source: trunk/gsdl/perllib/classify/AutoHierarchy.pm@ 8728

###########################################################################
#
# AutoHierarchy.pm --classifier to create a Hierarchy without the need for a 
#  hierarchy file (like Hierarchy)
# created by Imene, modified by Katherine
# 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.
#
###########################################################################

# simple Hierarchical classifier plugin 
# to see the options, run "perl -S classinfo.pl AutoHierarchy"

package AutoHierarchy;

use BasClas;
use sorttools;

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

my $arguments = 
    [ { 'name' => "metadata",
    'desc' => "{AZCompactList.metadata}",
    'type' => "metadata",
    'reqd' => "yes" },
      { 'name' => "firstvalueonly",
    'desc' => "{AZCompactList.firstvalueonly}",
    'type' => "flag",
    'reqd' => "no" },
      { 'name' => "allvalues",
    'desc' => "{AZCompactList.allvalues}",
    'type' => "flag",
    'reqd' => "no" },
      { 'name' => "buttonname",
    'desc' => "{BasClas.buttonname}",
    'type' => "string",
    'deft' => "{BasClas.metadata.deft}",
    'reqd' => "no" },
      { 'name' => "sort",
    'desc' => "{Hierarchy.sort}",
    'type' => "string",
    'deft' => "{BasClas.metadata.deft}",
    'reqd' => "no" },
      { 'name' => "separator",
    'desc' => "{AutoHierarchy.separator}",
    'type' => "regexp",
    'deft' => "[\\\\\\\/]",
    'reqd' => "no" },
      { 'name' => "suppresslastlevel",
    'desc' => "{AutoHierarchy.suppresslastlevel}",
    'type' => "flag",
    'reqd' => "no" }
      ];

my $options = { 'name'     => "AutoHierarchy",
        'desc'     => "{AutoHierarchy.desc}",
        'abstract' => "no",
        'inherits' => "yes",
        'args'     => $arguments };


sub new {
    my $class = shift (@_);
    my $self = new BasClas($class, @_);

    # 14-05-02 To allow for proper inheritance of arguments - John Thompson
    my $option_list = $self->{'option_list'};
    push( @{$option_list}, $options );

    if ($self->{'info_only'}) {
    # created from classinfo.pl - don't need to parse the arguments
    return bless $self, $class;
    }

    my ($metadata, $buttonname, $sortname, $separator);
    my $firstvalueonly = 0;
    my $allvalues = 0;

    if (!parsargv::parse(\@_, 
             q^metadata/.*/^, \$metadata,
             q^buttonname/.*/^, \$buttonname,
             q^sort/.*/^, \$sortname,
             q^separator/.*/^, \$separator,
             q^firstvalueonly^, \$firstvalueonly,
             q^allvalues^, \$allvalues,

             "allow_extra_options")) {
    
    print STDERR "\nIncorrect options passed to $class, check your collect.cfg file\n";
    $self->print_txt_usage("");  # Use default resource bundle
    die "\n";
    }

    if (!$metadata) {
    print STDERR "$class Error: required option -metadata not supplied\n";
    $self->print_txt_usage("");  # Use default resource bundle
    
    die "$class Error: required option -metadata not supplied\n";
    }
    my @meta_list = split(/,/, $metadata);
    $self->{'meta_list'} = \@meta_list;
    
    if (!$separator) {
    $separator = "[\\\/]";
    }
    $self->{'separator'} = $separator;

    $buttonname = $self->generate_title_from_metadata($metadata) unless ($buttonname);
    $self->{'title'} = $buttonname;

    if ($firstvalueonly != 0) {
    $firstvalueonly = 1;
    }
    $self->{'firstvalueonly'} = $firstvalueonly;
  
    if ($allvalues != 0) {
    $allvalues = 1;
    }
    $self->{'allvalues'} = $allvalues;

    $self->{'uniquelastbit'} = 1;
    # sortname is handled a bit differently - kjdon
    # undef means to sort, but use the metadata value from -metadata
    # because there is no one metadata value to get for sorting when 
    # we have a list of possible metadata
    # to get no sorting, set sortname = 'nosort'
    if (!$sortname) {
    if (defined ($metadata)) {
        $sortname = undef;
    } else {
        $sortname = "nosort";
    }
    }
    $self->{'sortname'} = $sortname;
    
    # the hash that we use to build up the hierarchy
    $self->{'path_hash'}={};
    
    return bless $self, $class;
}

sub init {
    my $self = shift (@_);
    
}

sub classify {
    my $self = shift (@_);
    my ($doc_obj) = @_;

    my $doc_OID = $doc_obj->get_OID();

    # are we sorting the list??
    my $nosort = 0;
    if (defined $self->{'sortname'} && $self->{'sortname'} eq "nosort") {
    $nosort = 1;
    }

    my $metavalues = [];
    # find all the metadata values
    foreach $m (@{$self->{'meta_list'}}) {
    my $mvalues = $doc_obj->get_metadata($doc_obj->get_top_section(), $m);
    next unless (@{$mvalues});
    if ($self->{'onlyfirst'}) {
        # we only want the first metadata value
        push (@$metavalues, $mvalues[0]);
        last;
    }
    push (@$metavalues, @$mvalues);
    last if (!$self->{'allvalues'}); # we don't want to try other elements
                                     # cos we have already found some 
    } 
    
    return unless (@$metavalues);
    
    #check for a sort element other than our metadata
    my $sortmeta = undef;
    if (!$nosort && defined $self->{'sortname'}) {
        
    if ($self->{'sortname'} =~ /^filename$/i) {
        $sortmeta = $doc_obj->get_source_filename();
    } else {
        $sortmeta = $doc_obj->get_metadata_element($doc_obj->get_top_section(), $self->{'sortname'});
        if (defined $sortmeta) {
        $sortmeta = $self->format_metadata_for_sorting($self->{'sortname'}, $sortmeta, $doc_obj);
        }
    }
    $sortmeta = "" unless defined $sortmeta;
    }

    
    #Add all the metadata values to the hash
    my $path_hash;
    my $current_pos;
    
    foreach $metavalue (@$metavalues) {
    $path_hash = $self->{'path_hash'};
    my @chunks = split (/$self->{'separator'}/, $metavalue);
    if ($self->{'uniquelastbit'}) {
        pop(@chunks); # remove the last element from the end
    }
    
    foreach $folderName (@chunks) 
    {
        if ($folderName ne ""){ #sometimes the tokens are empty
        $current_pos = $self->add_To_Hash($path_hash, $folderName, $nosort);
        $path_hash = $current_pos->{'nodes'};
        } 
    }
    # now add the document, with sort meta if needed
    if ($nosort) {
        push(@{$current_pos->{'docs'}}, $doc_OID);
    } else {
        if (defined $sortmeta) {
        # can you ever get the same doc twice in one classification??
        $current_pos->{'docs'}->{$doc_OID} = $sortmeta;
        } else {
        $current_pos->{'docs'}->{$doc_OID} = $metavalue;
        }
    }
    } # foreach metadata
}

sub add_To_Hash {
    my $self = shift (@_);
    my ($myhash, $k, $nosort) = @_;
    
    if (!defined $myhash->{$k}){
    $myhash->{$k}={};
    $myhash->{$k}->{'nodes'}={};
    if ($nosort) {
        $myhash->{$k}->{'docs'}=[];
    } else {
        $myhash->{$k}->{'docs'} = {};
    }
    }
    return $myhash->{$k}; 
}

sub print_Hash{
    my $self = shift (@_); 
    my ($myHash, $num_spaces) = @_;

    foreach my $key (keys %{$myHash}){
    print "\n";
    $self->print_spaces($num_spaces);
    print STDERR "$key*";
    $self->print_Hash($myHash->{$key}, $num_spaces + 2);
    }    
}

sub print_spaces{
    my $self = shift (@_);
    my ($num_spaces) = @_;
    
    for ($i = 0; $i < $num_spaces; $i++){
    print STDERR " ";
    }
}

sub get_entry {
    my $self = shift (@_);
    my ($title, $childtype, $thistype) = @_;
    
    # organise into classification structure
    my %classifyinfo = ('childtype'=>$childtype,
            'Title'=>$title,
            'contains'=>[],);
    $classifyinfo{'thistype'} = $thistype 
    if defined $thistype && $thistype =~ /\w/;
    
    return \%classifyinfo;
}

sub process_hash {
    my $self = shift (@_);
    my ($top_hash, $top_entry) = @_;   
    my ($entry);
    
    my $hash = {};
    foreach my $key (sort keys %{$top_hash}) {
    $entry = $self->get_entry($key,"VList","VList");
    my $has_content = 0;
    my @doc_list;
    # generate a sorted list of doc ids
    if ($nosort && scalar(@{$top_hash->{$key}->{'docs'}})) {
        @doc_list = @{$top_hash->{$key}->{'docs'}};
    } elsif (!$nosort && (keys %{$top_hash->{$key}->{'docs'}})) {
        @doc_list = sort {$top_hash->{$key}->{'docs'}->{$a} 
                  cmp $top_hash->{$key}->{'docs'}->{$b};} keys %{$top_hash->{$key}->{'docs'}};
        
    }
    # if this key has documents, add them
    if (@doc_list) {
        $has_content = 1;
        foreach $d(@doc_list) {
        push (@{$entry->{'contains'}}, {'OID'=>$d});
        }    
    }
    # if this key has nodes, add them
    if (scalar(keys %{$top_hash->{$key}->{'nodes'}})) {
        $has_content = 1;
        $self->process_hash($top_hash->{$key}->{'nodes'}, $entry); 
    }
    # if we have found some content, add the new entry for this key into the parent node
    if ($has_content) {
        push (@{$top_entry->{'contains'}}, $entry);
    }

    }    
}

sub get_classify_info {
    my $self = shift (@_);
    my ($no_thistype) = @_;
    $no_thistype = 0 unless defined $no_thistype;

    my ($classification);
    my $top_h = $self->{'path_hash'};

    if ($self->{'path_hash'}) {
    $classification = $self->get_entry ($self->{'title'}, "VList", "Invisible");
    }

    $self->process_hash($top_h, $classification);
   
    return  $classification;

}


1;