###########################################################################
#
# ExcelPlug.pm -- plugin for importing Microsoft Excel files.
#  (currently only versions 95 and 97)
#
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the 
# University of Waikato, New Zealand.
#
# Copyright (C) 2002 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.
#
###########################################################################

package ExcelPlug;

use ConvertToPlug;

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

my $arguments = 
    [ { 'name' => "process_exp",
	'desc' => "{BasPlug.process_exp}",
	'type' => "regexp",
	'reqd' => "no",
	'deft' => &get_default_process_exp() }
      ];

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

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

    my $self = new ConvertToPlug ($class, @_);
    $self->{'plugin_type'} = "ExcelPlug";
# I'm not sure what encoding xlhtml produces - I think it puts it
# into the Content-Type meta tag in the header of the HTML file.

#    if ($self->{'input_encoding'} eq "auto") {
#	$self->{'input_encoding'} = "utf8";
#    }

    # 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 get_default_process_exp {
    my $self = shift (@_);
    return q^(?i)\.xls$^;
}
    
sub process {
    my $self = shift (@_);

    my $outhandle = $self->{'outhandle'};
    print $outhandle "ExcelPlug: passing $_[3] on to $self->{'converted_to'}Plug\n"
	if $self->{'verbosity'} > 1;
    print STDERR "<Processing n='$_[3]' p='ExcelPlug'>\n" if ($_[6]);

    return ConvertToPlug::process_type($self,"xls",@_);
}

1;
