// Return a map with only keys in the set
public StringDoubleMap restrict(Set<String> set) {
StringDoubleMap newMap = new StringDoubleMap();
newMap.mapType = mapType;
if (mapType == MapType.SORTED_LIST) {
newMap.allocate(getCapacity(num, false));
for (int i = 0; i < keys.length; i++) {
if (set.contains(keys[i])) {
newMap.keys[newMap.num] = keys[i];
newMap.values[newMap.num] = values[i];
newMap.num++;
}
}
} else if (mapType == MapType.HASH_TABLE) {
for (int i = 0; i < keys.length; i++)
if (keys[i] != null && set.contains(keys[i])) newMap.put(keys[i], values[i]);
}
newMap.locked = locked;
return newMap;
}
