source: trunk/gsdl/perllib/docsave.pm@ 7645

###########################################################################
#
# docsave.pm
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the 
# University of Waikato, New Zealand.
#
# Copyright (C) 1999 New Zealand Digital Library Project
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
###########################################################################

# This document processor saves a document in the 
# archives directory of a collection (as xml)


package docsave;

eval {require bytes};

use arcinfo;
use docproc;
use util;


sub BEGIN {
    @ISA = ('docproc');
}

sub new {
    my ($class, $collection, $archive_info, $verbosity, 
    $gzip, $groupsize, $outhandle) = @_;
    my $self = new docproc ();
    
    
    $groupsize=1 unless defined $groupsize;
    $self->{'collection'} = $collection;
    $self->{'archive_info'} = $archive_info;
    $self->{'verbosity'} = $verbosity;
    $self->{'gzip'} = $gzip;
    
    $self->{'groupsize'} = $groupsize;
    $self->{'gs_count'} = 0;

    $self->{'outhandle'} = STDERR;
    $self->{'outhandle'} = $outhandle if defined $outhandle;
    # set a default for the archive directory
    $self->{'archive_dir'} = &util::filename_cat ($ENV{'GSDLCOLLECTDIR'}, "archives");
    
    $self->{'sortmeta'} = undef;
    
    return bless $self, $class;
}

sub setarchivedir {
    my $self = shift (@_);
    my ($archive_dir) = @_;
    
    &util::mk_all_dir ($archive_dir) unless -e $archive_dir;
    $self->{'archive_dir'} = $archive_dir;
}

sub set_sortmeta {
    my $self = shift (@_);
    my ($sortmeta) = @_;
    
    $self->{'sortmeta'} = $sortmeta;
}

sub process {
    my $self = shift (@_);
    my ($doc_obj) = @_;
 
    my $outhandle = $self->{'outhandle'};
   
    if ($self->{'groupsize'} > 1) {
    $self->group_process ($doc_obj);
    
    } else {
    # groupsize is 1 (i.e. one document per XML file) so sortmeta 
    # may be used
    
    my $OID = $doc_obj->get_OID();
    $OID = "NULL" unless defined $OID;
    
    # get document's directory
    my $doc_dir = $self->get_doc_dir ($OID);
    
    # copy all the associated files, add this information as metadata
    # to the document
    $self->process_assoc_files ($doc_obj, $doc_dir);
    
    my $doc_file 
        = &util::filename_cat ($self->{'archive_dir'}, $doc_dir, "doc.xml");
    my $short_doc_file = &util::filename_cat ($doc_dir, "doc.xml");
    
    if (!open (OUTDOC, ">$doc_file")) {
        print $outhandle "docsave::process could not write to file $doc_file\n";
        return;
    }

    # save this document
    $self->output_xml_header('docsave::OUTDOC');
    $doc_obj->output_section('docsave::OUTDOC', $doc_obj->get_top_section());
    $self->output_xml_footer('docsave::OUTDOC');
    close OUTDOC;

    if ($self->{'gzip'}) {
        my $doc_file = $self->{'gs_filename'};
        `gzip $doc_file`;
        $doc_file .= ".gz";
        $short_doc_file .= ".gz";
        if (!-e $doc_file) {
        print $outhandle "error while gzipping: $doc_file doesn't exist\n";
        return 0;
        }
    }

    # do the sortmeta thing
    my ($metadata);
    if (defined ($self->{'sortmeta'})) {
        $metadata = $doc_obj->get_metadata_element ($doc_obj->get_top_section(), $self->{'sortmeta'});
    }

    # store reference in the archive_info
    $self->{'archive_info'}->add_info($OID, $short_doc_file, $metadata);
    }
}

sub group_process {
    my $self = shift (@_);
    my ($doc_obj) = @_;
    
    my $outhandle = $self->{'outhandle'};

    my $OID = $doc_obj->get_OID();
    $OID = "NULL" unless defined $OID;

    my $groupsize = $self->{'groupsize'};
    my $gs_count = $self->{'gs_count'};
    my $open_new_file = (($gs_count % $groupsize)==0);

    # opening a new file, or document has assoicated files => directory needed
    if (($open_new_file) || (scalar(@{$doc_obj->get_assoc_files()})>0)) {

    # get document's directory
    my $doc_dir = $self->get_doc_dir ($OID);

    # copy all the associated files, add this information as metadata
    # to the document
    $self->process_assoc_files ($doc_obj, $doc_dir);


    if ($open_new_file) {
        # only if opening new file
        my $doc_file 
        = &util::filename_cat ($self->{'archive_dir'}, $doc_dir, "doc.xml");
        my $short_doc_file = &util::filename_cat ($doc_dir, "doc.xml");
        
        if ($gs_count>0)
        {
        return if (!$self->close_file_output());
        }
        
        if (!open (OUTDOC, ">$doc_file")) {
        print $outhandle "docsave::group_process could not write to file $doc_file\n";
        return;
        }
        $self->{'gs_filename'} = $doc_file;
        $self->{'gs_short_filename'} = $short_doc_file;
        $self->{'gs_OID'} = $OID;

        $self->output_xml_header('docsave::OUTDOC');
    }
    }

    # save this document
    $doc_obj->output_section('docsave::OUTDOC', $doc_obj->get_top_section());

    $self->{'gs_count'}++;
}


sub get_doc_dir {
    my $self = shift (@_);
    my ($OID) = @_;

    my $doc_info = $self->{'archive_info'}->get_info($OID);
    my $doc_dir = "";
    if (defined $doc_info && scalar(@$doc_info) >= 1) {
    # this OID already has an assigned directory, use the
    # same one.
    $doc_dir = $doc_info->[0];
    $doc_dir =~ s/\/?doc\.xml(\.gz)?$//;
    } else {
    # have to get a new document directory
    my $doc_dir_rest = $OID;
    my $doc_dir_num = 0;
    do {
        $doc_dir .= "/" if $doc_dir_num > 0;
        if ($doc_dir_rest =~ s/^(.{1,8})//) {
        $doc_dir .= $1;
        $doc_dir_num++;
        }
    } while ($doc_dir_rest ne "" && 
         ((-d &util::filename_cat ($self->{'archive_dir'}, "$doc_dir.dir")) || 
          ($self->{'archive_info'}->size() >= 1024 && $doc_dir_num < 2)));
    $doc_dir .= ".dir";
    
    }
    
    &util::mk_all_dir (&util::filename_cat ($self->{'archive_dir'}, $doc_dir));

    return $doc_dir;
}


sub process_assoc_files {
    my $self = shift (@_);
    my ($doc_obj, $doc_dir) = @_;

    my $outhandle = $self->{'outhandle'};

    my @assoc_files = ();
    foreach $assoc_file (@{$doc_obj->get_assoc_files()}) {
    my ($dir, $afile) = $assoc_file->[1] =~ /^(.*?)([^\/\\]+)$/;
    $dir = "" unless defined $dir;
    if (-e $assoc_file->[0]) {
        my $filepath = &util::filename_cat($self->{'archive_dir'}, $doc_dir, $afile);
        &util::hard_link ($assoc_file->[0], $filepath);
        $doc_obj->add_utf8_metadata ($doc_obj->get_top_section(),
                     "gsdlassocfile",
                     "$afile:$assoc_file->[2]:$dir");
        $doc_obj->set_utf8_metadata_element ($doc_obj->get_top_section(),
                         "assocfilepath",
                         "$doc_dir");
    } elsif ($self->{'verbosity'} > 2) {
        print $outhandle "docsave::process couldn't copy the associated file " .
        "$assoc_file->[0] to $afile\n";
    }
    }
}
    

sub close_file_output
{
    my ($self) = @_;

    # make sure that the handle has been opened - it won't be if we failed
    # to import any documents...
    if (defined(fileno(docsave::OUTDOC))) {
    $self->output_xml_footer('docsave::OUTDOC');    
    close OUTDOC;
    }

    my $OID = $self->{'gs_OID'};
    my $short_doc_file = $self->{'gs_short_filename'};

    if ($self->{'gzip'}) {
    my $doc_file = $self->{'gs_filename'};
    `gzip $doc_file`;
    $doc_file .= ".gz";
    $short_doc_file .= ".gz";
    if (!-e $doc_file) {
        my $outhandle = $self->{'outhandle'};
        print $outhandle "error while gzipping: $doc_file doesn't exist\n";
        return 0;
    }
    }

    # store reference in the archive_info
    $self->{'archive_info'}->add_info($OID, $short_doc_file);

    return 1;
}

sub output_xml_header {
    my $self = shift (@_);
    my ($handle) = @_;

    print $handle '<?xml version="1.0" encoding="UTF-8" standalone="no"?>' . "\n";
    print $handle '<!DOCTYPE Archive SYSTEM "http://greenstone.org/dtd/Archive/1.0/Archive.dtd">' . "\n";
    print $handle "<Archive>\n";
}

sub output_xml_footer {
    my $self = shift (@_);
    my ($handle) = @_;

    print $handle "</Archive>\n";
}

1;