/**
* Remove a pair from the mapping. This operation removes a (key,id) pair from the mapping.
*
* @param key is the key whose id is to be released
*/
public void dropPair(long key) {
int id = ht.lookup(key);
if (id == 0) return;
ht.remove(key);
ids.swap(id);
cnt--;
}
/**
* Get the id for a given key.
*
* @param key is the key for which the id is required
* @return the corresponding id or 0 if the key is not mapped or the operation fails
*/
public int getId(long key) {
return ht.lookup(key);
}
/**
* Determine if a given key has been mapped to an identfier.
*
* @param key is the key to be checked
* @return true if the key has been mapped, else false
*/
public boolean validKey(long key) {
return (ht.lookup(key) != 0);
}