added closing event for open ended device mappings

java/com.sap.sailing.domain.common/src/com/sap/sailing/domain/common/TimeRange.java

@@ -3,8 +3,14 @@ package com.sap.sailing.domain.common;
 import java.io.Serializable;
 
 public interface TimeRange extends Comparable<TimeRange>, Serializable {
+    /**
+     * @return {@code null}, if the timepoint is at the beginning of time
+     */
     TimePoint from();
     
+    /**
+     * @return {@code null}, if the timepoint is at the beginning of time
+     */
     TimePoint to();
     
     /**

java/com.sap.sailing.domain.common/src/com/sap/sailing/domain/common/impl/TimeRangeImpl.java

@@ -16,7 +16,7 @@ public class TimeRangeImpl extends Pair<TimePoint, TimePoint> implements TimeRan
 
     @Override
     public int compareTo(TimeRange other) {
-        if (other.from() == from() && other.to() == to()) return 0;
+        if (other.from().equals(from()) && other.to().equals(to())) return 0;
         return startsBefore(other) ? -1 : 1;
     }