/**
* Add a new key-id pair.
*
* @param key is the key for which an id is required
* @param id is the requested id that the key is to be mapped to
* @return the new id or 0 if the key is already mapped or the id is already in use or the
* operation fails
*/
public int addPair(long key, int id) {
if (validKey(key) || validId(id)) return 0;
if (!ht.insert(key, id)) return 0;
ids.swap(id);
cnt++;
return id;
}
/**
* Add a new key-id pair.
*
* @param key is the key for which an id is required
* @return the new id or 0 if the key is already mapped or the operation fails
*/
public int addPair(long key) {
if (validKey(key) || (ids.firstOut() == 0)) return 0;
int id = ids.firstOut();
if (!ht.insert(key, id)) return 0;
ids.swap(id);
cnt++;
return id;
}