@Override
      public String toString() {
        return "AnnotatorStatistics{" +
               "annotator=" + annotator +
               ", annotatorStartStamp=" + annotatorStartStamp +
               ", firstAnnotationStamp=" + firstAnnotationStamp +
               ", firstAnnotation=" + firstAnnotation +
               ", lastAnnotationStamp=" + lastAnnotationStamp +
               ", lastAnnotation=" + lastAnnotation +
               ", annotatorFinishStamp=" + annotatorFinishStamp +
               '}';
      }
@Override
      public String toString()