@Override
 public boolean equals(Object obj) {
   if (this == obj) return true;
   if (obj == null) return false;
   if (getClass() != obj.getClass()) return false;
   CoverageDimensionImpl other = (CoverageDimensionImpl) obj;
   if (description == null) {
     if (other.description != null) return false;
   } else if (!description.equals(other.description)) return false;
   if (dimensionType == null) {
     if (other.dimensionType != null) return false;
   } else if (!dimensionType.equals(other.dimensionType)) return false;
   if (id == null) {
     if (other.id != null) return false;
   } else if (!id.equals(other.id)) return false;
   if (name == null) {
     if (other.name != null) return false;
   } else if (!name.equals(other.name)) return false;
   if (nullValues == null) {
     if (other.nullValues != null) return false;
   } else if (!nullValues.equals(other.nullValues)) return false;
   if (range == null) {
     if (other.range != null) return false;
   } else if (!range.equals(other.range)) return false;
   if (unit == null) {
     if (other.unit != null) return false;
   } else if (!unit.equals(other.unit)) return false;
   return true;
 }