@Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("[ ");
    for (String label : labels) {
      sb.append(label);
      sb.append(' ');
    }
    sb.append(']');
    return sb.toString();
  }
This class contains visibility labels associated with a Scan/Get deciding which all labeled data
current scan/get can access.
hbase-client/src/main/java/org/apache/hadoop/hbase/security/visibility/Authorizations.java