bug6048: implemented new statistic for duration since start to first tack

java/com.sap.sailing.datamining/resources/stringmessages/Sailing_StringMessages.properties

@@ -272,4 +272,5 @@ CompetitorSailingDomainRetrieverChain=Competitors in Leaderboards
 SmoothedSpeed=Smoothed Speed
 RatioDistanceLongVsShortTack=Ratio distance long tack / short tack
 RatioDurationLongVsShortTack=Ratio duration long tack / short tack
-Discarded=Discarded
+Discarded=Discarded
+DurationFromRaceStartToFirstTack=Duration from race start to first tack

java/com.sap.sailing.datamining/resources/stringmessages/Sailing_StringMessages_de.properties

@@ -270,4 +270,5 @@ CompetitorSailingDomainRetrieverChain=Teilnehmer in Ranglisten
 SmoothedSpeed=Geglättete Geschwindigkeit
 RatioDistanceLongVsShortTack=Verhältnis gesegelte Distanz auf Streck- zu Holebug
 RatioDurationLongVsShortTack=Verhältnis gesegelte Dauer auf Streck- zu Holebug
-Discarded=Gestrichen
+Discarded=Gestrichen
+DurationFromRaceStartToFirstTack=Dauer vom Start der Wettfahrt bis zur ersten Wende

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/data/HasRaceOfCompetitorContext.java

@@ -143,6 +143,13 @@ public interface HasRaceOfCompetitorContext {
     @Statistic(messageKey="RaceDuration")
     Duration getDuration();
     
+    /**
+     * The time between the start of the race and the {@link #getCompetitor() competitor}'s first tack;
+     * {@code null} if no tack is found for the competitor in the race.
+     */
+    @Statistic(messageKey="DurationFromRaceStartToFirstTack")
+    Duration getDurationFromStartToFirstTack();
+    
     @Statistic(messageKey="DistanceToStarboardSideAtStartOfRace", resultDecimals=2)
     public Double getRelativeDistanceToStarboardSideAtStartOfRace();
 

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/impl/data/RaceOfCompetitorWithContext.java

@@ -36,6 +36,7 @@ import com.sap.sailing.domain.tracking.TrackedLeg;
 import com.sap.sailing.domain.tracking.TrackedLegOfCompetitor;
 import com.sap.sailing.domain.tracking.TrackedRace;
 import com.sap.sailing.domain.tracking.WindPositionMode;
+import com.sap.sailing.domain.tracking.impl.TimedComparator;
 import com.sap.sse.common.Bearing;
 import com.sap.sse.common.Distance;
 import com.sap.sse.common.Duration;
@@ -399,6 +400,26 @@ public class RaceOfCompetitorWithContext implements HasRaceOfCompetitorContext {
         return duration;
     }
 
+    @Override
+    public Duration getDurationFromStartToFirstTack() {
+        final TrackedRace race = getTrackedRace();
+        final Duration result;
+        if (race.getStartOfRace() == null) {
+            result = null;
+        } else {
+            final Iterable<Maneuver> maneuvers = race.getManeuvers(competitor, /* wait for latest */ false);
+            final List<Maneuver> tacks = Util.asList(Util.filter(maneuvers,
+                    m->m.getType() == ManeuverType.TACK && !m.getTimePoint().before(race.getStartOfRace())));
+            if (tacks.isEmpty()) {
+                result = null;
+            } else {
+                tacks.sort(TimedComparator.INSTANCE);
+                result = race.getStartOfRace().until(tacks.get(0).getTimePoint());
+            }
+        }
+        return result;
+    }
+
     @Override
     public Double getRelativeDistanceToStarboardSideAtStartOfRace() {
         TrackedRace trackedRace = getTrackedRace();