@Override
public void hashRow(DimensionSelector dimSelector, Hasher hasher) {
final IndexedInts row = dimSelector.getRow();
final int size = row.size();
// nothing to add to hasher if size == 0, only handle size == 1 and size != 0 cases.
if (size == 1) {
final String value = dimSelector.lookupName(row.get(0));
hasher.putUnencodedChars(nullToSpecial(value));
} else if (size != 0) {
final String[] values = new String[size];
for (int i = 0; i < size; ++i) {
final String value = dimSelector.lookupName(row.get(i));
values[i] = nullToSpecial(value);
}
// Values need to be sorted to ensure consistent multi-value ordering across different
// segments
Arrays.sort(values);
for (int i = 0; i < size; ++i) {
if (i != 0) {
hasher.putChar(CARDINALITY_AGG_SEPARATOR);
}
hasher.putUnencodedChars(values[i]);
}
}
}
@VisibleForTesting
static Sha1HashCode computeAbiKey(ImmutableSortedMap<String, HashCode> classNames) {
Hasher hasher = Hashing.sha1().newHasher();
for (Map.Entry<String, HashCode> entry : classNames.entrySet()) {
hasher.putUnencodedChars(entry.getKey());
hasher.putByte((byte) 0);
hasher.putUnencodedChars(entry.getValue().toString());
hasher.putByte((byte) 0);
}
return Sha1HashCode.fromHashCode(hasher.hash());
}