From 65bc835d4495503a806c9cbe322b3d6725af0abd Mon Sep 17 00:00:00 2001
From: Moritz Bunkus <m.bunkus@linet-services.de>
Date: Mon, 1 Nov 2010 18:37:48 +0100
Subject: [PATCH] Hilfsroutinen zum Umrechnen zwischen Einheiten

---
 SL/DB/Unit.pm | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/SL/DB/Unit.pm b/SL/DB/Unit.pm
index 6a197337c..55a190b24 100644
--- a/SL/DB/Unit.pm
+++ b/SL/DB/Unit.pm
@@ -38,4 +38,23 @@ sub convertible_units {
   ];
 }
 
+sub base_factor {
+  my ($self) = @_;
+
+  if (!defined $self->{__base_factor}) {
+    $self->{__base_factor} = !$self->base_unit || !$self->factor || ($self->name eq $self->base_unit) ? 1 : $self->factor * $self->base->base_factor;
+  }
+
+  return $self->{__base_factor};
+}
+
+sub convert_to {
+  my ($self, $qty, $other_unit) = @_;
+
+  my $my_base_factor    = $self->base_factor       || 1;
+  my $other_base_factor = $other_unit->base_factor || 1;
+
+  return $qty * $my_base_factor / $other_base_factor;
+}
+
 1;
-- 
2.20.1