added operation to track an event

java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/TrackEvent.java

@@ -0,0 +1,35 @@
+package com.sap.sailing.server.operationaltransformation;
+
+import com.sap.sailing.domain.base.Event;
+import com.sap.sailing.domain.common.EventIdentifier;
+import com.sap.sailing.server.RacingEventService;
+
+public class TrackEvent extends AbstractRacingEventServiceOperation {
+    private static final long serialVersionUID = 7891960455598410633L;
+    private final EventIdentifier eventIdentifier;
+    
+    public TrackEvent(EventIdentifier eventIdentifier) {
+        super();
+        this.eventIdentifier = eventIdentifier;
+    }
+    
+    @Override
+    public RacingEventServiceOperation transformClientOp(RacingEventServiceOperation serverOp) {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public RacingEventServiceOperation transformServerOp(RacingEventServiceOperation clientOp) {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public RacingEventService applyTo(RacingEventService toState) {
+        Event event = toState.getEvent(eventIdentifier);
+        toState.getOrCreateTrackedEvent(event);
+        return toState;
+    }
+
+}