public void preSaveInit(){
  persistentData.clear();
  for (  DataPoint point : vectorToTokenDict.asArrayList()) {
    persistentData.add((StringDataPoint)point);
  }
}

public void preSaveInit ( ) { persistentData . clear ( ) ; for ( DataPoint point : vectorToTokenDict . asArrayList ( ) ) { persistentData . add ( ( StringDataPoint ) point ) ; } }
initializes persistent data . initializes dataset from persistent data .
