# Copyright (c) 2008 bivio Software, Inc.  All Rights Reserved.
#
# Visit http://www.bivio.biz for more info.
# 
# This library is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of the
# License, or (at your option) any later version.
# 
# This library 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
# Lesser General Public License for more details.
# 
# You should have received a copy of the GNU Lesser General Public
# License along with this library;  If not, you may get a copy from:
# http://www.opensource.org/licenses/lgpl-license.html
# 
# $Id: Exists.pm,v 1.1 2008/02/26 10:05:37 nagler Exp $
package Bivio::UI::Widget::Exists;
use strict;
use Bivio::Base 'UI.Widget';

our($VERSION) = sprintf('%d.%02d', q$Revision: 1.1 $ =~ /\d+/g);

sub initialize {
    my($self) = @_;
    $self->die('value', undef, 'attribute must be an array_ref')
	unless ref($self->initialize_attr('value')) eq 'ARRAY';
    return;
}

sub internal_new_args {
    my(undef, $value, $attributes) = @_;
    return {
	value => $value,
	($attributes ? %$attributes : ()),
    };
}

sub render {
    my($self, $source, $buffer) = @_;
    $$buffer .= '1'
	if defined($source->unsafe_get_nested(@{$self->get('value')}));
    return;
}

1;