ModeRoot is public and abstract

src/main/java/fr/soleil/archiving/hdbtdb/api/tools/mode/ModeRoot.java

@@ -49,7 +49,7 @@ package fr.soleil.archiving.hdbtdb.api.tools.mode;
  * @see EventMode
  */
 
-class ModeRoot {
+public abstract class ModeRoot {
 
     public static final double SLOW_DRIFT_FIRST_VAL = -99999.99;
     protected int period = 0;