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# Copyright © 1998 Richard Braakman
# Copyright © 1999 Darren Benham
# Copyright © 2000 Sean 'Shaleh' Perry
# Copyright © 2004 Frank Lichtenheld
# Copyright © 2006 Russ Allbery
# Copyright © 2007-2009 Raphaël Hertzog <hertzog@debian.org>
# Copyright © 2008-2009, 2012-2014 Guillem Jover <guillem@debian.org>
#
# This program is free software; you may 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 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, see <https://www.gnu.org/licenses/>.
package Dpkg::Deps::Union;
=encoding utf8
=head1 NAME
Dpkg::Deps::Union - list of unrelated dependencies
=head1 DESCRIPTION
This class represents a list of relationships.
It inherits from Dpkg::Deps::Multiple.
=cut
use strict;
use warnings;
our $VERSION = '1.00';
use parent qw(Dpkg::Deps::Multiple);
=head1 METHODS
=over 4
=item $dep->output([$fh])
The output method uses ", " to join the list of relationships.
=cut
sub output {
my ($self, $fh) = @_;
my $res = join(', ', map {
$_->output()
} grep {
not $_->is_empty()
} $self->get_deps());
if (defined $fh) {
print { $fh } $res;
}
return $res;
}
=item $dep->implies($other_dep)
=item $dep->get_evaluation($other_dep)
These methods are not meaningful for this object and always return undef.
=cut
sub implies {
# Implication test is not useful on Union.
return;
}
sub get_evaluation {
# Evaluation is not useful on Union.
return;
}
=item $dep->simplify_deps($facts)
The simplification is done to generate an union of all the relationships.
It uses $simple_dep->merge_union($other_dep) to get its job done.
=cut
sub simplify_deps {
my ($self, $facts) = @_;
my @new;
WHILELOOP:
while (@{$self->{list}}) {
my $odep = shift @{$self->{list}};
foreach my $dep (@new) {
next WHILELOOP if $dep->merge_union($odep);
}
push @new, $odep;
}
$self->{list} = [ @new ];
}
=back
=head1 CHANGES
=head2 Version 1.00 (dpkg 1.15.6)
Mark the module as public.
=cut
1;
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