@Override
 public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((generated == null) ? 0 : generated.hashCode());
   result = prime * result + ((parent == null) ? 0 : parent.hashCode());
   result = prime * result + ((precompiled == null) ? 0 : precompiled.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;
   ClassSet other = (ClassSet) obj;
   if (generated == null) {
     if (other.generated != null) return false;
   } else if (!generated.equals(other.generated)) return false;
   if (parent == null) {
     if (other.parent != null) return false;
   } else if (!parent.equals(other.parent)) return false;
   if (precompiled == null) {
     if (other.precompiled != null) return false;
   } else if (!precompiled.equals(other.precompiled)) return false;
   return true;
 }