@Override
 public boolean equalToReference(T2 candidate) {
   comparator2.extractKeys(candidate, candidateKeyFields, 0);
   for (int i = 0; i < this.comparators1.length; i++) {
     if (this.comparators1[i].compare(referenceKeyFields[i], candidateKeyFields[i]) != 0) {
       return false;
     }
   }
   return true;
 }
 @Override
 public int compareToReference(T2 candidate) {
   comparator2.extractKeys(candidate, candidateKeyFields, 0);
   for (int i = 0; i < this.comparators1.length; i++) {
     // We reverse ordering here because our "compareToReference" does work in a mirrored
     // way compared to Comparable.compareTo
     int res = this.comparators1[i].compare(candidateKeyFields[i], referenceKeyFields[i]);
     if (res != 0) {
       return res;
     }
   }
   return 0;
 }
 @Override
 public void setReference(T1 reference) {
   comparator1.extractKeys(reference, referenceKeyFields, 0);
 }