1 files changed, 90 insertions, 0 deletions
diff --git a/lib/ManaTools/Shared/disk_backend/PurposeLabelRole.pm b/lib/ManaTools/Shared/disk_backend/PurposeLabelRole.pm
new file mode 100644
index 00000000..bf7db326
--- /dev/null
+++ b/lib/ManaTools/Shared/disk_backend/PurposeLabelRole.pm
@@ -0,0 +1,90 @@
+# vim: set et ts=4 sw=4:
+package ManaTools::Shared::disk_backend::PurposeLabelRole;
+
+#============================================================= -*-perl-*-
+
+=head1 NAME
+
+    ManaTools::Shared::disk_backend::PurposeLabelRole - a PurposeLabelRole Moose Role
+
+=head1 SYNOPSIS
+    package Foo;
+
+    with 'ManaTools::Shared::disk_backend::PurposeLabelRole';
+
+    1;
+
+    ...
+
+    my $f = Foo->new();
+    $f->prop('dev', 'maj:min');
+    $f->sync_majorminor();
+    my $major = $f->major();
+    my $minor = $f->minor();
+
+
+=head1 DESCRIPTION
+
+    This Role is an collection of PurposeLabelRole in the backend to manadisk
+
+=head1 SUPPORT
+
+    You can find documentation for this Role with the perldoc command:
+
+    perldoc ManaTools::Shared::disk_backend::PurposeLabelRole
+
+
+=head1 AUTHOR
+
+    Maarten Vanraes <alien@rmail.be>
+
+=head1 COPYRIGHT and LICENSE
+
+Copyright (c) 2015 Maarten Vanraes <alien@rmail.be>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License version 2, as
+published by the Free Software Foundation.
+
+This program 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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+=head1 METHODS
+
+=cut
+
+use Moose::Role;
+
+#=============================================================
+
+=head2 purpose_label
+
+=head3 DESCRIPTION
+
+    this method finds in descendants the label denoting the purpose
+
+=cut
+
+#=============================================================
+sub purpose_label {
+    my $self = shift;
+    my $partstate = shift;
+    # finding a purpose label if one has overridden the purpose_label or has a PurposeLabelRole child
+    my @labels = ();
+    my @children = $self->children($partstate);
+    for my $child (@children) {
+        my $label = $child->purpose_label($partstate) if ($child->does('ManaTools::Shared::disk_backend::PurposeLabelRole'));
+        push @labels, $label if defined($label);
+    }
+    return undef if scalar(@labels) == 0;
+    @labels = sort @labels;
+    return $labels[0];
+}
+
+1;