($orig_base_dir,$document_file_full);
    }

    $local_document_file = &util::filename_cat($documents_directory, $document_file_name);

    if (-e $document_file_full) {
        &util::cp($document_file_full, $documents_directory);
    }
    
    # Check the document was obtained successfully
    if (!-e $local_document_file) {
        print STDERR "WARNING: Could not obtain document file $document_file_full\n";
    }
    else {
        $orig_base_dir =~ s/\\/\\\\/g; # escape windows style slashes for the regex below
        if ($document_file_full =~ m/^$orig_base_dir.*/) {
        # file local to metadata record
        # => copy has been made successfully, so remove original
        &util::rm($document_file_full);
        }
    }
    }

    # If the document wasn't obtained successfully, create a .nul file for it
    if (!-e $local_document_file) {
    $document_file_name .= ".nul";
    open(NULL_FILE, ">$local_document_file.nul");
    close(NULL_FILE);
    print STDERR "Creating a nul document $document_file_name\n";
    }

    return $document_file_name;
}

&main(@ARGV);