# Copyright (c) 2006 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: LogicalOpBase.pm,v 1.4 2008/04/29 21:44:44 nagler Exp $
package Bivio::UI::Widget::LogicalOpBase;
use strict;
use Bivio::Base 'UI.Widget';

our($VERSION) = sprintf('%d.%02d', q$Revision: 1.4 $ =~ /\d+/g);

sub initialize {
    my($self) = @_;
    my($name) = 0;
    foreach my $v (@{$self->get('values')}) {
	$self->initialize_value($name++, $v);
    }
    return;
}

sub internal_new_args {
    my(undef, @values) = @_;
    return {values => \@values};
}

sub internal_render_end {
    return;
}

sub internal_render_start {
    return;
}

sub internal_render_true {
    my($self, $state, $value) = @_;
    ${$state->{buffer}} .= $value;
    return 0;
}

sub render {
    my($self, $source, $buffer) = @_;
    my($state) = {
	source => $source,
	buffer => $buffer,
    };
    $self->internal_render_start($state);
    my($last_value);
    foreach my $v (@{$self->get('values')}) {
	return unless $self->internal_render_operand(
	    $last_value = $self->render_simple_value($v, $source),
	    $state,
	);
    }
    $self->internal_render_end($state, $last_value);
    return;
}

1;