@Override
 public boolean equals(Object obj) {
   if (this == obj) return true;
   if (obj == null) return false;
   if (getClass() != obj.getClass()) return false;
   DockerContainerVolumesCategory other = (DockerContainerVolumesCategory) obj;
   if (container == null) {
     if (other.container != null) return false;
   } else if (!container.equals(other.container)) return false;
   return true;
 }