@Override
 public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((group == null) ? 0 : group.hashCode());
   result = prime * result + ((groupid == null) ? 0 : groupid.hashCode());
   result = prime * result + ((groups == null) ? 0 : groups.hashCode());
   return result;
 }
 @Override
 public boolean equals(Object obj) {
   if (this == obj) return true;
   if (obj == null) return false;
   if (getClass() != obj.getClass()) return false;
   ResultMapper other = (ResultMapper) obj;
   if (group == null) {
     if (other.group != null) return false;
   } else if (!group.equals(other.group)) return false;
   if (groupid == null) {
     if (other.groupid != null) return false;
   } else if (!groupid.equals(other.groupid)) return false;
   if (groups == null) {
     if (other.groups != null) return false;
   } else if (!groups.equals(other.groups)) return false;
   return true;
 }