From f0fba026a14cbee4af4d033244237d257aeaa15c Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Fri, 17 Jan 2014 23:42:04 +0100
Subject: Only do DateTime math when needed (makes code ~2x as fast)

---
 lib/Travel/Status/DE/URA.pm        | 17 ++++++-----------
 lib/Travel/Status/DE/URA/Result.pm | 35 ++++++++++++++++++++++++++++++++---
 2 files changed, 38 insertions(+), 14 deletions(-)

diff --git a/lib/Travel/Status/DE/URA.pm b/lib/Travel/Status/DE/URA.pm
index f48d7eb..71981c6 100644
--- a/lib/Travel/Status/DE/URA.pm
+++ b/lib/Travel/Status/DE/URA.pm
@@ -202,16 +202,11 @@ sub results {
 		push(
 			@results,
 			Travel::Status::DE::URA::Result->new(
-				date        => $dt_dep->strftime('%d.%m.%Y'),
-				time        => $dt_dep->strftime('%H:%M:%S'),
-				datetime    => $dt_dep,
-				line        => $linename,
-				line_id     => $lineid,
-				destination => decode( 'UTF-8', $dest ),
-				countdown =>
-				  $dt_dep->subtract_datetime($dt_now)->in_units('minutes'),
-				countdown_sec =>
-				  $dt_dep->subtract_datetime($dt_now)->in_units('seconds'),
+				datetime        => $dt_dep,
+				dt_now          => $dt_now,
+				line            => $linename,
+				line_id         => $lineid,
+				destination     => decode( 'UTF-8', $dest ),
 				route_timetable => [@route],
 				stop            => $stopname,
 				stop_id         => $stopid,
@@ -221,7 +216,7 @@ sub results {
 
 	@results = map { $_->[0] }
 	  sort { $a->[1] <=> $b->[1] }
-	  map { [ $_, $_->countdown ] } @results;
+	  map { [ $_, $_->datetime->epoch ] } @results;
 
 	$self->{results} = \@results;
 
diff --git a/lib/Travel/Status/DE/URA/Result.pm b/lib/Travel/Status/DE/URA/Result.pm
index bb1c0a9..e8cb1e8 100644
--- a/lib/Travel/Status/DE/URA/Result.pm
+++ b/lib/Travel/Status/DE/URA/Result.pm
@@ -9,9 +9,7 @@ use parent 'Class::Accessor';
 our $VERSION = '0.02';
 
 Travel::Status::DE::URA::Result->mk_ro_accessors(
-	qw(countdown countdown_sec date datetime destination line line_id
-	  stop stop_id time)
-);
+	qw(datetime destination line line_id stop stop_id));
 
 sub new {
 	my ( $obj, %conf ) = @_;
@@ -21,6 +19,37 @@ sub new {
 	return bless( $ref, $obj );
 }
 
+sub countdown {
+	my ($self) = @_;
+
+	$self->{countdown} //= $self->datetime->subtract_datetime( $self->{dt_now} )
+	  ->in_units('minutes');
+
+	return $self->{countdown};
+}
+
+sub countdown_sec {
+	my ($self) = @_;
+
+	$self->{countdown_sec}
+	  //= $self->datetime->subtract_datetime( $self->{dt_now} )
+	  ->in_units('seconds');
+
+	return $self->{countdown_sec};
+}
+
+sub date {
+	my ($self) = @_;
+
+	return $self->datetime->strftime('%d.%m.%Y');
+}
+
+sub time {
+	my ($self) = @_;
+
+	return $self->datetime->strftime('%H:%M:%S');
+}
+
 sub route_timetable {
 	my ($self) = @_;
 
-- 
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