source: trunk/gsdl/perllib/classify/SectionList.pm@ 5646

###########################################################################
#
# SectionList.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.
#
###########################################################################

# Same as List classifier but includes all sections of document
# (excluding top level) rather than just top level document 
# itself

# 12/05/02 Added usage datastructure - John Thompson

package SectionList;

use List;
use sorttools;

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

my $options = { 'name'     => "SectionList",
        'desc'     => "{SectionList.desc}",
        'inherits' => "Yes" };

#  sub print_usage {
#      print STDERR "
#    usage: classify SectionList [options]
#    options:

#     -metadata X    Metadata field used for classification,
#                    list will be sorted by this element.

#     -buttonname X  (optional) Title field for this classification.
#                    if not included title field will be Metaname. 

#     -sort X        (optional) Sort documents in list by this metadata field.
#                    By default it will sort by Metaname, or (if this is not
#                    set) in build (random) order.

#  Same as List classifier but includes all sections of document
#  (excluding top level) rather than just top level document.
#  ";
#  }

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

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

    return bless $self, $class;
}

sub classify {
    my $self = shift (@_);
    my ($doc_obj, @options) = @_;
    
    my $thissection = undef;

    my $option;
    foreach $option (@options)
    {
    if ($option =~ m/^section=(\d+)$/i) 
    {
        $thissection = $1;
    }
    }

    my $sortmeta = "";
    if (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(),
                               $self->{'sortname'});
        if ($self->{'sortname'} eq "Creator") {
        &sorttools::format_string_name_english (\$sortmeta);
        } else {
        &sorttools::format_string_english (\$sortmeta);
        }
    }
    $sortmeta = "" unless defined $sortmeta;
    }

    if (!defined $thissection)
    {
    $thissection = $doc_obj->get_next_section ($doc_obj->get_top_section());
    while (defined $thissection) {
        $self->classify_section($thissection, $doc_obj, $sortmeta);
        $thissection = $doc_obj->get_next_section ($thissection);
    }
    }
    else
    {
    $self->classify_section($thissection, $doc_obj, $sortmeta);
    }
}

sub classify_section {
    my $self = shift (@_);
    my ($section, $doc_obj, $sortmeta) = @_;

    my $doc_OID = $doc_obj->get_OID();
    $sortmeta = "" unless defined $sortmeta;

    if (defined $self->{'sortname'}) {
    if (defined $self->{'metaname'}) {

        my $metavalue = $doc_obj->get_metadata_element ($section, $self->{'metaname'});
        if (defined $metavalue) {
        if (defined $self->{'list'}->{"$doc_OID.$section"}) {
            my $outhandle = $self->{'outhandle'};
            print $outhandle "WARNING: SectionList::classify called multiple times for $doc_OID.$section\n";
        } 
        $self->{'list'}->{"$doc_OID.$section"} = $sortmeta;
        }
    } else {
        if (defined $self->{'list'}->{"$doc_OID.$section"}) {
        my $outhandle = $self->{'outhandle'};
        print $outhandle "WARNING: SectionList::classify called multiple times for $doc_OID.$section\n";
        } 
        $self->{'list'}->{"$doc_OID.$section"} = $sortmeta;
    }

    } else {
    if (defined $self->{'metaname'}) {

        my $metavalue = $doc_obj->get_metadata_element ($section, $self->{'metaname'});
        if (defined $metavalue) {
        push (@{$self->{'list'}}, "$doc_OID.$section");
        }
    } else {
        push (@{$self->{'list'}}, "$doc_OID.$section");
    }
    }
}

1;