added before/after/plus to TimePoint/AbstractTimePoint

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

@@ -7,4 +7,10 @@ public interface TimePoint extends Comparable<TimePoint>, Serializable {
     long asMillis();
 
     Date asDate();
+    
+    TimePoint plus(long milliseconds);
+    
+    boolean after(TimePoint other);
+    
+    boolean before(TimePoint other);
 }

java/com.sap.sailing.domain/src/com/sap/sailing/domain/base/impl/AbstractTimePoint.java

@@ -37,6 +37,21 @@ public abstract class AbstractTimePoint implements TimePoint {
         return result;
     }
     
+    @Override
+    public TimePoint plus(long milliseconds) {
+        return new MillisecondsTimePoint(asMillis()+milliseconds);
+    }
+
+    @Override
+    public boolean after(TimePoint other) {
+        return this.compareTo(other) > 0;
+    }
+
+    @Override
+    public boolean before(TimePoint other) {
+        return this.compareTo(other) < 0;
+    }
+
     @Override
     public int hashCode() {
         return (int) (asMillis() & Integer.MAX_VALUE);