# Copyright (c) 1999-2001 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: TypeValue.pm,v 2.5 2011/08/15 18:19:37 moeller Exp $
package Bivio::TypeValue;
use strict;
use Bivio::Base 'Collection.Attributes';

# Binds a type and a value.  Convenient for parameter passing.

our($VERSION) = sprintf('%d.%02d', q$Revision: 2.5 $ =~ /\d+/g);

sub as_string {
    my($self) = @_;
    my($t) = $self->get('type');
    my($v) = $self->get('value');
    return (ref($t) || $t)
	. '['
	. join(',', map($t->to_string($_), ref($v) eq 'ARRAY' ? @$v : $v))
	. ']';
}

sub equals {
    my($self, $that) = @_;
    return defined($that)
	&& ref($self) eq ref($that)
	&& $self->get('type') eq $that->get('type')
	&& $self->get('type')->is_equal(
	    $self->get('value'), $that->get('value')) ? 1 : 0;
}

sub new {
    my($proto, $type, $value) = @_;
    Bivio::Die->die($type, ': not a type')
	unless UNIVERSAL::isa($type, 'Bivio::Type');
    return $proto->SUPER::new({
	type => $type,
	value => $value,
    });
}

1;