# 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: Registrar.pm,v 1.4 2009/04/24 12:55:58 nagler Exp $
package Bivio::Biz::Registrar;
use strict;
use Bivio::Base 'Bivio::UNIVERSAL';

our($VERSION) = sprintf('%d.%02d', q$Revision: 1.4 $ =~ /\d+/g);
my($_IDI) = __PACKAGE__->instance_data_index;

sub call_fifo {
    my($self, $method, $args) = @_;
    my($q) = $self->[$_IDI];
    $args ||= [];
    return [map(
	!$_->can($method) ? ()
	    : $_->$method(ref($args) eq 'CODE' ? @{$args->()} : @$args),
	@$q,
    )];
}

sub do_filo {
    my($self, $method, $args) = @_;
    $args ||= [];
    foreach my $h (reverse(@{$self->[$_IDI]})) {
	next
	    unless $h->can($method);
	my($res) = $h->$method(ref($args) eq 'CODE' ? @{$args->()} : @$args);
	return $res
	    if defined($res);
    }
    return;
}

sub new {
    my($self) = shift->SUPER::new;
    $self->[$_IDI] = [];
    return $self;
}

sub push_object {
    my($self, $object) = @_;
    $object = b_use($object)
	unless ref($object);
    my($q) = $self->[$_IDI];
    push(@$q, $object)
	unless grep($_ eq $object, @$q);
    return;
}

1;